4.0 head on a 4.2 questions
08-05-2005, 08:19 AM
#31
Guest
Posts: n/a
Re: 4.0 head on a 4.2 questions
Well, I am not a 'real' mechanic, but I sure can tune a 258 CJ engine to
get consistently better than 20 mpg and that is not just on my engine
alone. One of our tenants had an 85 automatic and we used within a
couple liters the same amount on a 200 mile run and every other time we
compared. Conversions get fun, but we get 11L/100 km or 23 mpg.
Our Cherokee 4.0 gets 10L/100km.
Now if we try to run gasohol or any 'ol' mixes like the owners manual
warns 'not' to do, then the mileage and performance sucks the big one
and we only get 17 or 18 mpg.
Maybe we have better gas? LOL.
Naw, we just don't need no stinking computer to tell us how to tune them
properly.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
HomeBrewer wrote:
>
> Like the "real" mechanic said, you'll have to tune it manually to get it
> right. And even then don't expect to get 23mpg in a cj. Unless your in a
> different country using kilometers or something.
get consistently better than 20 mpg and that is not just on my engine
alone. One of our tenants had an 85 automatic and we used within a
couple liters the same amount on a 200 mile run and every other time we
compared. Conversions get fun, but we get 11L/100 km or 23 mpg.
Our Cherokee 4.0 gets 10L/100km.
Now if we try to run gasohol or any 'ol' mixes like the owners manual
warns 'not' to do, then the mileage and performance sucks the big one
and we only get 17 or 18 mpg.
Maybe we have better gas? LOL.
Naw, we just don't need no stinking computer to tell us how to tune them
properly.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
HomeBrewer wrote:
>
> Like the "real" mechanic said, you'll have to tune it manually to get it
> right. And even then don't expect to get 23mpg in a cj. Unless your in a
> different country using kilometers or something.
08-05-2005, 08:19 AM
#32
Guest
Posts: n/a
Re: 4.0 head on a 4.2 questions
Well, I am not a 'real' mechanic, but I sure can tune a 258 CJ engine to
get consistently better than 20 mpg and that is not just on my engine
alone. One of our tenants had an 85 automatic and we used within a
couple liters the same amount on a 200 mile run and every other time we
compared. Conversions get fun, but we get 11L/100 km or 23 mpg.
Our Cherokee 4.0 gets 10L/100km.
Now if we try to run gasohol or any 'ol' mixes like the owners manual
warns 'not' to do, then the mileage and performance sucks the big one
and we only get 17 or 18 mpg.
Maybe we have better gas? LOL.
Naw, we just don't need no stinking computer to tell us how to tune them
properly.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
HomeBrewer wrote:
>
> Like the "real" mechanic said, you'll have to tune it manually to get it
> right. And even then don't expect to get 23mpg in a cj. Unless your in a
> different country using kilometers or something.
get consistently better than 20 mpg and that is not just on my engine
alone. One of our tenants had an 85 automatic and we used within a
couple liters the same amount on a 200 mile run and every other time we
compared. Conversions get fun, but we get 11L/100 km or 23 mpg.
Our Cherokee 4.0 gets 10L/100km.
Now if we try to run gasohol or any 'ol' mixes like the owners manual
warns 'not' to do, then the mileage and performance sucks the big one
and we only get 17 or 18 mpg.
Maybe we have better gas? LOL.
Naw, we just don't need no stinking computer to tell us how to tune them
properly.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
HomeBrewer wrote:
>
> Like the "real" mechanic said, you'll have to tune it manually to get it
> right. And even then don't expect to get 23mpg in a cj. Unless your in a
> different country using kilometers or something.
08-05-2005, 08:19 AM
#33
Guest
Posts: n/a
Re: 4.0 head on a 4.2 questions
Well, I am not a 'real' mechanic, but I sure can tune a 258 CJ engine to
get consistently better than 20 mpg and that is not just on my engine
alone. One of our tenants had an 85 automatic and we used within a
couple liters the same amount on a 200 mile run and every other time we
compared. Conversions get fun, but we get 11L/100 km or 23 mpg.
Our Cherokee 4.0 gets 10L/100km.
Now if we try to run gasohol or any 'ol' mixes like the owners manual
warns 'not' to do, then the mileage and performance sucks the big one
and we only get 17 or 18 mpg.
Maybe we have better gas? LOL.
Naw, we just don't need no stinking computer to tell us how to tune them
properly.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
HomeBrewer wrote:
>
> Like the "real" mechanic said, you'll have to tune it manually to get it
> right. And even then don't expect to get 23mpg in a cj. Unless your in a
> different country using kilometers or something.
get consistently better than 20 mpg and that is not just on my engine
alone. One of our tenants had an 85 automatic and we used within a
couple liters the same amount on a 200 mile run and every other time we
compared. Conversions get fun, but we get 11L/100 km or 23 mpg.
Our Cherokee 4.0 gets 10L/100km.
Now if we try to run gasohol or any 'ol' mixes like the owners manual
warns 'not' to do, then the mileage and performance sucks the big one
and we only get 17 or 18 mpg.
Maybe we have better gas? LOL.
Naw, we just don't need no stinking computer to tell us how to tune them
properly.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
HomeBrewer wrote:
>
> Like the "real" mechanic said, you'll have to tune it manually to get it
> right. And even then don't expect to get 23mpg in a cj. Unless your in a
> different country using kilometers or something.
08-05-2005, 01:39 PM
#34
Guest
Posts: n/a
Re: 4.0 head on a 4.2 questions
One problem you are going to have with swapping in a fuel injection system
is the Smog ***** are going to be looking for a carburator and the attendant
smog crap. When they can't find it, you will immediately fail.
The $2000 kit includes the Get Out of Jail Free card that the smog *****
will demand. Anotehr benefit is that it will all bolt right up, you don't
need to mess around with fabricating stuff to fit where it was never
intended to go.
"Ervin Charles" <charleserv@charter.net> wrote in message
news:PKbIe.3223$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
>
08-05-2005, 01:39 PM
#35
Guest
Posts: n/a
Re: 4.0 head on a 4.2 questions
One problem you are going to have with swapping in a fuel injection system
is the Smog ***** are going to be looking for a carburator and the attendant
smog crap. When they can't find it, you will immediately fail.
The $2000 kit includes the Get Out of Jail Free card that the smog *****
will demand. Anotehr benefit is that it will all bolt right up, you don't
need to mess around with fabricating stuff to fit where it was never
intended to go.
"Ervin Charles" <charleserv@charter.net> wrote in message
news:PKbIe.3223$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
>
08-05-2005, 01:39 PM
#36
Guest
Posts: n/a
Re: 4.0 head on a 4.2 questions
One problem you are going to have with swapping in a fuel injection system
is the Smog ***** are going to be looking for a carburator and the attendant
smog crap. When they can't find it, you will immediately fail.
The $2000 kit includes the Get Out of Jail Free card that the smog *****
will demand. Anotehr benefit is that it will all bolt right up, you don't
need to mess around with fabricating stuff to fit where it was never
intended to go.
"Ervin Charles" <charleserv@charter.net> wrote in message
news:PKbIe.3223$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
>
08-05-2005, 01:39 PM
#37
Guest
Posts: n/a
Re: 4.0 head on a 4.2 questions
One problem you are going to have with swapping in a fuel injection system
is the Smog ***** are going to be looking for a carburator and the attendant
smog crap. When they can't find it, you will immediately fail.
The $2000 kit includes the Get Out of Jail Free card that the smog *****
will demand. Anotehr benefit is that it will all bolt right up, you don't
need to mess around with fabricating stuff to fit where it was never
intended to go.
"Ervin Charles" <charleserv@charter.net> wrote in message
news:PKbIe.3223$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
>
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