4.0 head on a 4.2 questions
08-04-2005, 07:10 PM
#11
Guest
Posts: n/a
Re: 4.0 head on a 4.2 questions
Well.... it is a shaky conversion. You have to rely on glue or JB Weld
to seal up big voids in the water jacket....
Not for me thanks.
And yes, if you get everything from one donor vehicle, you shouldn't
have issues.
The problem is all the folks that do the FI conversion only boast about
a 25% boost in power with a drop in gas mileage. Well you get that for
free by just killing the computer via a Nutter bypass and as a bonus,
you get an 'increase' in gas mileage.....
All the 4.0's that wheel with me and my BBD 'nuttered' carb engine burn
a lot more gas than me on the same trails....
I always get a nice 23 mpg loaded on the highway and my CJ7 goes like a
scalded cat. It will spin up my 33's too easy in first with 3.31 gears
even, 2nd hits 50+ mph at 4400 rpm, 3rd pulls fast to 75 mph, 4 buries
the speedo and I have 'no' freakin' urge to find out how fast 5th
goes....
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Ervin Charles wrote:
>
> JoBo,
> If I am taking the head, manifold. computer and all components from the
> same Cherokee wouldn't that remove the risk of mismatching components?
> And Thanks for your response, I thought with all these jeep guys, more would
> have chimed in.
> Charles
> "Jo Bo" <jromasSPAM@columbus.rr.com> wrote in message
> news:JrmIe.61983$yC5.38078@tornado.ohiordc.rr.com. ..
> > Be advised the Cherokees have two totally different computer systems with
> > different heads and manifolds. As I recall there's even differences in
> > different years of the "HO" heads.
> >
> > JoBo
> >
> > "Ervin Charles" <charleserv@charter.net> wrote in message
> > news:PKbIe.3223$c45.1774@fe05.lga...
> >> Hey guys,
> >> I've read Tim Weaver's excellent article on installing a 4.0 head on a
> >> 4.2 block ( http://monsterslayer.com/jeep/40Head/40Head.htm ) and am
> >> preparing to do the same to my 84 CJ7. I'm wondering if anyone in this
> >> group has swapped a factory Cherokee 4.0 fuel injection system into an
> >> earlier model vehicle. I know I'm going to need the wiring harness, the
> >> computer (ECM), as well as the manifold with the MAF, Temp sensor, TPS,
> >> etc., etc.. Other than installing an O2 sensor in the exhaust is there
> >> anything I'm overlooking? I will not be running a catalytic converter.
> >> This seems to be a pretty heads up swap and I really would like to avoid
> >> a $2,000.00 bill for a fuel injection system.
> >> While I'm at it I'll probably change the ignition to the later model
> >> computer controlled ignition.
> >> Any and all input is greatly appreciated.
> >> Thanks,
> >> Charles E.
> >> 84 CJ7
> >> 92 Cherokee
> >> 81 DJ5L
> >>
> >
> >
to seal up big voids in the water jacket....
Not for me thanks.
And yes, if you get everything from one donor vehicle, you shouldn't
have issues.
The problem is all the folks that do the FI conversion only boast about
a 25% boost in power with a drop in gas mileage. Well you get that for
free by just killing the computer via a Nutter bypass and as a bonus,
you get an 'increase' in gas mileage.....
All the 4.0's that wheel with me and my BBD 'nuttered' carb engine burn
a lot more gas than me on the same trails....
I always get a nice 23 mpg loaded on the highway and my CJ7 goes like a
scalded cat. It will spin up my 33's too easy in first with 3.31 gears
even, 2nd hits 50+ mph at 4400 rpm, 3rd pulls fast to 75 mph, 4 buries
the speedo and I have 'no' freakin' urge to find out how fast 5th
goes....
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Ervin Charles wrote:
>
> JoBo,
> If I am taking the head, manifold. computer and all components from the
> same Cherokee wouldn't that remove the risk of mismatching components?
> And Thanks for your response, I thought with all these jeep guys, more would
> have chimed in.
> Charles
> "Jo Bo" <jromasSPAM@columbus.rr.com> wrote in message
> news:JrmIe.61983$yC5.38078@tornado.ohiordc.rr.com. ..
> > Be advised the Cherokees have two totally different computer systems with
> > different heads and manifolds. As I recall there's even differences in
> > different years of the "HO" heads.
> >
> > JoBo
> >
> > "Ervin Charles" <charleserv@charter.net> wrote in message
> > news:PKbIe.3223$c45.1774@fe05.lga...
> >> Hey guys,
> >> I've read Tim Weaver's excellent article on installing a 4.0 head on a
> >> 4.2 block ( http://monsterslayer.com/jeep/40Head/40Head.htm ) and am
> >> preparing to do the same to my 84 CJ7. I'm wondering if anyone in this
> >> group has swapped a factory Cherokee 4.0 fuel injection system into an
> >> earlier model vehicle. I know I'm going to need the wiring harness, the
> >> computer (ECM), as well as the manifold with the MAF, Temp sensor, TPS,
> >> etc., etc.. Other than installing an O2 sensor in the exhaust is there
> >> anything I'm overlooking? I will not be running a catalytic converter.
> >> This seems to be a pretty heads up swap and I really would like to avoid
> >> a $2,000.00 bill for a fuel injection system.
> >> While I'm at it I'll probably change the ignition to the later model
> >> computer controlled ignition.
> >> Any and all input is greatly appreciated.
> >> Thanks,
> >> Charles E.
> >> 84 CJ7
> >> 92 Cherokee
> >> 81 DJ5L
> >>
> >
> >
08-04-2005, 07:10 PM
#12
Guest
Posts: n/a
Re: 4.0 head on a 4.2 questions
Well.... it is a shaky conversion. You have to rely on glue or JB Weld
to seal up big voids in the water jacket....
Not for me thanks.
And yes, if you get everything from one donor vehicle, you shouldn't
have issues.
The problem is all the folks that do the FI conversion only boast about
a 25% boost in power with a drop in gas mileage. Well you get that for
free by just killing the computer via a Nutter bypass and as a bonus,
you get an 'increase' in gas mileage.....
All the 4.0's that wheel with me and my BBD 'nuttered' carb engine burn
a lot more gas than me on the same trails....
I always get a nice 23 mpg loaded on the highway and my CJ7 goes like a
scalded cat. It will spin up my 33's too easy in first with 3.31 gears
even, 2nd hits 50+ mph at 4400 rpm, 3rd pulls fast to 75 mph, 4 buries
the speedo and I have 'no' freakin' urge to find out how fast 5th
goes....
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Ervin Charles wrote:
>
> JoBo,
> If I am taking the head, manifold. computer and all components from the
> same Cherokee wouldn't that remove the risk of mismatching components?
> And Thanks for your response, I thought with all these jeep guys, more would
> have chimed in.
> Charles
> "Jo Bo" <jromasSPAM@columbus.rr.com> wrote in message
> news:JrmIe.61983$yC5.38078@tornado.ohiordc.rr.com. ..
> > Be advised the Cherokees have two totally different computer systems with
> > different heads and manifolds. As I recall there's even differences in
> > different years of the "HO" heads.
> >
> > JoBo
> >
> > "Ervin Charles" <charleserv@charter.net> wrote in message
> > news:PKbIe.3223$c45.1774@fe05.lga...
> >> Hey guys,
> >> I've read Tim Weaver's excellent article on installing a 4.0 head on a
> >> 4.2 block ( http://monsterslayer.com/jeep/40Head/40Head.htm ) and am
> >> preparing to do the same to my 84 CJ7. I'm wondering if anyone in this
> >> group has swapped a factory Cherokee 4.0 fuel injection system into an
> >> earlier model vehicle. I know I'm going to need the wiring harness, the
> >> computer (ECM), as well as the manifold with the MAF, Temp sensor, TPS,
> >> etc., etc.. Other than installing an O2 sensor in the exhaust is there
> >> anything I'm overlooking? I will not be running a catalytic converter.
> >> This seems to be a pretty heads up swap and I really would like to avoid
> >> a $2,000.00 bill for a fuel injection system.
> >> While I'm at it I'll probably change the ignition to the later model
> >> computer controlled ignition.
> >> Any and all input is greatly appreciated.
> >> Thanks,
> >> Charles E.
> >> 84 CJ7
> >> 92 Cherokee
> >> 81 DJ5L
> >>
> >
> >
to seal up big voids in the water jacket....
Not for me thanks.
And yes, if you get everything from one donor vehicle, you shouldn't
have issues.
The problem is all the folks that do the FI conversion only boast about
a 25% boost in power with a drop in gas mileage. Well you get that for
free by just killing the computer via a Nutter bypass and as a bonus,
you get an 'increase' in gas mileage.....
All the 4.0's that wheel with me and my BBD 'nuttered' carb engine burn
a lot more gas than me on the same trails....
I always get a nice 23 mpg loaded on the highway and my CJ7 goes like a
scalded cat. It will spin up my 33's too easy in first with 3.31 gears
even, 2nd hits 50+ mph at 4400 rpm, 3rd pulls fast to 75 mph, 4 buries
the speedo and I have 'no' freakin' urge to find out how fast 5th
goes....
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Ervin Charles wrote:
>
> JoBo,
> If I am taking the head, manifold. computer and all components from the
> same Cherokee wouldn't that remove the risk of mismatching components?
> And Thanks for your response, I thought with all these jeep guys, more would
> have chimed in.
> Charles
> "Jo Bo" <jromasSPAM@columbus.rr.com> wrote in message
> news:JrmIe.61983$yC5.38078@tornado.ohiordc.rr.com. ..
> > Be advised the Cherokees have two totally different computer systems with
> > different heads and manifolds. As I recall there's even differences in
> > different years of the "HO" heads.
> >
> > JoBo
> >
> > "Ervin Charles" <charleserv@charter.net> wrote in message
> > news:PKbIe.3223$c45.1774@fe05.lga...
> >> Hey guys,
> >> I've read Tim Weaver's excellent article on installing a 4.0 head on a
> >> 4.2 block ( http://monsterslayer.com/jeep/40Head/40Head.htm ) and am
> >> preparing to do the same to my 84 CJ7. I'm wondering if anyone in this
> >> group has swapped a factory Cherokee 4.0 fuel injection system into an
> >> earlier model vehicle. I know I'm going to need the wiring harness, the
> >> computer (ECM), as well as the manifold with the MAF, Temp sensor, TPS,
> >> etc., etc.. Other than installing an O2 sensor in the exhaust is there
> >> anything I'm overlooking? I will not be running a catalytic converter.
> >> This seems to be a pretty heads up swap and I really would like to avoid
> >> a $2,000.00 bill for a fuel injection system.
> >> While I'm at it I'll probably change the ignition to the later model
> >> computer controlled ignition.
> >> Any and all input is greatly appreciated.
> >> Thanks,
> >> Charles E.
> >> 84 CJ7
> >> 92 Cherokee
> >> 81 DJ5L
> >>
> >
> >
08-04-2005, 07:10 PM
#13
Guest
Posts: n/a
Re: 4.0 head on a 4.2 questions
Well.... it is a shaky conversion. You have to rely on glue or JB Weld
to seal up big voids in the water jacket....
Not for me thanks.
And yes, if you get everything from one donor vehicle, you shouldn't
have issues.
The problem is all the folks that do the FI conversion only boast about
a 25% boost in power with a drop in gas mileage. Well you get that for
free by just killing the computer via a Nutter bypass and as a bonus,
you get an 'increase' in gas mileage.....
All the 4.0's that wheel with me and my BBD 'nuttered' carb engine burn
a lot more gas than me on the same trails....
I always get a nice 23 mpg loaded on the highway and my CJ7 goes like a
scalded cat. It will spin up my 33's too easy in first with 3.31 gears
even, 2nd hits 50+ mph at 4400 rpm, 3rd pulls fast to 75 mph, 4 buries
the speedo and I have 'no' freakin' urge to find out how fast 5th
goes....
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Ervin Charles wrote:
>
> JoBo,
> If I am taking the head, manifold. computer and all components from the
> same Cherokee wouldn't that remove the risk of mismatching components?
> And Thanks for your response, I thought with all these jeep guys, more would
> have chimed in.
> Charles
> "Jo Bo" <jromasSPAM@columbus.rr.com> wrote in message
> news:JrmIe.61983$yC5.38078@tornado.ohiordc.rr.com. ..
> > Be advised the Cherokees have two totally different computer systems with
> > different heads and manifolds. As I recall there's even differences in
> > different years of the "HO" heads.
> >
> > JoBo
> >
> > "Ervin Charles" <charleserv@charter.net> wrote in message
> > news:PKbIe.3223$c45.1774@fe05.lga...
> >> Hey guys,
> >> I've read Tim Weaver's excellent article on installing a 4.0 head on a
> >> 4.2 block ( http://monsterslayer.com/jeep/40Head/40Head.htm ) and am
> >> preparing to do the same to my 84 CJ7. I'm wondering if anyone in this
> >> group has swapped a factory Cherokee 4.0 fuel injection system into an
> >> earlier model vehicle. I know I'm going to need the wiring harness, the
> >> computer (ECM), as well as the manifold with the MAF, Temp sensor, TPS,
> >> etc., etc.. Other than installing an O2 sensor in the exhaust is there
> >> anything I'm overlooking? I will not be running a catalytic converter.
> >> This seems to be a pretty heads up swap and I really would like to avoid
> >> a $2,000.00 bill for a fuel injection system.
> >> While I'm at it I'll probably change the ignition to the later model
> >> computer controlled ignition.
> >> Any and all input is greatly appreciated.
> >> Thanks,
> >> Charles E.
> >> 84 CJ7
> >> 92 Cherokee
> >> 81 DJ5L
> >>
> >
> >
to seal up big voids in the water jacket....
Not for me thanks.
And yes, if you get everything from one donor vehicle, you shouldn't
have issues.
The problem is all the folks that do the FI conversion only boast about
a 25% boost in power with a drop in gas mileage. Well you get that for
free by just killing the computer via a Nutter bypass and as a bonus,
you get an 'increase' in gas mileage.....
All the 4.0's that wheel with me and my BBD 'nuttered' carb engine burn
a lot more gas than me on the same trails....
I always get a nice 23 mpg loaded on the highway and my CJ7 goes like a
scalded cat. It will spin up my 33's too easy in first with 3.31 gears
even, 2nd hits 50+ mph at 4400 rpm, 3rd pulls fast to 75 mph, 4 buries
the speedo and I have 'no' freakin' urge to find out how fast 5th
goes....
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Ervin Charles wrote:
>
> JoBo,
> If I am taking the head, manifold. computer and all components from the
> same Cherokee wouldn't that remove the risk of mismatching components?
> And Thanks for your response, I thought with all these jeep guys, more would
> have chimed in.
> Charles
> "Jo Bo" <jromasSPAM@columbus.rr.com> wrote in message
> news:JrmIe.61983$yC5.38078@tornado.ohiordc.rr.com. ..
> > Be advised the Cherokees have two totally different computer systems with
> > different heads and manifolds. As I recall there's even differences in
> > different years of the "HO" heads.
> >
> > JoBo
> >
> > "Ervin Charles" <charleserv@charter.net> wrote in message
> > news:PKbIe.3223$c45.1774@fe05.lga...
> >> Hey guys,
> >> I've read Tim Weaver's excellent article on installing a 4.0 head on a
> >> 4.2 block ( http://monsterslayer.com/jeep/40Head/40Head.htm ) and am
> >> preparing to do the same to my 84 CJ7. I'm wondering if anyone in this
> >> group has swapped a factory Cherokee 4.0 fuel injection system into an
> >> earlier model vehicle. I know I'm going to need the wiring harness, the
> >> computer (ECM), as well as the manifold with the MAF, Temp sensor, TPS,
> >> etc., etc.. Other than installing an O2 sensor in the exhaust is there
> >> anything I'm overlooking? I will not be running a catalytic converter.
> >> This seems to be a pretty heads up swap and I really would like to avoid
> >> a $2,000.00 bill for a fuel injection system.
> >> While I'm at it I'll probably change the ignition to the later model
> >> computer controlled ignition.
> >> Any and all input is greatly appreciated.
> >> Thanks,
> >> Charles E.
> >> 84 CJ7
> >> 92 Cherokee
> >> 81 DJ5L
> >>
> >
> >
08-04-2005, 08:05 PM
#14
Guest
Posts: n/a
Re: 4.0 head on a 4.2 questions
Mike,
Tell me more about this neutered computer! My CJ is pure stock, well,
it's got a header and no catalytic converter. My fuel mileage is poor,
probably about 14-16 mpg. 258 cid, T5. 31" tires and the engine lacks power.
This is basically a street Jeep. No big hills in S. Louisiana, no rocks and
I've little time to go muddin! I'm more than willing to fart around with the
current set up to make the Carter BBD useable or driver friendly. Worse case
scenario... Drivability gets worse and then I convert to F.I. So if you
don't mind, elaborate on the 'killing of the computer' . Can I keep the
Carter or do I need to replace it with a Holly
2-bbl? Did you do any other Fuel system , Ignition or engine mods?
Thanks,
Charles
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:42F2A04B.8730B0B3@sympatico.ca...
> Well.... it is a shaky conversion. You have to rely on glue or JB Weld
> to seal up big voids in the water jacket....
>
> Not for me thanks.
>
> And yes, if you get everything from one donor vehicle, you shouldn't
> have issues.
>
> The problem is all the folks that do the FI conversion only boast about
> a 25% boost in power with a drop in gas mileage. Well you get that for
> free by just killing the computer via a Nutter bypass and as a bonus,
> you get an 'increase' in gas mileage.....
>
> All the 4.0's that wheel with me and my BBD 'nuttered' carb engine burn
> a lot more gas than me on the same trails....
>
> I always get a nice 23 mpg loaded on the highway and my CJ7 goes like a
> scalded cat. It will spin up my 33's too easy in first with 3.31 gears
> even, 2nd hits 50+ mph at 4400 rpm, 3rd pulls fast to 75 mph, 4 buries
> the speedo and I have 'no' freakin' urge to find out how fast 5th
> goes....
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> Ervin Charles wrote:
>>
>> JoBo,
>> If I am taking the head, manifold. computer and all components from the
>> same Cherokee wouldn't that remove the risk of mismatching components?
>> And Thanks for your response, I thought with all these jeep guys, more
>> would
>> have chimed in.
>> Charles
>> "Jo Bo" <jromasSPAM@columbus.rr.com> wrote in message
>> news:JrmIe.61983$yC5.38078@tornado.ohiordc.rr.com. ..
>> > Be advised the Cherokees have two totally different computer systems
>> > with
>> > different heads and manifolds. As I recall there's even differences in
>> > different years of the "HO" heads.
>> >
>> > JoBo
>> >
>> > "Ervin Charles" <charleserv@charter.net> wrote in message
>> > news:PKbIe.3223$c45.1774@fe05.lga...
>> >> Hey guys,
>> >> I've read Tim Weaver's excellent article on installing a 4.0 head on
>> >> a
>> >> 4.2 block ( http://monsterslayer.com/jeep/40Head/40Head.htm ) and am
>> >> preparing to do the same to my 84 CJ7. I'm wondering if anyone in this
>> >> group has swapped a factory Cherokee 4.0 fuel injection system into an
>> >> earlier model vehicle. I know I'm going to need the wiring harness,
>> >> the
>> >> computer (ECM), as well as the manifold with the MAF, Temp sensor,
>> >> TPS,
>> >> etc., etc.. Other than installing an O2 sensor in the exhaust is there
>> >> anything I'm overlooking? I will not be running a catalytic converter.
>> >> This seems to be a pretty heads up swap and I really would like to
>> >> avoid
>> >> a $2,000.00 bill for a fuel injection system.
>> >> While I'm at it I'll probably change the ignition to the later model
>> >> computer controlled ignition.
>> >> Any and all input is greatly appreciated.
>> >> Thanks,
>> >> Charles E.
>> >> 84 CJ7
>> >> 92 Cherokee
>> >> 81 DJ5L
>> >>
>> >
>> >
Tell me more about this neutered computer! My CJ is pure stock, well,
it's got a header and no catalytic converter. My fuel mileage is poor,
probably about 14-16 mpg. 258 cid, T5. 31" tires and the engine lacks power.
This is basically a street Jeep. No big hills in S. Louisiana, no rocks and
I've little time to go muddin! I'm more than willing to fart around with the
current set up to make the Carter BBD useable or driver friendly. Worse case
scenario... Drivability gets worse and then I convert to F.I. So if you
don't mind, elaborate on the 'killing of the computer' . Can I keep the
Carter or do I need to replace it with a Holly
2-bbl? Did you do any other Fuel system , Ignition or engine mods?
Thanks,
Charles
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:42F2A04B.8730B0B3@sympatico.ca...
> Well.... it is a shaky conversion. You have to rely on glue or JB Weld
> to seal up big voids in the water jacket....
>
> Not for me thanks.
>
> And yes, if you get everything from one donor vehicle, you shouldn't
> have issues.
>
> The problem is all the folks that do the FI conversion only boast about
> a 25% boost in power with a drop in gas mileage. Well you get that for
> free by just killing the computer via a Nutter bypass and as a bonus,
> you get an 'increase' in gas mileage.....
>
> All the 4.0's that wheel with me and my BBD 'nuttered' carb engine burn
> a lot more gas than me on the same trails....
>
> I always get a nice 23 mpg loaded on the highway and my CJ7 goes like a
> scalded cat. It will spin up my 33's too easy in first with 3.31 gears
> even, 2nd hits 50+ mph at 4400 rpm, 3rd pulls fast to 75 mph, 4 buries
> the speedo and I have 'no' freakin' urge to find out how fast 5th
> goes....
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> Ervin Charles wrote:
>>
>> JoBo,
>> If I am taking the head, manifold. computer and all components from the
>> same Cherokee wouldn't that remove the risk of mismatching components?
>> And Thanks for your response, I thought with all these jeep guys, more
>> would
>> have chimed in.
>> Charles
>> "Jo Bo" <jromasSPAM@columbus.rr.com> wrote in message
>> news:JrmIe.61983$yC5.38078@tornado.ohiordc.rr.com. ..
>> > Be advised the Cherokees have two totally different computer systems
>> > with
>> > different heads and manifolds. As I recall there's even differences in
>> > different years of the "HO" heads.
>> >
>> > JoBo
>> >
>> > "Ervin Charles" <charleserv@charter.net> wrote in message
>> > news:PKbIe.3223$c45.1774@fe05.lga...
>> >> Hey guys,
>> >> I've read Tim Weaver's excellent article on installing a 4.0 head on
>> >> a
>> >> 4.2 block ( http://monsterslayer.com/jeep/40Head/40Head.htm ) and am
>> >> preparing to do the same to my 84 CJ7. I'm wondering if anyone in this
>> >> group has swapped a factory Cherokee 4.0 fuel injection system into an
>> >> earlier model vehicle. I know I'm going to need the wiring harness,
>> >> the
>> >> computer (ECM), as well as the manifold with the MAF, Temp sensor,
>> >> TPS,
>> >> etc., etc.. Other than installing an O2 sensor in the exhaust is there
>> >> anything I'm overlooking? I will not be running a catalytic converter.
>> >> This seems to be a pretty heads up swap and I really would like to
>> >> avoid
>> >> a $2,000.00 bill for a fuel injection system.
>> >> While I'm at it I'll probably change the ignition to the later model
>> >> computer controlled ignition.
>> >> Any and all input is greatly appreciated.
>> >> Thanks,
>> >> Charles E.
>> >> 84 CJ7
>> >> 92 Cherokee
>> >> 81 DJ5L
>> >>
>> >
>> >
08-04-2005, 08:05 PM
#15
Guest
Posts: n/a
Re: 4.0 head on a 4.2 questions
Mike,
Tell me more about this neutered computer! My CJ is pure stock, well,
it's got a header and no catalytic converter. My fuel mileage is poor,
probably about 14-16 mpg. 258 cid, T5. 31" tires and the engine lacks power.
This is basically a street Jeep. No big hills in S. Louisiana, no rocks and
I've little time to go muddin! I'm more than willing to fart around with the
current set up to make the Carter BBD useable or driver friendly. Worse case
scenario... Drivability gets worse and then I convert to F.I. So if you
don't mind, elaborate on the 'killing of the computer' . Can I keep the
Carter or do I need to replace it with a Holly
2-bbl? Did you do any other Fuel system , Ignition or engine mods?
Thanks,
Charles
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:42F2A04B.8730B0B3@sympatico.ca...
> Well.... it is a shaky conversion. You have to rely on glue or JB Weld
> to seal up big voids in the water jacket....
>
> Not for me thanks.
>
> And yes, if you get everything from one donor vehicle, you shouldn't
> have issues.
>
> The problem is all the folks that do the FI conversion only boast about
> a 25% boost in power with a drop in gas mileage. Well you get that for
> free by just killing the computer via a Nutter bypass and as a bonus,
> you get an 'increase' in gas mileage.....
>
> All the 4.0's that wheel with me and my BBD 'nuttered' carb engine burn
> a lot more gas than me on the same trails....
>
> I always get a nice 23 mpg loaded on the highway and my CJ7 goes like a
> scalded cat. It will spin up my 33's too easy in first with 3.31 gears
> even, 2nd hits 50+ mph at 4400 rpm, 3rd pulls fast to 75 mph, 4 buries
> the speedo and I have 'no' freakin' urge to find out how fast 5th
> goes....
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> Ervin Charles wrote:
>>
>> JoBo,
>> If I am taking the head, manifold. computer and all components from the
>> same Cherokee wouldn't that remove the risk of mismatching components?
>> And Thanks for your response, I thought with all these jeep guys, more
>> would
>> have chimed in.
>> Charles
>> "Jo Bo" <jromasSPAM@columbus.rr.com> wrote in message
>> news:JrmIe.61983$yC5.38078@tornado.ohiordc.rr.com. ..
>> > Be advised the Cherokees have two totally different computer systems
>> > with
>> > different heads and manifolds. As I recall there's even differences in
>> > different years of the "HO" heads.
>> >
>> > JoBo
>> >
>> > "Ervin Charles" <charleserv@charter.net> wrote in message
>> > news:PKbIe.3223$c45.1774@fe05.lga...
>> >> Hey guys,
>> >> I've read Tim Weaver's excellent article on installing a 4.0 head on
>> >> a
>> >> 4.2 block ( http://monsterslayer.com/jeep/40Head/40Head.htm ) and am
>> >> preparing to do the same to my 84 CJ7. I'm wondering if anyone in this
>> >> group has swapped a factory Cherokee 4.0 fuel injection system into an
>> >> earlier model vehicle. I know I'm going to need the wiring harness,
>> >> the
>> >> computer (ECM), as well as the manifold with the MAF, Temp sensor,
>> >> TPS,
>> >> etc., etc.. Other than installing an O2 sensor in the exhaust is there
>> >> anything I'm overlooking? I will not be running a catalytic converter.
>> >> This seems to be a pretty heads up swap and I really would like to
>> >> avoid
>> >> a $2,000.00 bill for a fuel injection system.
>> >> While I'm at it I'll probably change the ignition to the later model
>> >> computer controlled ignition.
>> >> Any and all input is greatly appreciated.
>> >> Thanks,
>> >> Charles E.
>> >> 84 CJ7
>> >> 92 Cherokee
>> >> 81 DJ5L
>> >>
>> >
>> >
Tell me more about this neutered computer! My CJ is pure stock, well,
it's got a header and no catalytic converter. My fuel mileage is poor,
probably about 14-16 mpg. 258 cid, T5. 31" tires and the engine lacks power.
This is basically a street Jeep. No big hills in S. Louisiana, no rocks and
I've little time to go muddin! I'm more than willing to fart around with the
current set up to make the Carter BBD useable or driver friendly. Worse case
scenario... Drivability gets worse and then I convert to F.I. So if you
don't mind, elaborate on the 'killing of the computer' . Can I keep the
Carter or do I need to replace it with a Holly
2-bbl? Did you do any other Fuel system , Ignition or engine mods?
Thanks,
Charles
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:42F2A04B.8730B0B3@sympatico.ca...
> Well.... it is a shaky conversion. You have to rely on glue or JB Weld
> to seal up big voids in the water jacket....
>
> Not for me thanks.
>
> And yes, if you get everything from one donor vehicle, you shouldn't
> have issues.
>
> The problem is all the folks that do the FI conversion only boast about
> a 25% boost in power with a drop in gas mileage. Well you get that for
> free by just killing the computer via a Nutter bypass and as a bonus,
> you get an 'increase' in gas mileage.....
>
> All the 4.0's that wheel with me and my BBD 'nuttered' carb engine burn
> a lot more gas than me on the same trails....
>
> I always get a nice 23 mpg loaded on the highway and my CJ7 goes like a
> scalded cat. It will spin up my 33's too easy in first with 3.31 gears
> even, 2nd hits 50+ mph at 4400 rpm, 3rd pulls fast to 75 mph, 4 buries
> the speedo and I have 'no' freakin' urge to find out how fast 5th
> goes....
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> Ervin Charles wrote:
>>
>> JoBo,
>> If I am taking the head, manifold. computer and all components from the
>> same Cherokee wouldn't that remove the risk of mismatching components?
>> And Thanks for your response, I thought with all these jeep guys, more
>> would
>> have chimed in.
>> Charles
>> "Jo Bo" <jromasSPAM@columbus.rr.com> wrote in message
>> news:JrmIe.61983$yC5.38078@tornado.ohiordc.rr.com. ..
>> > Be advised the Cherokees have two totally different computer systems
>> > with
>> > different heads and manifolds. As I recall there's even differences in
>> > different years of the "HO" heads.
>> >
>> > JoBo
>> >
>> > "Ervin Charles" <charleserv@charter.net> wrote in message
>> > news:PKbIe.3223$c45.1774@fe05.lga...
>> >> Hey guys,
>> >> I've read Tim Weaver's excellent article on installing a 4.0 head on
>> >> a
>> >> 4.2 block ( http://monsterslayer.com/jeep/40Head/40Head.htm ) and am
>> >> preparing to do the same to my 84 CJ7. I'm wondering if anyone in this
>> >> group has swapped a factory Cherokee 4.0 fuel injection system into an
>> >> earlier model vehicle. I know I'm going to need the wiring harness,
>> >> the
>> >> computer (ECM), as well as the manifold with the MAF, Temp sensor,
>> >> TPS,
>> >> etc., etc.. Other than installing an O2 sensor in the exhaust is there
>> >> anything I'm overlooking? I will not be running a catalytic converter.
>> >> This seems to be a pretty heads up swap and I really would like to
>> >> avoid
>> >> a $2,000.00 bill for a fuel injection system.
>> >> While I'm at it I'll probably change the ignition to the later model
>> >> computer controlled ignition.
>> >> Any and all input is greatly appreciated.
>> >> Thanks,
>> >> Charles E.
>> >> 84 CJ7
>> >> 92 Cherokee
>> >> 81 DJ5L
>> >>
>> >
>> >
08-04-2005, 08:05 PM
#16
Guest
Posts: n/a
Re: 4.0 head on a 4.2 questions
Mike,
Tell me more about this neutered computer! My CJ is pure stock, well,
it's got a header and no catalytic converter. My fuel mileage is poor,
probably about 14-16 mpg. 258 cid, T5. 31" tires and the engine lacks power.
This is basically a street Jeep. No big hills in S. Louisiana, no rocks and
I've little time to go muddin! I'm more than willing to fart around with the
current set up to make the Carter BBD useable or driver friendly. Worse case
scenario... Drivability gets worse and then I convert to F.I. So if you
don't mind, elaborate on the 'killing of the computer' . Can I keep the
Carter or do I need to replace it with a Holly
2-bbl? Did you do any other Fuel system , Ignition or engine mods?
Thanks,
Charles
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:42F2A04B.8730B0B3@sympatico.ca...
> Well.... it is a shaky conversion. You have to rely on glue or JB Weld
> to seal up big voids in the water jacket....
>
> Not for me thanks.
>
> And yes, if you get everything from one donor vehicle, you shouldn't
> have issues.
>
> The problem is all the folks that do the FI conversion only boast about
> a 25% boost in power with a drop in gas mileage. Well you get that for
> free by just killing the computer via a Nutter bypass and as a bonus,
> you get an 'increase' in gas mileage.....
>
> All the 4.0's that wheel with me and my BBD 'nuttered' carb engine burn
> a lot more gas than me on the same trails....
>
> I always get a nice 23 mpg loaded on the highway and my CJ7 goes like a
> scalded cat. It will spin up my 33's too easy in first with 3.31 gears
> even, 2nd hits 50+ mph at 4400 rpm, 3rd pulls fast to 75 mph, 4 buries
> the speedo and I have 'no' freakin' urge to find out how fast 5th
> goes....
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> Ervin Charles wrote:
>>
>> JoBo,
>> If I am taking the head, manifold. computer and all components from the
>> same Cherokee wouldn't that remove the risk of mismatching components?
>> And Thanks for your response, I thought with all these jeep guys, more
>> would
>> have chimed in.
>> Charles
>> "Jo Bo" <jromasSPAM@columbus.rr.com> wrote in message
>> news:JrmIe.61983$yC5.38078@tornado.ohiordc.rr.com. ..
>> > Be advised the Cherokees have two totally different computer systems
>> > with
>> > different heads and manifolds. As I recall there's even differences in
>> > different years of the "HO" heads.
>> >
>> > JoBo
>> >
>> > "Ervin Charles" <charleserv@charter.net> wrote in message
>> > news:PKbIe.3223$c45.1774@fe05.lga...
>> >> Hey guys,
>> >> I've read Tim Weaver's excellent article on installing a 4.0 head on
>> >> a
>> >> 4.2 block ( http://monsterslayer.com/jeep/40Head/40Head.htm ) and am
>> >> preparing to do the same to my 84 CJ7. I'm wondering if anyone in this
>> >> group has swapped a factory Cherokee 4.0 fuel injection system into an
>> >> earlier model vehicle. I know I'm going to need the wiring harness,
>> >> the
>> >> computer (ECM), as well as the manifold with the MAF, Temp sensor,
>> >> TPS,
>> >> etc., etc.. Other than installing an O2 sensor in the exhaust is there
>> >> anything I'm overlooking? I will not be running a catalytic converter.
>> >> This seems to be a pretty heads up swap and I really would like to
>> >> avoid
>> >> a $2,000.00 bill for a fuel injection system.
>> >> While I'm at it I'll probably change the ignition to the later model
>> >> computer controlled ignition.
>> >> Any and all input is greatly appreciated.
>> >> Thanks,
>> >> Charles E.
>> >> 84 CJ7
>> >> 92 Cherokee
>> >> 81 DJ5L
>> >>
>> >
>> >
Tell me more about this neutered computer! My CJ is pure stock, well,
it's got a header and no catalytic converter. My fuel mileage is poor,
probably about 14-16 mpg. 258 cid, T5. 31" tires and the engine lacks power.
This is basically a street Jeep. No big hills in S. Louisiana, no rocks and
I've little time to go muddin! I'm more than willing to fart around with the
current set up to make the Carter BBD useable or driver friendly. Worse case
scenario... Drivability gets worse and then I convert to F.I. So if you
don't mind, elaborate on the 'killing of the computer' . Can I keep the
Carter or do I need to replace it with a Holly
2-bbl? Did you do any other Fuel system , Ignition or engine mods?
Thanks,
Charles
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:42F2A04B.8730B0B3@sympatico.ca...
> Well.... it is a shaky conversion. You have to rely on glue or JB Weld
> to seal up big voids in the water jacket....
>
> Not for me thanks.
>
> And yes, if you get everything from one donor vehicle, you shouldn't
> have issues.
>
> The problem is all the folks that do the FI conversion only boast about
> a 25% boost in power with a drop in gas mileage. Well you get that for
> free by just killing the computer via a Nutter bypass and as a bonus,
> you get an 'increase' in gas mileage.....
>
> All the 4.0's that wheel with me and my BBD 'nuttered' carb engine burn
> a lot more gas than me on the same trails....
>
> I always get a nice 23 mpg loaded on the highway and my CJ7 goes like a
> scalded cat. It will spin up my 33's too easy in first with 3.31 gears
> even, 2nd hits 50+ mph at 4400 rpm, 3rd pulls fast to 75 mph, 4 buries
> the speedo and I have 'no' freakin' urge to find out how fast 5th
> goes....
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> Ervin Charles wrote:
>>
>> JoBo,
>> If I am taking the head, manifold. computer and all components from the
>> same Cherokee wouldn't that remove the risk of mismatching components?
>> And Thanks for your response, I thought with all these jeep guys, more
>> would
>> have chimed in.
>> Charles
>> "Jo Bo" <jromasSPAM@columbus.rr.com> wrote in message
>> news:JrmIe.61983$yC5.38078@tornado.ohiordc.rr.com. ..
>> > Be advised the Cherokees have two totally different computer systems
>> > with
>> > different heads and manifolds. As I recall there's even differences in
>> > different years of the "HO" heads.
>> >
>> > JoBo
>> >
>> > "Ervin Charles" <charleserv@charter.net> wrote in message
>> > news:PKbIe.3223$c45.1774@fe05.lga...
>> >> Hey guys,
>> >> I've read Tim Weaver's excellent article on installing a 4.0 head on
>> >> a
>> >> 4.2 block ( http://monsterslayer.com/jeep/40Head/40Head.htm ) and am
>> >> preparing to do the same to my 84 CJ7. I'm wondering if anyone in this
>> >> group has swapped a factory Cherokee 4.0 fuel injection system into an
>> >> earlier model vehicle. I know I'm going to need the wiring harness,
>> >> the
>> >> computer (ECM), as well as the manifold with the MAF, Temp sensor,
>> >> TPS,
>> >> etc., etc.. Other than installing an O2 sensor in the exhaust is there
>> >> anything I'm overlooking? I will not be running a catalytic converter.
>> >> This seems to be a pretty heads up swap and I really would like to
>> >> avoid
>> >> a $2,000.00 bill for a fuel injection system.
>> >> While I'm at it I'll probably change the ignition to the later model
>> >> computer controlled ignition.
>> >> Any and all input is greatly appreciated.
>> >> Thanks,
>> >> Charles E.
>> >> 84 CJ7
>> >> 92 Cherokee
>> >> 81 DJ5L
>> >>
>> >
>> >
08-04-2005, 08:05 PM
#17
Guest
Posts: n/a
Re: 4.0 head on a 4.2 questions
Mike,
Tell me more about this neutered computer! My CJ is pure stock, well,
it's got a header and no catalytic converter. My fuel mileage is poor,
probably about 14-16 mpg. 258 cid, T5. 31" tires and the engine lacks power.
This is basically a street Jeep. No big hills in S. Louisiana, no rocks and
I've little time to go muddin! I'm more than willing to fart around with the
current set up to make the Carter BBD useable or driver friendly. Worse case
scenario... Drivability gets worse and then I convert to F.I. So if you
don't mind, elaborate on the 'killing of the computer' . Can I keep the
Carter or do I need to replace it with a Holly
2-bbl? Did you do any other Fuel system , Ignition or engine mods?
Thanks,
Charles
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:42F2A04B.8730B0B3@sympatico.ca...
> Well.... it is a shaky conversion. You have to rely on glue or JB Weld
> to seal up big voids in the water jacket....
>
> Not for me thanks.
>
> And yes, if you get everything from one donor vehicle, you shouldn't
> have issues.
>
> The problem is all the folks that do the FI conversion only boast about
> a 25% boost in power with a drop in gas mileage. Well you get that for
> free by just killing the computer via a Nutter bypass and as a bonus,
> you get an 'increase' in gas mileage.....
>
> All the 4.0's that wheel with me and my BBD 'nuttered' carb engine burn
> a lot more gas than me on the same trails....
>
> I always get a nice 23 mpg loaded on the highway and my CJ7 goes like a
> scalded cat. It will spin up my 33's too easy in first with 3.31 gears
> even, 2nd hits 50+ mph at 4400 rpm, 3rd pulls fast to 75 mph, 4 buries
> the speedo and I have 'no' freakin' urge to find out how fast 5th
> goes....
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> Ervin Charles wrote:
>>
>> JoBo,
>> If I am taking the head, manifold. computer and all components from the
>> same Cherokee wouldn't that remove the risk of mismatching components?
>> And Thanks for your response, I thought with all these jeep guys, more
>> would
>> have chimed in.
>> Charles
>> "Jo Bo" <jromasSPAM@columbus.rr.com> wrote in message
>> news:JrmIe.61983$yC5.38078@tornado.ohiordc.rr.com. ..
>> > Be advised the Cherokees have two totally different computer systems
>> > with
>> > different heads and manifolds. As I recall there's even differences in
>> > different years of the "HO" heads.
>> >
>> > JoBo
>> >
>> > "Ervin Charles" <charleserv@charter.net> wrote in message
>> > news:PKbIe.3223$c45.1774@fe05.lga...
>> >> Hey guys,
>> >> I've read Tim Weaver's excellent article on installing a 4.0 head on
>> >> a
>> >> 4.2 block ( http://monsterslayer.com/jeep/40Head/40Head.htm ) and am
>> >> preparing to do the same to my 84 CJ7. I'm wondering if anyone in this
>> >> group has swapped a factory Cherokee 4.0 fuel injection system into an
>> >> earlier model vehicle. I know I'm going to need the wiring harness,
>> >> the
>> >> computer (ECM), as well as the manifold with the MAF, Temp sensor,
>> >> TPS,
>> >> etc., etc.. Other than installing an O2 sensor in the exhaust is there
>> >> anything I'm overlooking? I will not be running a catalytic converter.
>> >> This seems to be a pretty heads up swap and I really would like to
>> >> avoid
>> >> a $2,000.00 bill for a fuel injection system.
>> >> While I'm at it I'll probably change the ignition to the later model
>> >> computer controlled ignition.
>> >> Any and all input is greatly appreciated.
>> >> Thanks,
>> >> Charles E.
>> >> 84 CJ7
>> >> 92 Cherokee
>> >> 81 DJ5L
>> >>
>> >
>> >
Tell me more about this neutered computer! My CJ is pure stock, well,
it's got a header and no catalytic converter. My fuel mileage is poor,
probably about 14-16 mpg. 258 cid, T5. 31" tires and the engine lacks power.
This is basically a street Jeep. No big hills in S. Louisiana, no rocks and
I've little time to go muddin! I'm more than willing to fart around with the
current set up to make the Carter BBD useable or driver friendly. Worse case
scenario... Drivability gets worse and then I convert to F.I. So if you
don't mind, elaborate on the 'killing of the computer' . Can I keep the
Carter or do I need to replace it with a Holly
2-bbl? Did you do any other Fuel system , Ignition or engine mods?
Thanks,
Charles
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:42F2A04B.8730B0B3@sympatico.ca...
> Well.... it is a shaky conversion. You have to rely on glue or JB Weld
> to seal up big voids in the water jacket....
>
> Not for me thanks.
>
> And yes, if you get everything from one donor vehicle, you shouldn't
> have issues.
>
> The problem is all the folks that do the FI conversion only boast about
> a 25% boost in power with a drop in gas mileage. Well you get that for
> free by just killing the computer via a Nutter bypass and as a bonus,
> you get an 'increase' in gas mileage.....
>
> All the 4.0's that wheel with me and my BBD 'nuttered' carb engine burn
> a lot more gas than me on the same trails....
>
> I always get a nice 23 mpg loaded on the highway and my CJ7 goes like a
> scalded cat. It will spin up my 33's too easy in first with 3.31 gears
> even, 2nd hits 50+ mph at 4400 rpm, 3rd pulls fast to 75 mph, 4 buries
> the speedo and I have 'no' freakin' urge to find out how fast 5th
> goes....
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> Ervin Charles wrote:
>>
>> JoBo,
>> If I am taking the head, manifold. computer and all components from the
>> same Cherokee wouldn't that remove the risk of mismatching components?
>> And Thanks for your response, I thought with all these jeep guys, more
>> would
>> have chimed in.
>> Charles
>> "Jo Bo" <jromasSPAM@columbus.rr.com> wrote in message
>> news:JrmIe.61983$yC5.38078@tornado.ohiordc.rr.com. ..
>> > Be advised the Cherokees have two totally different computer systems
>> > with
>> > different heads and manifolds. As I recall there's even differences in
>> > different years of the "HO" heads.
>> >
>> > JoBo
>> >
>> > "Ervin Charles" <charleserv@charter.net> wrote in message
>> > news:PKbIe.3223$c45.1774@fe05.lga...
>> >> Hey guys,
>> >> I've read Tim Weaver's excellent article on installing a 4.0 head on
>> >> a
>> >> 4.2 block ( http://monsterslayer.com/jeep/40Head/40Head.htm ) and am
>> >> preparing to do the same to my 84 CJ7. I'm wondering if anyone in this
>> >> group has swapped a factory Cherokee 4.0 fuel injection system into an
>> >> earlier model vehicle. I know I'm going to need the wiring harness,
>> >> the
>> >> computer (ECM), as well as the manifold with the MAF, Temp sensor,
>> >> TPS,
>> >> etc., etc.. Other than installing an O2 sensor in the exhaust is there
>> >> anything I'm overlooking? I will not be running a catalytic converter.
>> >> This seems to be a pretty heads up swap and I really would like to
>> >> avoid
>> >> a $2,000.00 bill for a fuel injection system.
>> >> While I'm at it I'll probably change the ignition to the later model
>> >> computer controlled ignition.
>> >> Any and all input is greatly appreciated.
>> >> Thanks,
>> >> Charles E.
>> >> 84 CJ7
>> >> 92 Cherokee
>> >> 81 DJ5L
>> >>
>> >
>> >
08-04-2005, 08:36 PM
#18
Guest
Posts: n/a
Re: 4.0 head on a 4.2 questions
Basically the 'Nutter' bypass just connects the ignition module directly
to the distributor as it was before the failed excuse for a Ford
emissions computer was stuck in in 82.
I add 2 new wires rather than mess inside the harness like the author,
John Nutter does. The orange and purple wires at the ignition module
get connected to the orange and purple at the distributor.
http://home.sprynet.com/~dale02/ignmods.htm
Then the timing and carb mix get set manually. The BBD is a nice carb
and it does have the manual mix screws under caps to set. A carb kit
for the BBD is about $20.00 and is highly recommended as well as a
clean/ream of the idle tubes to make it just purr.... The tool to clean
the idle tubes can be obtained from any welding supply shop. Doing this
first makes the idle mix set 'soooo' much easier. The end of the tubes
are crimped and crimped slightly too small. Reaming them was even
recommended as a factory fix.
Here is a link on the idle tube job. I can do it on the trial in 15
minutes if it gets crap in it. The venturi will come out from the top
with a twist.
http://www.off-road.com/jeep/tech/engine/carter.html
I added an Accel 'SuperCoil' for a hot spark and OEM wires from the
$tealer to give me great power and mileage. I also went manual cable
for choke.
I do only get 15 or so if I now use regular, but with 91 octane, I get a
sweet 11L/100 KM or 23 mpg and it just flies.
It will not stall on sand pit wall climbs, get too steep at 400 rpm and
it just starts digging holes. I did the nutter in 98 and love it.
I also passed the last emissions with a straight pipe and dynomax
superturbo muffler with 15 ppm HC, 0.16% CO and even though I 'don't'
need to pass NOx, got 589!
There are 'mechanics' or better said 'techs' because I don't think any
of them have a real license on this group that have a ---- fest when I
post these numbers because they don't think anything 'manually' set up
can be even close to what a computer can tell them to do. They forget
that 'real' mechanics actually knew how to tune engines before
computers. LOL! Sorry for the obvious troll, but they are just sooo
funny with their squawks....
Mike
Ervin Charles wrote:
>
> Mike,
> Tell me more about this neutered computer! My CJ is pure stock, well,
> it's got a header and no catalytic converter. My fuel mileage is poor,
> probably about 14-16 mpg. 258 cid, T5. 31" tires and the engine lacks power.
> This is basically a street Jeep. No big hills in S. Louisiana, no rocks and
> I've little time to go muddin! I'm more than willing to fart around with the
> current set up to make the Carter BBD useable or driver friendly. Worse case
> scenario... Drivability gets worse and then I convert to F.I. So if you
> don't mind, elaborate on the 'killing of the computer' . Can I keep the
> Carter or do I need to replace it with a Holly
> 2-bbl? Did you do any other Fuel system , Ignition or engine mods?
> Thanks,
> Charles
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:42F2A04B.8730B0B3@sympatico.ca...
> > Well.... it is a shaky conversion. You have to rely on glue or JB Weld
> > to seal up big voids in the water jacket....
> >
> > Not for me thanks.
> >
> > And yes, if you get everything from one donor vehicle, you shouldn't
> > have issues.
> >
> > The problem is all the folks that do the FI conversion only boast about
> > a 25% boost in power with a drop in gas mileage. Well you get that for
> > free by just killing the computer via a Nutter bypass and as a bonus,
> > you get an 'increase' in gas mileage.....
> >
> > All the 4.0's that wheel with me and my BBD 'nuttered' carb engine burn
> > a lot more gas than me on the same trails....
> >
> > I always get a nice 23 mpg loaded on the highway and my CJ7 goes like a
> > scalded cat. It will spin up my 33's too easy in first with 3.31 gears
> > even, 2nd hits 50+ mph at 4400 rpm, 3rd pulls fast to 75 mph, 4 buries
> > the speedo and I have 'no' freakin' urge to find out how fast 5th
> > goes....
> >
> > Mike
> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > 88 Cherokee 235 BFG AT's
> >
> > Ervin Charles wrote:
> >>
> >> JoBo,
> >> If I am taking the head, manifold. computer and all components from the
> >> same Cherokee wouldn't that remove the risk of mismatching components?
> >> And Thanks for your response, I thought with all these jeep guys, more
> >> would
> >> have chimed in.
> >> Charles
> >> "Jo Bo" <jromasSPAM@columbus.rr.com> wrote in message
> >> news:JrmIe.61983$yC5.38078@tornado.ohiordc.rr.com. ..
> >> > Be advised the Cherokees have two totally different computer systems
> >> > with
> >> > different heads and manifolds. As I recall there's even differences in
> >> > different years of the "HO" heads.
> >> >
> >> > JoBo
> >> >
> >> > "Ervin Charles" <charleserv@charter.net> wrote in message
> >> > news:PKbIe.3223$c45.1774@fe05.lga...
> >> >> Hey guys,
> >> >> I've read Tim Weaver's excellent article on installing a 4.0 head on
> >> >> a
> >> >> 4.2 block ( http://monsterslayer.com/jeep/40Head/40Head.htm ) and am
> >> >> preparing to do the same to my 84 CJ7. I'm wondering if anyone in this
> >> >> group has swapped a factory Cherokee 4.0 fuel injection system into an
> >> >> earlier model vehicle. I know I'm going to need the wiring harness,
> >> >> the
> >> >> computer (ECM), as well as the manifold with the MAF, Temp sensor,
> >> >> TPS,
> >> >> etc., etc.. Other than installing an O2 sensor in the exhaust is there
> >> >> anything I'm overlooking? I will not be running a catalytic converter.
> >> >> This seems to be a pretty heads up swap and I really would like to
> >> >> avoid
> >> >> a $2,000.00 bill for a fuel injection system.
> >> >> While I'm at it I'll probably change the ignition to the later model
> >> >> computer controlled ignition.
> >> >> Any and all input is greatly appreciated.
> >> >> Thanks,
> >> >> Charles E.
> >> >> 84 CJ7
> >> >> 92 Cherokee
> >> >> 81 DJ5L
> >> >>
> >> >
> >> >
to the distributor as it was before the failed excuse for a Ford
emissions computer was stuck in in 82.
I add 2 new wires rather than mess inside the harness like the author,
John Nutter does. The orange and purple wires at the ignition module
get connected to the orange and purple at the distributor.
http://home.sprynet.com/~dale02/ignmods.htm
Then the timing and carb mix get set manually. The BBD is a nice carb
and it does have the manual mix screws under caps to set. A carb kit
for the BBD is about $20.00 and is highly recommended as well as a
clean/ream of the idle tubes to make it just purr.... The tool to clean
the idle tubes can be obtained from any welding supply shop. Doing this
first makes the idle mix set 'soooo' much easier. The end of the tubes
are crimped and crimped slightly too small. Reaming them was even
recommended as a factory fix.
Here is a link on the idle tube job. I can do it on the trial in 15
minutes if it gets crap in it. The venturi will come out from the top
with a twist.
http://www.off-road.com/jeep/tech/engine/carter.html
I added an Accel 'SuperCoil' for a hot spark and OEM wires from the
$tealer to give me great power and mileage. I also went manual cable
for choke.
I do only get 15 or so if I now use regular, but with 91 octane, I get a
sweet 11L/100 KM or 23 mpg and it just flies.
It will not stall on sand pit wall climbs, get too steep at 400 rpm and
it just starts digging holes. I did the nutter in 98 and love it.
I also passed the last emissions with a straight pipe and dynomax
superturbo muffler with 15 ppm HC, 0.16% CO and even though I 'don't'
need to pass NOx, got 589!
There are 'mechanics' or better said 'techs' because I don't think any
of them have a real license on this group that have a ---- fest when I
post these numbers because they don't think anything 'manually' set up
can be even close to what a computer can tell them to do. They forget
that 'real' mechanics actually knew how to tune engines before
computers. LOL! Sorry for the obvious troll, but they are just sooo
funny with their squawks....
Mike
Ervin Charles wrote:
>
> Mike,
> Tell me more about this neutered computer! My CJ is pure stock, well,
> it's got a header and no catalytic converter. My fuel mileage is poor,
> probably about 14-16 mpg. 258 cid, T5. 31" tires and the engine lacks power.
> This is basically a street Jeep. No big hills in S. Louisiana, no rocks and
> I've little time to go muddin! I'm more than willing to fart around with the
> current set up to make the Carter BBD useable or driver friendly. Worse case
> scenario... Drivability gets worse and then I convert to F.I. So if you
> don't mind, elaborate on the 'killing of the computer' . Can I keep the
> Carter or do I need to replace it with a Holly
> 2-bbl? Did you do any other Fuel system , Ignition or engine mods?
> Thanks,
> Charles
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:42F2A04B.8730B0B3@sympatico.ca...
> > Well.... it is a shaky conversion. You have to rely on glue or JB Weld
> > to seal up big voids in the water jacket....
> >
> > Not for me thanks.
> >
> > And yes, if you get everything from one donor vehicle, you shouldn't
> > have issues.
> >
> > The problem is all the folks that do the FI conversion only boast about
> > a 25% boost in power with a drop in gas mileage. Well you get that for
> > free by just killing the computer via a Nutter bypass and as a bonus,
> > you get an 'increase' in gas mileage.....
> >
> > All the 4.0's that wheel with me and my BBD 'nuttered' carb engine burn
> > a lot more gas than me on the same trails....
> >
> > I always get a nice 23 mpg loaded on the highway and my CJ7 goes like a
> > scalded cat. It will spin up my 33's too easy in first with 3.31 gears
> > even, 2nd hits 50+ mph at 4400 rpm, 3rd pulls fast to 75 mph, 4 buries
> > the speedo and I have 'no' freakin' urge to find out how fast 5th
> > goes....
> >
> > Mike
> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > 88 Cherokee 235 BFG AT's
> >
> > Ervin Charles wrote:
> >>
> >> JoBo,
> >> If I am taking the head, manifold. computer and all components from the
> >> same Cherokee wouldn't that remove the risk of mismatching components?
> >> And Thanks for your response, I thought with all these jeep guys, more
> >> would
> >> have chimed in.
> >> Charles
> >> "Jo Bo" <jromasSPAM@columbus.rr.com> wrote in message
> >> news:JrmIe.61983$yC5.38078@tornado.ohiordc.rr.com. ..
> >> > Be advised the Cherokees have two totally different computer systems
> >> > with
> >> > different heads and manifolds. As I recall there's even differences in
> >> > different years of the "HO" heads.
> >> >
> >> > JoBo
> >> >
> >> > "Ervin Charles" <charleserv@charter.net> wrote in message
> >> > news:PKbIe.3223$c45.1774@fe05.lga...
> >> >> Hey guys,
> >> >> I've read Tim Weaver's excellent article on installing a 4.0 head on
> >> >> a
> >> >> 4.2 block ( http://monsterslayer.com/jeep/40Head/40Head.htm ) and am
> >> >> preparing to do the same to my 84 CJ7. I'm wondering if anyone in this
> >> >> group has swapped a factory Cherokee 4.0 fuel injection system into an
> >> >> earlier model vehicle. I know I'm going to need the wiring harness,
> >> >> the
> >> >> computer (ECM), as well as the manifold with the MAF, Temp sensor,
> >> >> TPS,
> >> >> etc., etc.. Other than installing an O2 sensor in the exhaust is there
> >> >> anything I'm overlooking? I will not be running a catalytic converter.
> >> >> This seems to be a pretty heads up swap and I really would like to
> >> >> avoid
> >> >> a $2,000.00 bill for a fuel injection system.
> >> >> While I'm at it I'll probably change the ignition to the later model
> >> >> computer controlled ignition.
> >> >> Any and all input is greatly appreciated.
> >> >> Thanks,
> >> >> Charles E.
> >> >> 84 CJ7
> >> >> 92 Cherokee
> >> >> 81 DJ5L
> >> >>
> >> >
> >> >
08-04-2005, 08:36 PM
#19
Guest
Posts: n/a
Re: 4.0 head on a 4.2 questions
Basically the 'Nutter' bypass just connects the ignition module directly
to the distributor as it was before the failed excuse for a Ford
emissions computer was stuck in in 82.
I add 2 new wires rather than mess inside the harness like the author,
John Nutter does. The orange and purple wires at the ignition module
get connected to the orange and purple at the distributor.
http://home.sprynet.com/~dale02/ignmods.htm
Then the timing and carb mix get set manually. The BBD is a nice carb
and it does have the manual mix screws under caps to set. A carb kit
for the BBD is about $20.00 and is highly recommended as well as a
clean/ream of the idle tubes to make it just purr.... The tool to clean
the idle tubes can be obtained from any welding supply shop. Doing this
first makes the idle mix set 'soooo' much easier. The end of the tubes
are crimped and crimped slightly too small. Reaming them was even
recommended as a factory fix.
Here is a link on the idle tube job. I can do it on the trial in 15
minutes if it gets crap in it. The venturi will come out from the top
with a twist.
http://www.off-road.com/jeep/tech/engine/carter.html
I added an Accel 'SuperCoil' for a hot spark and OEM wires from the
$tealer to give me great power and mileage. I also went manual cable
for choke.
I do only get 15 or so if I now use regular, but with 91 octane, I get a
sweet 11L/100 KM or 23 mpg and it just flies.
It will not stall on sand pit wall climbs, get too steep at 400 rpm and
it just starts digging holes. I did the nutter in 98 and love it.
I also passed the last emissions with a straight pipe and dynomax
superturbo muffler with 15 ppm HC, 0.16% CO and even though I 'don't'
need to pass NOx, got 589!
There are 'mechanics' or better said 'techs' because I don't think any
of them have a real license on this group that have a ---- fest when I
post these numbers because they don't think anything 'manually' set up
can be even close to what a computer can tell them to do. They forget
that 'real' mechanics actually knew how to tune engines before
computers. LOL! Sorry for the obvious troll, but they are just sooo
funny with their squawks....
Mike
Ervin Charles wrote:
>
> Mike,
> Tell me more about this neutered computer! My CJ is pure stock, well,
> it's got a header and no catalytic converter. My fuel mileage is poor,
> probably about 14-16 mpg. 258 cid, T5. 31" tires and the engine lacks power.
> This is basically a street Jeep. No big hills in S. Louisiana, no rocks and
> I've little time to go muddin! I'm more than willing to fart around with the
> current set up to make the Carter BBD useable or driver friendly. Worse case
> scenario... Drivability gets worse and then I convert to F.I. So if you
> don't mind, elaborate on the 'killing of the computer' . Can I keep the
> Carter or do I need to replace it with a Holly
> 2-bbl? Did you do any other Fuel system , Ignition or engine mods?
> Thanks,
> Charles
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:42F2A04B.8730B0B3@sympatico.ca...
> > Well.... it is a shaky conversion. You have to rely on glue or JB Weld
> > to seal up big voids in the water jacket....
> >
> > Not for me thanks.
> >
> > And yes, if you get everything from one donor vehicle, you shouldn't
> > have issues.
> >
> > The problem is all the folks that do the FI conversion only boast about
> > a 25% boost in power with a drop in gas mileage. Well you get that for
> > free by just killing the computer via a Nutter bypass and as a bonus,
> > you get an 'increase' in gas mileage.....
> >
> > All the 4.0's that wheel with me and my BBD 'nuttered' carb engine burn
> > a lot more gas than me on the same trails....
> >
> > I always get a nice 23 mpg loaded on the highway and my CJ7 goes like a
> > scalded cat. It will spin up my 33's too easy in first with 3.31 gears
> > even, 2nd hits 50+ mph at 4400 rpm, 3rd pulls fast to 75 mph, 4 buries
> > the speedo and I have 'no' freakin' urge to find out how fast 5th
> > goes....
> >
> > Mike
> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > 88 Cherokee 235 BFG AT's
> >
> > Ervin Charles wrote:
> >>
> >> JoBo,
> >> If I am taking the head, manifold. computer and all components from the
> >> same Cherokee wouldn't that remove the risk of mismatching components?
> >> And Thanks for your response, I thought with all these jeep guys, more
> >> would
> >> have chimed in.
> >> Charles
> >> "Jo Bo" <jromasSPAM@columbus.rr.com> wrote in message
> >> news:JrmIe.61983$yC5.38078@tornado.ohiordc.rr.com. ..
> >> > Be advised the Cherokees have two totally different computer systems
> >> > with
> >> > different heads and manifolds. As I recall there's even differences in
> >> > different years of the "HO" heads.
> >> >
> >> > JoBo
> >> >
> >> > "Ervin Charles" <charleserv@charter.net> wrote in message
> >> > news:PKbIe.3223$c45.1774@fe05.lga...
> >> >> Hey guys,
> >> >> I've read Tim Weaver's excellent article on installing a 4.0 head on
> >> >> a
> >> >> 4.2 block ( http://monsterslayer.com/jeep/40Head/40Head.htm ) and am
> >> >> preparing to do the same to my 84 CJ7. I'm wondering if anyone in this
> >> >> group has swapped a factory Cherokee 4.0 fuel injection system into an
> >> >> earlier model vehicle. I know I'm going to need the wiring harness,
> >> >> the
> >> >> computer (ECM), as well as the manifold with the MAF, Temp sensor,
> >> >> TPS,
> >> >> etc., etc.. Other than installing an O2 sensor in the exhaust is there
> >> >> anything I'm overlooking? I will not be running a catalytic converter.
> >> >> This seems to be a pretty heads up swap and I really would like to
> >> >> avoid
> >> >> a $2,000.00 bill for a fuel injection system.
> >> >> While I'm at it I'll probably change the ignition to the later model
> >> >> computer controlled ignition.
> >> >> Any and all input is greatly appreciated.
> >> >> Thanks,
> >> >> Charles E.
> >> >> 84 CJ7
> >> >> 92 Cherokee
> >> >> 81 DJ5L
> >> >>
> >> >
> >> >
to the distributor as it was before the failed excuse for a Ford
emissions computer was stuck in in 82.
I add 2 new wires rather than mess inside the harness like the author,
John Nutter does. The orange and purple wires at the ignition module
get connected to the orange and purple at the distributor.
http://home.sprynet.com/~dale02/ignmods.htm
Then the timing and carb mix get set manually. The BBD is a nice carb
and it does have the manual mix screws under caps to set. A carb kit
for the BBD is about $20.00 and is highly recommended as well as a
clean/ream of the idle tubes to make it just purr.... The tool to clean
the idle tubes can be obtained from any welding supply shop. Doing this
first makes the idle mix set 'soooo' much easier. The end of the tubes
are crimped and crimped slightly too small. Reaming them was even
recommended as a factory fix.
Here is a link on the idle tube job. I can do it on the trial in 15
minutes if it gets crap in it. The venturi will come out from the top
with a twist.
http://www.off-road.com/jeep/tech/engine/carter.html
I added an Accel 'SuperCoil' for a hot spark and OEM wires from the
$tealer to give me great power and mileage. I also went manual cable
for choke.
I do only get 15 or so if I now use regular, but with 91 octane, I get a
sweet 11L/100 KM or 23 mpg and it just flies.
It will not stall on sand pit wall climbs, get too steep at 400 rpm and
it just starts digging holes. I did the nutter in 98 and love it.
I also passed the last emissions with a straight pipe and dynomax
superturbo muffler with 15 ppm HC, 0.16% CO and even though I 'don't'
need to pass NOx, got 589!
There are 'mechanics' or better said 'techs' because I don't think any
of them have a real license on this group that have a ---- fest when I
post these numbers because they don't think anything 'manually' set up
can be even close to what a computer can tell them to do. They forget
that 'real' mechanics actually knew how to tune engines before
computers. LOL! Sorry for the obvious troll, but they are just sooo
funny with their squawks....
Mike
Ervin Charles wrote:
>
> Mike,
> Tell me more about this neutered computer! My CJ is pure stock, well,
> it's got a header and no catalytic converter. My fuel mileage is poor,
> probably about 14-16 mpg. 258 cid, T5. 31" tires and the engine lacks power.
> This is basically a street Jeep. No big hills in S. Louisiana, no rocks and
> I've little time to go muddin! I'm more than willing to fart around with the
> current set up to make the Carter BBD useable or driver friendly. Worse case
> scenario... Drivability gets worse and then I convert to F.I. So if you
> don't mind, elaborate on the 'killing of the computer' . Can I keep the
> Carter or do I need to replace it with a Holly
> 2-bbl? Did you do any other Fuel system , Ignition or engine mods?
> Thanks,
> Charles
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:42F2A04B.8730B0B3@sympatico.ca...
> > Well.... it is a shaky conversion. You have to rely on glue or JB Weld
> > to seal up big voids in the water jacket....
> >
> > Not for me thanks.
> >
> > And yes, if you get everything from one donor vehicle, you shouldn't
> > have issues.
> >
> > The problem is all the folks that do the FI conversion only boast about
> > a 25% boost in power with a drop in gas mileage. Well you get that for
> > free by just killing the computer via a Nutter bypass and as a bonus,
> > you get an 'increase' in gas mileage.....
> >
> > All the 4.0's that wheel with me and my BBD 'nuttered' carb engine burn
> > a lot more gas than me on the same trails....
> >
> > I always get a nice 23 mpg loaded on the highway and my CJ7 goes like a
> > scalded cat. It will spin up my 33's too easy in first with 3.31 gears
> > even, 2nd hits 50+ mph at 4400 rpm, 3rd pulls fast to 75 mph, 4 buries
> > the speedo and I have 'no' freakin' urge to find out how fast 5th
> > goes....
> >
> > Mike
> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > 88 Cherokee 235 BFG AT's
> >
> > Ervin Charles wrote:
> >>
> >> JoBo,
> >> If I am taking the head, manifold. computer and all components from the
> >> same Cherokee wouldn't that remove the risk of mismatching components?
> >> And Thanks for your response, I thought with all these jeep guys, more
> >> would
> >> have chimed in.
> >> Charles
> >> "Jo Bo" <jromasSPAM@columbus.rr.com> wrote in message
> >> news:JrmIe.61983$yC5.38078@tornado.ohiordc.rr.com. ..
> >> > Be advised the Cherokees have two totally different computer systems
> >> > with
> >> > different heads and manifolds. As I recall there's even differences in
> >> > different years of the "HO" heads.
> >> >
> >> > JoBo
> >> >
> >> > "Ervin Charles" <charleserv@charter.net> wrote in message
> >> > news:PKbIe.3223$c45.1774@fe05.lga...
> >> >> Hey guys,
> >> >> I've read Tim Weaver's excellent article on installing a 4.0 head on
> >> >> a
> >> >> 4.2 block ( http://monsterslayer.com/jeep/40Head/40Head.htm ) and am
> >> >> preparing to do the same to my 84 CJ7. I'm wondering if anyone in this
> >> >> group has swapped a factory Cherokee 4.0 fuel injection system into an
> >> >> earlier model vehicle. I know I'm going to need the wiring harness,
> >> >> the
> >> >> computer (ECM), as well as the manifold with the MAF, Temp sensor,
> >> >> TPS,
> >> >> etc., etc.. Other than installing an O2 sensor in the exhaust is there
> >> >> anything I'm overlooking? I will not be running a catalytic converter.
> >> >> This seems to be a pretty heads up swap and I really would like to
> >> >> avoid
> >> >> a $2,000.00 bill for a fuel injection system.
> >> >> While I'm at it I'll probably change the ignition to the later model
> >> >> computer controlled ignition.
> >> >> Any and all input is greatly appreciated.
> >> >> Thanks,
> >> >> Charles E.
> >> >> 84 CJ7
> >> >> 92 Cherokee
> >> >> 81 DJ5L
> >> >>
> >> >
> >> >
08-04-2005, 08:36 PM
#20
Guest
Posts: n/a
Re: 4.0 head on a 4.2 questions
Basically the 'Nutter' bypass just connects the ignition module directly
to the distributor as it was before the failed excuse for a Ford
emissions computer was stuck in in 82.
I add 2 new wires rather than mess inside the harness like the author,
John Nutter does. The orange and purple wires at the ignition module
get connected to the orange and purple at the distributor.
http://home.sprynet.com/~dale02/ignmods.htm
Then the timing and carb mix get set manually. The BBD is a nice carb
and it does have the manual mix screws under caps to set. A carb kit
for the BBD is about $20.00 and is highly recommended as well as a
clean/ream of the idle tubes to make it just purr.... The tool to clean
the idle tubes can be obtained from any welding supply shop. Doing this
first makes the idle mix set 'soooo' much easier. The end of the tubes
are crimped and crimped slightly too small. Reaming them was even
recommended as a factory fix.
Here is a link on the idle tube job. I can do it on the trial in 15
minutes if it gets crap in it. The venturi will come out from the top
with a twist.
http://www.off-road.com/jeep/tech/engine/carter.html
I added an Accel 'SuperCoil' for a hot spark and OEM wires from the
$tealer to give me great power and mileage. I also went manual cable
for choke.
I do only get 15 or so if I now use regular, but with 91 octane, I get a
sweet 11L/100 KM or 23 mpg and it just flies.
It will not stall on sand pit wall climbs, get too steep at 400 rpm and
it just starts digging holes. I did the nutter in 98 and love it.
I also passed the last emissions with a straight pipe and dynomax
superturbo muffler with 15 ppm HC, 0.16% CO and even though I 'don't'
need to pass NOx, got 589!
There are 'mechanics' or better said 'techs' because I don't think any
of them have a real license on this group that have a ---- fest when I
post these numbers because they don't think anything 'manually' set up
can be even close to what a computer can tell them to do. They forget
that 'real' mechanics actually knew how to tune engines before
computers. LOL! Sorry for the obvious troll, but they are just sooo
funny with their squawks....
Mike
Ervin Charles wrote:
>
> Mike,
> Tell me more about this neutered computer! My CJ is pure stock, well,
> it's got a header and no catalytic converter. My fuel mileage is poor,
> probably about 14-16 mpg. 258 cid, T5. 31" tires and the engine lacks power.
> This is basically a street Jeep. No big hills in S. Louisiana, no rocks and
> I've little time to go muddin! I'm more than willing to fart around with the
> current set up to make the Carter BBD useable or driver friendly. Worse case
> scenario... Drivability gets worse and then I convert to F.I. So if you
> don't mind, elaborate on the 'killing of the computer' . Can I keep the
> Carter or do I need to replace it with a Holly
> 2-bbl? Did you do any other Fuel system , Ignition or engine mods?
> Thanks,
> Charles
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:42F2A04B.8730B0B3@sympatico.ca...
> > Well.... it is a shaky conversion. You have to rely on glue or JB Weld
> > to seal up big voids in the water jacket....
> >
> > Not for me thanks.
> >
> > And yes, if you get everything from one donor vehicle, you shouldn't
> > have issues.
> >
> > The problem is all the folks that do the FI conversion only boast about
> > a 25% boost in power with a drop in gas mileage. Well you get that for
> > free by just killing the computer via a Nutter bypass and as a bonus,
> > you get an 'increase' in gas mileage.....
> >
> > All the 4.0's that wheel with me and my BBD 'nuttered' carb engine burn
> > a lot more gas than me on the same trails....
> >
> > I always get a nice 23 mpg loaded on the highway and my CJ7 goes like a
> > scalded cat. It will spin up my 33's too easy in first with 3.31 gears
> > even, 2nd hits 50+ mph at 4400 rpm, 3rd pulls fast to 75 mph, 4 buries
> > the speedo and I have 'no' freakin' urge to find out how fast 5th
> > goes....
> >
> > Mike
> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > 88 Cherokee 235 BFG AT's
> >
> > Ervin Charles wrote:
> >>
> >> JoBo,
> >> If I am taking the head, manifold. computer and all components from the
> >> same Cherokee wouldn't that remove the risk of mismatching components?
> >> And Thanks for your response, I thought with all these jeep guys, more
> >> would
> >> have chimed in.
> >> Charles
> >> "Jo Bo" <jromasSPAM@columbus.rr.com> wrote in message
> >> news:JrmIe.61983$yC5.38078@tornado.ohiordc.rr.com. ..
> >> > Be advised the Cherokees have two totally different computer systems
> >> > with
> >> > different heads and manifolds. As I recall there's even differences in
> >> > different years of the "HO" heads.
> >> >
> >> > JoBo
> >> >
> >> > "Ervin Charles" <charleserv@charter.net> wrote in message
> >> > news:PKbIe.3223$c45.1774@fe05.lga...
> >> >> Hey guys,
> >> >> I've read Tim Weaver's excellent article on installing a 4.0 head on
> >> >> a
> >> >> 4.2 block ( http://monsterslayer.com/jeep/40Head/40Head.htm ) and am
> >> >> preparing to do the same to my 84 CJ7. I'm wondering if anyone in this
> >> >> group has swapped a factory Cherokee 4.0 fuel injection system into an
> >> >> earlier model vehicle. I know I'm going to need the wiring harness,
> >> >> the
> >> >> computer (ECM), as well as the manifold with the MAF, Temp sensor,
> >> >> TPS,
> >> >> etc., etc.. Other than installing an O2 sensor in the exhaust is there
> >> >> anything I'm overlooking? I will not be running a catalytic converter.
> >> >> This seems to be a pretty heads up swap and I really would like to
> >> >> avoid
> >> >> a $2,000.00 bill for a fuel injection system.
> >> >> While I'm at it I'll probably change the ignition to the later model
> >> >> computer controlled ignition.
> >> >> Any and all input is greatly appreciated.
> >> >> Thanks,
> >> >> Charles E.
> >> >> 84 CJ7
> >> >> 92 Cherokee
> >> >> 81 DJ5L
> >> >>
> >> >
> >> >
to the distributor as it was before the failed excuse for a Ford
emissions computer was stuck in in 82.
I add 2 new wires rather than mess inside the harness like the author,
John Nutter does. The orange and purple wires at the ignition module
get connected to the orange and purple at the distributor.
http://home.sprynet.com/~dale02/ignmods.htm
Then the timing and carb mix get set manually. The BBD is a nice carb
and it does have the manual mix screws under caps to set. A carb kit
for the BBD is about $20.00 and is highly recommended as well as a
clean/ream of the idle tubes to make it just purr.... The tool to clean
the idle tubes can be obtained from any welding supply shop. Doing this
first makes the idle mix set 'soooo' much easier. The end of the tubes
are crimped and crimped slightly too small. Reaming them was even
recommended as a factory fix.
Here is a link on the idle tube job. I can do it on the trial in 15
minutes if it gets crap in it. The venturi will come out from the top
with a twist.
http://www.off-road.com/jeep/tech/engine/carter.html
I added an Accel 'SuperCoil' for a hot spark and OEM wires from the
$tealer to give me great power and mileage. I also went manual cable
for choke.
I do only get 15 or so if I now use regular, but with 91 octane, I get a
sweet 11L/100 KM or 23 mpg and it just flies.
It will not stall on sand pit wall climbs, get too steep at 400 rpm and
it just starts digging holes. I did the nutter in 98 and love it.
I also passed the last emissions with a straight pipe and dynomax
superturbo muffler with 15 ppm HC, 0.16% CO and even though I 'don't'
need to pass NOx, got 589!
There are 'mechanics' or better said 'techs' because I don't think any
of them have a real license on this group that have a ---- fest when I
post these numbers because they don't think anything 'manually' set up
can be even close to what a computer can tell them to do. They forget
that 'real' mechanics actually knew how to tune engines before
computers. LOL! Sorry for the obvious troll, but they are just sooo
funny with their squawks....
Mike
Ervin Charles wrote:
>
> Mike,
> Tell me more about this neutered computer! My CJ is pure stock, well,
> it's got a header and no catalytic converter. My fuel mileage is poor,
> probably about 14-16 mpg. 258 cid, T5. 31" tires and the engine lacks power.
> This is basically a street Jeep. No big hills in S. Louisiana, no rocks and
> I've little time to go muddin! I'm more than willing to fart around with the
> current set up to make the Carter BBD useable or driver friendly. Worse case
> scenario... Drivability gets worse and then I convert to F.I. So if you
> don't mind, elaborate on the 'killing of the computer' . Can I keep the
> Carter or do I need to replace it with a Holly
> 2-bbl? Did you do any other Fuel system , Ignition or engine mods?
> Thanks,
> Charles
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:42F2A04B.8730B0B3@sympatico.ca...
> > Well.... it is a shaky conversion. You have to rely on glue or JB Weld
> > to seal up big voids in the water jacket....
> >
> > Not for me thanks.
> >
> > And yes, if you get everything from one donor vehicle, you shouldn't
> > have issues.
> >
> > The problem is all the folks that do the FI conversion only boast about
> > a 25% boost in power with a drop in gas mileage. Well you get that for
> > free by just killing the computer via a Nutter bypass and as a bonus,
> > you get an 'increase' in gas mileage.....
> >
> > All the 4.0's that wheel with me and my BBD 'nuttered' carb engine burn
> > a lot more gas than me on the same trails....
> >
> > I always get a nice 23 mpg loaded on the highway and my CJ7 goes like a
> > scalded cat. It will spin up my 33's too easy in first with 3.31 gears
> > even, 2nd hits 50+ mph at 4400 rpm, 3rd pulls fast to 75 mph, 4 buries
> > the speedo and I have 'no' freakin' urge to find out how fast 5th
> > goes....
> >
> > Mike
> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > 88 Cherokee 235 BFG AT's
> >
> > Ervin Charles wrote:
> >>
> >> JoBo,
> >> If I am taking the head, manifold. computer and all components from the
> >> same Cherokee wouldn't that remove the risk of mismatching components?
> >> And Thanks for your response, I thought with all these jeep guys, more
> >> would
> >> have chimed in.
> >> Charles
> >> "Jo Bo" <jromasSPAM@columbus.rr.com> wrote in message
> >> news:JrmIe.61983$yC5.38078@tornado.ohiordc.rr.com. ..
> >> > Be advised the Cherokees have two totally different computer systems
> >> > with
> >> > different heads and manifolds. As I recall there's even differences in
> >> > different years of the "HO" heads.
> >> >
> >> > JoBo
> >> >
> >> > "Ervin Charles" <charleserv@charter.net> wrote in message
> >> > news:PKbIe.3223$c45.1774@fe05.lga...
> >> >> Hey guys,
> >> >> I've read Tim Weaver's excellent article on installing a 4.0 head on
> >> >> a
> >> >> 4.2 block ( http://monsterslayer.com/jeep/40Head/40Head.htm ) and am
> >> >> preparing to do the same to my 84 CJ7. I'm wondering if anyone in this
> >> >> group has swapped a factory Cherokee 4.0 fuel injection system into an
> >> >> earlier model vehicle. I know I'm going to need the wiring harness,
> >> >> the
> >> >> computer (ECM), as well as the manifold with the MAF, Temp sensor,
> >> >> TPS,
> >> >> etc., etc.. Other than installing an O2 sensor in the exhaust is there
> >> >> anything I'm overlooking? I will not be running a catalytic converter.
> >> >> This seems to be a pretty heads up swap and I really would like to
> >> >> avoid
> >> >> a $2,000.00 bill for a fuel injection system.
> >> >> While I'm at it I'll probably change the ignition to the later model
> >> >> computer controlled ignition.
> >> >> Any and all input is greatly appreciated.
> >> >> Thanks,
> >> >> Charles E.
> >> >> 84 CJ7
> >> >> 92 Cherokee
> >> >> 81 DJ5L
> >> >>
> >> >
> >> >