No Measurable Vacuum at Idle???
02-23-2004, 02:19 PM
#31
Guest
Posts: n/a
Re: No Measurable Vacuum at Idle???
The 258 one uses ported vacuum.
Mike
"L.W.(ßill) ------ III" wrote:
>
> You know the Exhaust Gas Recirculation valve may only work
> correctly using full manifold vacuum.
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Mike Romain wrote:
> >
> > I just checked my book and it looks like you have 2 vacuum nipples. The
> > bottom one is the 'spark' port and the upper one is the 'egr' port.
> > That implies both are ported vacuum to me.
> >
> > Mike
Mike
"L.W.(ßill) ------ III" wrote:
>
> You know the Exhaust Gas Recirculation valve may only work
> correctly using full manifold vacuum.
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Mike Romain wrote:
> >
> > I just checked my book and it looks like you have 2 vacuum nipples. The
> > bottom one is the 'spark' port and the upper one is the 'egr' port.
> > That implies both are ported vacuum to me.
> >
> > Mike
02-23-2004, 08:19 PM
#32
Guest
Posts: n/a
Re: No Measurable Vacuum at Idle???
Ok Guy's,
This is what I've got. I tried switching the vacuum ports. Originally, I
had the distributor line connected to the port on the Carter 1 bbl which is
supposed to be connected to the (TCS) thing that works off engine temp.
It's located mid to lower on the driver's side of the block. Anyways, I
moved the vacuum line from this diagonal carb. (no vacuum at idle) port to
the "spark" port which supplies manifold vacuum.
I must admit, Intown driving is lot nicer. I've got good acceleration so
far (I think better). Seems to not have upper RPM flatness anymore. I'll
try it tomorrow on the highway on my way to work. I'm going to post another
question that relates to the timing in relation to the vacuum line move.
Thanks all for your various suggestions. By the way, It seems I got the
metering rod adjusted correctly, but we'll see tomorrow on the highway.
--
Thanks Always !!!
Paul '75 CJ5 258
Vail, CO.
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:403A525B.11FFFD2D@sympatico.ca...
> The 258 one uses ported vacuum.
>
> Mike
>
> "L.W.(ßill) ------ III" wrote:
> >
> > You know the Exhaust Gas Recirculation valve may only work
> > correctly using full manifold vacuum.
> > God Bless America, ßill O|||||||O
> > mailto:-------------------- http://www.----------.com/
> >
> > Mike Romain wrote:
> > >
> > > I just checked my book and it looks like you have 2 vacuum nipples.
The
> > > bottom one is the 'spark' port and the upper one is the 'egr' port.
> > > That implies both are ported vacuum to me.
> > >
> > > Mike
This is what I've got. I tried switching the vacuum ports. Originally, I
had the distributor line connected to the port on the Carter 1 bbl which is
supposed to be connected to the (TCS) thing that works off engine temp.
It's located mid to lower on the driver's side of the block. Anyways, I
moved the vacuum line from this diagonal carb. (no vacuum at idle) port to
the "spark" port which supplies manifold vacuum.
I must admit, Intown driving is lot nicer. I've got good acceleration so
far (I think better). Seems to not have upper RPM flatness anymore. I'll
try it tomorrow on the highway on my way to work. I'm going to post another
question that relates to the timing in relation to the vacuum line move.
Thanks all for your various suggestions. By the way, It seems I got the
metering rod adjusted correctly, but we'll see tomorrow on the highway.
--
Thanks Always !!!
Paul '75 CJ5 258
Vail, CO.
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:403A525B.11FFFD2D@sympatico.ca...
> The 258 one uses ported vacuum.
>
> Mike
>
> "L.W.(ßill) ------ III" wrote:
> >
> > You know the Exhaust Gas Recirculation valve may only work
> > correctly using full manifold vacuum.
> > God Bless America, ßill O|||||||O
> > mailto:-------------------- http://www.----------.com/
> >
> > Mike Romain wrote:
> > >
> > > I just checked my book and it looks like you have 2 vacuum nipples.
The
> > > bottom one is the 'spark' port and the upper one is the 'egr' port.
> > > That implies both are ported vacuum to me.
> > >
> > > Mike
02-23-2004, 08:19 PM
#33
Guest
Posts: n/a
Re: No Measurable Vacuum at Idle???
Ok Guy's,
This is what I've got. I tried switching the vacuum ports. Originally, I
had the distributor line connected to the port on the Carter 1 bbl which is
supposed to be connected to the (TCS) thing that works off engine temp.
It's located mid to lower on the driver's side of the block. Anyways, I
moved the vacuum line from this diagonal carb. (no vacuum at idle) port to
the "spark" port which supplies manifold vacuum.
I must admit, Intown driving is lot nicer. I've got good acceleration so
far (I think better). Seems to not have upper RPM flatness anymore. I'll
try it tomorrow on the highway on my way to work. I'm going to post another
question that relates to the timing in relation to the vacuum line move.
Thanks all for your various suggestions. By the way, It seems I got the
metering rod adjusted correctly, but we'll see tomorrow on the highway.
--
Thanks Always !!!
Paul '75 CJ5 258
Vail, CO.
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:403A525B.11FFFD2D@sympatico.ca...
> The 258 one uses ported vacuum.
>
> Mike
>
> "L.W.(ßill) ------ III" wrote:
> >
> > You know the Exhaust Gas Recirculation valve may only work
> > correctly using full manifold vacuum.
> > God Bless America, ßill O|||||||O
> > mailto:-------------------- http://www.----------.com/
> >
> > Mike Romain wrote:
> > >
> > > I just checked my book and it looks like you have 2 vacuum nipples.
The
> > > bottom one is the 'spark' port and the upper one is the 'egr' port.
> > > That implies both are ported vacuum to me.
> > >
> > > Mike
This is what I've got. I tried switching the vacuum ports. Originally, I
had the distributor line connected to the port on the Carter 1 bbl which is
supposed to be connected to the (TCS) thing that works off engine temp.
It's located mid to lower on the driver's side of the block. Anyways, I
moved the vacuum line from this diagonal carb. (no vacuum at idle) port to
the "spark" port which supplies manifold vacuum.
I must admit, Intown driving is lot nicer. I've got good acceleration so
far (I think better). Seems to not have upper RPM flatness anymore. I'll
try it tomorrow on the highway on my way to work. I'm going to post another
question that relates to the timing in relation to the vacuum line move.
Thanks all for your various suggestions. By the way, It seems I got the
metering rod adjusted correctly, but we'll see tomorrow on the highway.
--
Thanks Always !!!
Paul '75 CJ5 258
Vail, CO.
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:403A525B.11FFFD2D@sympatico.ca...
> The 258 one uses ported vacuum.
>
> Mike
>
> "L.W.(ßill) ------ III" wrote:
> >
> > You know the Exhaust Gas Recirculation valve may only work
> > correctly using full manifold vacuum.
> > God Bless America, ßill O|||||||O
> > mailto:-------------------- http://www.----------.com/
> >
> > Mike Romain wrote:
> > >
> > > I just checked my book and it looks like you have 2 vacuum nipples.
The
> > > bottom one is the 'spark' port and the upper one is the 'egr' port.
> > > That implies both are ported vacuum to me.
> > >
> > > Mike
02-23-2004, 08:19 PM
#34
Guest
Posts: n/a
Re: No Measurable Vacuum at Idle???
Ok Guy's,
This is what I've got. I tried switching the vacuum ports. Originally, I
had the distributor line connected to the port on the Carter 1 bbl which is
supposed to be connected to the (TCS) thing that works off engine temp.
It's located mid to lower on the driver's side of the block. Anyways, I
moved the vacuum line from this diagonal carb. (no vacuum at idle) port to
the "spark" port which supplies manifold vacuum.
I must admit, Intown driving is lot nicer. I've got good acceleration so
far (I think better). Seems to not have upper RPM flatness anymore. I'll
try it tomorrow on the highway on my way to work. I'm going to post another
question that relates to the timing in relation to the vacuum line move.
Thanks all for your various suggestions. By the way, It seems I got the
metering rod adjusted correctly, but we'll see tomorrow on the highway.
--
Thanks Always !!!
Paul '75 CJ5 258
Vail, CO.
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:403A525B.11FFFD2D@sympatico.ca...
> The 258 one uses ported vacuum.
>
> Mike
>
> "L.W.(ßill) ------ III" wrote:
> >
> > You know the Exhaust Gas Recirculation valve may only work
> > correctly using full manifold vacuum.
> > God Bless America, ßill O|||||||O
> > mailto:-------------------- http://www.----------.com/
> >
> > Mike Romain wrote:
> > >
> > > I just checked my book and it looks like you have 2 vacuum nipples.
The
> > > bottom one is the 'spark' port and the upper one is the 'egr' port.
> > > That implies both are ported vacuum to me.
> > >
> > > Mike
This is what I've got. I tried switching the vacuum ports. Originally, I
had the distributor line connected to the port on the Carter 1 bbl which is
supposed to be connected to the (TCS) thing that works off engine temp.
It's located mid to lower on the driver's side of the block. Anyways, I
moved the vacuum line from this diagonal carb. (no vacuum at idle) port to
the "spark" port which supplies manifold vacuum.
I must admit, Intown driving is lot nicer. I've got good acceleration so
far (I think better). Seems to not have upper RPM flatness anymore. I'll
try it tomorrow on the highway on my way to work. I'm going to post another
question that relates to the timing in relation to the vacuum line move.
Thanks all for your various suggestions. By the way, It seems I got the
metering rod adjusted correctly, but we'll see tomorrow on the highway.
--
Thanks Always !!!
Paul '75 CJ5 258
Vail, CO.
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:403A525B.11FFFD2D@sympatico.ca...
> The 258 one uses ported vacuum.
>
> Mike
>
> "L.W.(ßill) ------ III" wrote:
> >
> > You know the Exhaust Gas Recirculation valve may only work
> > correctly using full manifold vacuum.
> > God Bless America, ßill O|||||||O
> > mailto:-------------------- http://www.----------.com/
> >
> > Mike Romain wrote:
> > >
> > > I just checked my book and it looks like you have 2 vacuum nipples.
The
> > > bottom one is the 'spark' port and the upper one is the 'egr' port.
> > > That implies both are ported vacuum to me.
> > >
> > > Mike
02-24-2004, 05:34 PM
#35
Guest
Posts: n/a
Re: No Measurable Vacuum at Idle???
On any other car, I'd make sure I had the EGR circuit. But, on the Jeep,
I have to ask, "Do I need it? What are the pros and cons?" I expect
someone's gonna tell me I have to have it. I know what it does but does
"lowering the combustion point" equate to power, mileage, cold
starting/driving?
Right now, it runs like crap but I need a cam. If I don't work the choke,
it bogs badly. I tuned it the other day and have timing, mixture and idle
set to factory. The stock settings make it run horribly.
o_o_o_o
Best Regards, /| ,[_____],
Jim, WP3JQ |ŻŻŻL --O|||||||O-
()_)Ż()_) ŻŻŻŻŻ )_)
EM60qk 30.447439N 086.628959W
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:403A0F4E.C8A15606@sympatico.ca...
> I just checked my book and it looks like you have 2 vacuum nipples. The
> bottom one is the 'spark' port and the upper one is the 'egr' port.
> That implies both are ported vacuum to me.
>
> Mike
>
> Drink wrote:
> >
> > Here's something I've pondered for years...
> > When I tune the Jeep, I have no measurable vacuum at idle. If I raise
the
> > RPM above idle around 1,000 and up (revving high), it shows plenty of
> > vacuum; 16 inches or so I think. I have a '76 258 with the ole' Carter
YF
> > carb with minimal emissions. In fact, the only thing I have is the
vacuum
> > advance ported from the carb, PCV to manifold, canister to manifold and
> > canister pulling vapor from around the bowl. The intake manifold ports
were
> > all plugged with bungs. I'm describing the plumbing from memory. So,
don't
> > quote me but I'm pretty sure that's it. The engine runs just fine
besides
> > being cold natured. but, it ain't a problem down here in Florida.
> > All the hoses are in fine shape and I can't find any leaks anywhere.
I've
> > torqued the manifolds and they've never leaked either through various
head
> > and manifold swaps. The carb's tight too. So, what's the deal with an
> > otherwise healthy engine that shows good compression. The distributor's
new
> > and I've ruled out a ruptured diaphragm. What could it be? Am I being
> > stupid and there shouldn't be any measured vacuum at idle?
> > o_o_o_o
> > Best Regards, /| ,[_____],
> > Jim, WP3JQ |ŻŻŻL --O|||||||O-
> > ()_)Ż()_) ŻŻŻŻŻ )_)
> > EM60qk 30.447439N 086.628959W
I have to ask, "Do I need it? What are the pros and cons?" I expect
someone's gonna tell me I have to have it. I know what it does but does
"lowering the combustion point" equate to power, mileage, cold
starting/driving?
Right now, it runs like crap but I need a cam. If I don't work the choke,
it bogs badly. I tuned it the other day and have timing, mixture and idle
set to factory. The stock settings make it run horribly.
o_o_o_o
Best Regards, /| ,[_____],
Jim, WP3JQ |ŻŻŻL --O|||||||O-
()_)Ż()_) ŻŻŻŻŻ )_)
EM60qk 30.447439N 086.628959W
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:403A0F4E.C8A15606@sympatico.ca...
> I just checked my book and it looks like you have 2 vacuum nipples. The
> bottom one is the 'spark' port and the upper one is the 'egr' port.
> That implies both are ported vacuum to me.
>
> Mike
>
> Drink wrote:
> >
> > Here's something I've pondered for years...
> > When I tune the Jeep, I have no measurable vacuum at idle. If I raise
the
> > RPM above idle around 1,000 and up (revving high), it shows plenty of
> > vacuum; 16 inches or so I think. I have a '76 258 with the ole' Carter
YF
> > carb with minimal emissions. In fact, the only thing I have is the
vacuum
> > advance ported from the carb, PCV to manifold, canister to manifold and
> > canister pulling vapor from around the bowl. The intake manifold ports
were
> > all plugged with bungs. I'm describing the plumbing from memory. So,
don't
> > quote me but I'm pretty sure that's it. The engine runs just fine
besides
> > being cold natured. but, it ain't a problem down here in Florida.
> > All the hoses are in fine shape and I can't find any leaks anywhere.
I've
> > torqued the manifolds and they've never leaked either through various
head
> > and manifold swaps. The carb's tight too. So, what's the deal with an
> > otherwise healthy engine that shows good compression. The distributor's
new
> > and I've ruled out a ruptured diaphragm. What could it be? Am I being
> > stupid and there shouldn't be any measured vacuum at idle?
> > o_o_o_o
> > Best Regards, /| ,[_____],
> > Jim, WP3JQ |ŻŻŻL --O|||||||O-
> > ()_)Ż()_) ŻŻŻŻŻ )_)
> > EM60qk 30.447439N 086.628959W
02-24-2004, 05:34 PM
#36
Guest
Posts: n/a
Re: No Measurable Vacuum at Idle???
On any other car, I'd make sure I had the EGR circuit. But, on the Jeep,
I have to ask, "Do I need it? What are the pros and cons?" I expect
someone's gonna tell me I have to have it. I know what it does but does
"lowering the combustion point" equate to power, mileage, cold
starting/driving?
Right now, it runs like crap but I need a cam. If I don't work the choke,
it bogs badly. I tuned it the other day and have timing, mixture and idle
set to factory. The stock settings make it run horribly.
o_o_o_o
Best Regards, /| ,[_____],
Jim, WP3JQ |ŻŻŻL --O|||||||O-
()_)Ż()_) ŻŻŻŻŻ )_)
EM60qk 30.447439N 086.628959W
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:403A0F4E.C8A15606@sympatico.ca...
> I just checked my book and it looks like you have 2 vacuum nipples. The
> bottom one is the 'spark' port and the upper one is the 'egr' port.
> That implies both are ported vacuum to me.
>
> Mike
>
> Drink wrote:
> >
> > Here's something I've pondered for years...
> > When I tune the Jeep, I have no measurable vacuum at idle. If I raise
the
> > RPM above idle around 1,000 and up (revving high), it shows plenty of
> > vacuum; 16 inches or so I think. I have a '76 258 with the ole' Carter
YF
> > carb with minimal emissions. In fact, the only thing I have is the
vacuum
> > advance ported from the carb, PCV to manifold, canister to manifold and
> > canister pulling vapor from around the bowl. The intake manifold ports
were
> > all plugged with bungs. I'm describing the plumbing from memory. So,
don't
> > quote me but I'm pretty sure that's it. The engine runs just fine
besides
> > being cold natured. but, it ain't a problem down here in Florida.
> > All the hoses are in fine shape and I can't find any leaks anywhere.
I've
> > torqued the manifolds and they've never leaked either through various
head
> > and manifold swaps. The carb's tight too. So, what's the deal with an
> > otherwise healthy engine that shows good compression. The distributor's
new
> > and I've ruled out a ruptured diaphragm. What could it be? Am I being
> > stupid and there shouldn't be any measured vacuum at idle?
> > o_o_o_o
> > Best Regards, /| ,[_____],
> > Jim, WP3JQ |ŻŻŻL --O|||||||O-
> > ()_)Ż()_) ŻŻŻŻŻ )_)
> > EM60qk 30.447439N 086.628959W
I have to ask, "Do I need it? What are the pros and cons?" I expect
someone's gonna tell me I have to have it. I know what it does but does
"lowering the combustion point" equate to power, mileage, cold
starting/driving?
Right now, it runs like crap but I need a cam. If I don't work the choke,
it bogs badly. I tuned it the other day and have timing, mixture and idle
set to factory. The stock settings make it run horribly.
o_o_o_o
Best Regards, /| ,[_____],
Jim, WP3JQ |ŻŻŻL --O|||||||O-
()_)Ż()_) ŻŻŻŻŻ )_)
EM60qk 30.447439N 086.628959W
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:403A0F4E.C8A15606@sympatico.ca...
> I just checked my book and it looks like you have 2 vacuum nipples. The
> bottom one is the 'spark' port and the upper one is the 'egr' port.
> That implies both are ported vacuum to me.
>
> Mike
>
> Drink wrote:
> >
> > Here's something I've pondered for years...
> > When I tune the Jeep, I have no measurable vacuum at idle. If I raise
the
> > RPM above idle around 1,000 and up (revving high), it shows plenty of
> > vacuum; 16 inches or so I think. I have a '76 258 with the ole' Carter
YF
> > carb with minimal emissions. In fact, the only thing I have is the
vacuum
> > advance ported from the carb, PCV to manifold, canister to manifold and
> > canister pulling vapor from around the bowl. The intake manifold ports
were
> > all plugged with bungs. I'm describing the plumbing from memory. So,
don't
> > quote me but I'm pretty sure that's it. The engine runs just fine
besides
> > being cold natured. but, it ain't a problem down here in Florida.
> > All the hoses are in fine shape and I can't find any leaks anywhere.
I've
> > torqued the manifolds and they've never leaked either through various
head
> > and manifold swaps. The carb's tight too. So, what's the deal with an
> > otherwise healthy engine that shows good compression. The distributor's
new
> > and I've ruled out a ruptured diaphragm. What could it be? Am I being
> > stupid and there shouldn't be any measured vacuum at idle?
> > o_o_o_o
> > Best Regards, /| ,[_____],
> > Jim, WP3JQ |ŻŻŻL --O|||||||O-
> > ()_)Ż()_) ŻŻŻŻŻ )_)
> > EM60qk 30.447439N 086.628959W
02-24-2004, 05:34 PM
#37
Guest
Posts: n/a
Re: No Measurable Vacuum at Idle???
On any other car, I'd make sure I had the EGR circuit. But, on the Jeep,
I have to ask, "Do I need it? What are the pros and cons?" I expect
someone's gonna tell me I have to have it. I know what it does but does
"lowering the combustion point" equate to power, mileage, cold
starting/driving?
Right now, it runs like crap but I need a cam. If I don't work the choke,
it bogs badly. I tuned it the other day and have timing, mixture and idle
set to factory. The stock settings make it run horribly.
o_o_o_o
Best Regards, /| ,[_____],
Jim, WP3JQ |ŻŻŻL --O|||||||O-
()_)Ż()_) ŻŻŻŻŻ )_)
EM60qk 30.447439N 086.628959W
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:403A0F4E.C8A15606@sympatico.ca...
> I just checked my book and it looks like you have 2 vacuum nipples. The
> bottom one is the 'spark' port and the upper one is the 'egr' port.
> That implies both are ported vacuum to me.
>
> Mike
>
> Drink wrote:
> >
> > Here's something I've pondered for years...
> > When I tune the Jeep, I have no measurable vacuum at idle. If I raise
the
> > RPM above idle around 1,000 and up (revving high), it shows plenty of
> > vacuum; 16 inches or so I think. I have a '76 258 with the ole' Carter
YF
> > carb with minimal emissions. In fact, the only thing I have is the
vacuum
> > advance ported from the carb, PCV to manifold, canister to manifold and
> > canister pulling vapor from around the bowl. The intake manifold ports
were
> > all plugged with bungs. I'm describing the plumbing from memory. So,
don't
> > quote me but I'm pretty sure that's it. The engine runs just fine
besides
> > being cold natured. but, it ain't a problem down here in Florida.
> > All the hoses are in fine shape and I can't find any leaks anywhere.
I've
> > torqued the manifolds and they've never leaked either through various
head
> > and manifold swaps. The carb's tight too. So, what's the deal with an
> > otherwise healthy engine that shows good compression. The distributor's
new
> > and I've ruled out a ruptured diaphragm. What could it be? Am I being
> > stupid and there shouldn't be any measured vacuum at idle?
> > o_o_o_o
> > Best Regards, /| ,[_____],
> > Jim, WP3JQ |ŻŻŻL --O|||||||O-
> > ()_)Ż()_) ŻŻŻŻŻ )_)
> > EM60qk 30.447439N 086.628959W
I have to ask, "Do I need it? What are the pros and cons?" I expect
someone's gonna tell me I have to have it. I know what it does but does
"lowering the combustion point" equate to power, mileage, cold
starting/driving?
Right now, it runs like crap but I need a cam. If I don't work the choke,
it bogs badly. I tuned it the other day and have timing, mixture and idle
set to factory. The stock settings make it run horribly.
o_o_o_o
Best Regards, /| ,[_____],
Jim, WP3JQ |ŻŻŻL --O|||||||O-
()_)Ż()_) ŻŻŻŻŻ )_)
EM60qk 30.447439N 086.628959W
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:403A0F4E.C8A15606@sympatico.ca...
> I just checked my book and it looks like you have 2 vacuum nipples. The
> bottom one is the 'spark' port and the upper one is the 'egr' port.
> That implies both are ported vacuum to me.
>
> Mike
>
> Drink wrote:
> >
> > Here's something I've pondered for years...
> > When I tune the Jeep, I have no measurable vacuum at idle. If I raise
the
> > RPM above idle around 1,000 and up (revving high), it shows plenty of
> > vacuum; 16 inches or so I think. I have a '76 258 with the ole' Carter
YF
> > carb with minimal emissions. In fact, the only thing I have is the
vacuum
> > advance ported from the carb, PCV to manifold, canister to manifold and
> > canister pulling vapor from around the bowl. The intake manifold ports
were
> > all plugged with bungs. I'm describing the plumbing from memory. So,
don't
> > quote me but I'm pretty sure that's it. The engine runs just fine
besides
> > being cold natured. but, it ain't a problem down here in Florida.
> > All the hoses are in fine shape and I can't find any leaks anywhere.
I've
> > torqued the manifolds and they've never leaked either through various
head
> > and manifold swaps. The carb's tight too. So, what's the deal with an
> > otherwise healthy engine that shows good compression. The distributor's
new
> > and I've ruled out a ruptured diaphragm. What could it be? Am I being
> > stupid and there shouldn't be any measured vacuum at idle?
> > o_o_o_o
> > Best Regards, /| ,[_____],
> > Jim, WP3JQ |ŻŻŻL --O|||||||O-
> > ()_)Ż()_) ŻŻŻŻŻ )_)
> > EM60qk 30.447439N 086.628959W
02-24-2004, 05:37 PM
#38
Guest
Posts: n/a
Re: No Measurable Vacuum at Idle???
My cam is shot and I've got to replace it (tapping valvetrain) but I wish
I could even imagine "lighting up" my 33's. You've got to have a really
light body with that fiberglass.
o_o_o_o
Best Regards, /| ,[_____],
Jim, WP3JQ |ŻŻŻL --O|||||||O-
()_)Ż()_) ŻŻŻŻŻ )_)
EM60qk 30.447439N 086.628959W
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:403A0CAD.20B29E9F@sympatico.ca...
> You are tagging a ported vacuum source.
>
> This gives you timing advance with rpm and in my opinion give the engine
> the best 'punch'.
>
> On the newer ones, they use a manifold vacuum to give the engine a
> smoother idle for the pollution sniffer and had a computer actually
> adjusting the timing advance.
>
> When I dumped the computer, I switched over to the ported advance. On
> manifold vacuum timing my engine has a dead spot when you punch the gas,
> it bogs down and slowly recovers.
>
> With the timing ported and a punch on the gas pedal, it just perks up
> and lights up my 33" mud tires in both 1st and 2nd and takes off like a
> scalded cat.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
>
> Drink wrote:
> >
> > Here's something I've pondered for years...
> > When I tune the Jeep, I have no measurable vacuum at idle. If I raise
the
> > RPM above idle around 1,000 and up (revving high), it shows plenty of
> > vacuum; 16 inches or so I think. I have a '76 258 with the ole' Carter
YF
> > carb with minimal emissions. In fact, the only thing I have is the
vacuum
> > advance ported from the carb, PCV to manifold, canister to manifold and
> > canister pulling vapor from around the bowl. The intake manifold ports
were
> > all plugged with bungs. I'm describing the plumbing from memory. So,
don't
> > quote me but I'm pretty sure that's it. The engine runs just fine
besides
> > being cold natured. but, it ain't a problem down here in Florida.
> > All the hoses are in fine shape and I can't find any leaks anywhere.
I've
> > torqued the manifolds and they've never leaked either through various
head
> > and manifold swaps. The carb's tight too. So, what's the deal with an
> > otherwise healthy engine that shows good compression. The distributor's
new
> > and I've ruled out a ruptured diaphragm. What could it be? Am I being
> > stupid and there shouldn't be any measured vacuum at idle?
> > o_o_o_o
> > Best Regards, /| ,[_____],
> > Jim, WP3JQ |ŻŻŻL --O|||||||O-
> > ()_)Ż()_) ŻŻŻŻŻ )_)
> > EM60qk 30.447439N 086.628959W
I could even imagine "lighting up" my 33's. You've got to have a really
light body with that fiberglass.
o_o_o_o
Best Regards, /| ,[_____],
Jim, WP3JQ |ŻŻŻL --O|||||||O-
()_)Ż()_) ŻŻŻŻŻ )_)
EM60qk 30.447439N 086.628959W
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:403A0CAD.20B29E9F@sympatico.ca...
> You are tagging a ported vacuum source.
>
> This gives you timing advance with rpm and in my opinion give the engine
> the best 'punch'.
>
> On the newer ones, they use a manifold vacuum to give the engine a
> smoother idle for the pollution sniffer and had a computer actually
> adjusting the timing advance.
>
> When I dumped the computer, I switched over to the ported advance. On
> manifold vacuum timing my engine has a dead spot when you punch the gas,
> it bogs down and slowly recovers.
>
> With the timing ported and a punch on the gas pedal, it just perks up
> and lights up my 33" mud tires in both 1st and 2nd and takes off like a
> scalded cat.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
>
> Drink wrote:
> >
> > Here's something I've pondered for years...
> > When I tune the Jeep, I have no measurable vacuum at idle. If I raise
the
> > RPM above idle around 1,000 and up (revving high), it shows plenty of
> > vacuum; 16 inches or so I think. I have a '76 258 with the ole' Carter
YF
> > carb with minimal emissions. In fact, the only thing I have is the
vacuum
> > advance ported from the carb, PCV to manifold, canister to manifold and
> > canister pulling vapor from around the bowl. The intake manifold ports
were
> > all plugged with bungs. I'm describing the plumbing from memory. So,
don't
> > quote me but I'm pretty sure that's it. The engine runs just fine
besides
> > being cold natured. but, it ain't a problem down here in Florida.
> > All the hoses are in fine shape and I can't find any leaks anywhere.
I've
> > torqued the manifolds and they've never leaked either through various
head
> > and manifold swaps. The carb's tight too. So, what's the deal with an
> > otherwise healthy engine that shows good compression. The distributor's
new
> > and I've ruled out a ruptured diaphragm. What could it be? Am I being
> > stupid and there shouldn't be any measured vacuum at idle?
> > o_o_o_o
> > Best Regards, /| ,[_____],
> > Jim, WP3JQ |ŻŻŻL --O|||||||O-
> > ()_)Ż()_) ŻŻŻŻŻ )_)
> > EM60qk 30.447439N 086.628959W
02-24-2004, 05:37 PM
#39
Guest
Posts: n/a
Re: No Measurable Vacuum at Idle???
My cam is shot and I've got to replace it (tapping valvetrain) but I wish
I could even imagine "lighting up" my 33's. You've got to have a really
light body with that fiberglass.
o_o_o_o
Best Regards, /| ,[_____],
Jim, WP3JQ |ŻŻŻL --O|||||||O-
()_)Ż()_) ŻŻŻŻŻ )_)
EM60qk 30.447439N 086.628959W
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:403A0CAD.20B29E9F@sympatico.ca...
> You are tagging a ported vacuum source.
>
> This gives you timing advance with rpm and in my opinion give the engine
> the best 'punch'.
>
> On the newer ones, they use a manifold vacuum to give the engine a
> smoother idle for the pollution sniffer and had a computer actually
> adjusting the timing advance.
>
> When I dumped the computer, I switched over to the ported advance. On
> manifold vacuum timing my engine has a dead spot when you punch the gas,
> it bogs down and slowly recovers.
>
> With the timing ported and a punch on the gas pedal, it just perks up
> and lights up my 33" mud tires in both 1st and 2nd and takes off like a
> scalded cat.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
>
> Drink wrote:
> >
> > Here's something I've pondered for years...
> > When I tune the Jeep, I have no measurable vacuum at idle. If I raise
the
> > RPM above idle around 1,000 and up (revving high), it shows plenty of
> > vacuum; 16 inches or so I think. I have a '76 258 with the ole' Carter
YF
> > carb with minimal emissions. In fact, the only thing I have is the
vacuum
> > advance ported from the carb, PCV to manifold, canister to manifold and
> > canister pulling vapor from around the bowl. The intake manifold ports
were
> > all plugged with bungs. I'm describing the plumbing from memory. So,
don't
> > quote me but I'm pretty sure that's it. The engine runs just fine
besides
> > being cold natured. but, it ain't a problem down here in Florida.
> > All the hoses are in fine shape and I can't find any leaks anywhere.
I've
> > torqued the manifolds and they've never leaked either through various
head
> > and manifold swaps. The carb's tight too. So, what's the deal with an
> > otherwise healthy engine that shows good compression. The distributor's
new
> > and I've ruled out a ruptured diaphragm. What could it be? Am I being
> > stupid and there shouldn't be any measured vacuum at idle?
> > o_o_o_o
> > Best Regards, /| ,[_____],
> > Jim, WP3JQ |ŻŻŻL --O|||||||O-
> > ()_)Ż()_) ŻŻŻŻŻ )_)
> > EM60qk 30.447439N 086.628959W
I could even imagine "lighting up" my 33's. You've got to have a really
light body with that fiberglass.
o_o_o_o
Best Regards, /| ,[_____],
Jim, WP3JQ |ŻŻŻL --O|||||||O-
()_)Ż()_) ŻŻŻŻŻ )_)
EM60qk 30.447439N 086.628959W
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:403A0CAD.20B29E9F@sympatico.ca...
> You are tagging a ported vacuum source.
>
> This gives you timing advance with rpm and in my opinion give the engine
> the best 'punch'.
>
> On the newer ones, they use a manifold vacuum to give the engine a
> smoother idle for the pollution sniffer and had a computer actually
> adjusting the timing advance.
>
> When I dumped the computer, I switched over to the ported advance. On
> manifold vacuum timing my engine has a dead spot when you punch the gas,
> it bogs down and slowly recovers.
>
> With the timing ported and a punch on the gas pedal, it just perks up
> and lights up my 33" mud tires in both 1st and 2nd and takes off like a
> scalded cat.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
>
> Drink wrote:
> >
> > Here's something I've pondered for years...
> > When I tune the Jeep, I have no measurable vacuum at idle. If I raise
the
> > RPM above idle around 1,000 and up (revving high), it shows plenty of
> > vacuum; 16 inches or so I think. I have a '76 258 with the ole' Carter
YF
> > carb with minimal emissions. In fact, the only thing I have is the
vacuum
> > advance ported from the carb, PCV to manifold, canister to manifold and
> > canister pulling vapor from around the bowl. The intake manifold ports
were
> > all plugged with bungs. I'm describing the plumbing from memory. So,
don't
> > quote me but I'm pretty sure that's it. The engine runs just fine
besides
> > being cold natured. but, it ain't a problem down here in Florida.
> > All the hoses are in fine shape and I can't find any leaks anywhere.
I've
> > torqued the manifolds and they've never leaked either through various
head
> > and manifold swaps. The carb's tight too. So, what's the deal with an
> > otherwise healthy engine that shows good compression. The distributor's
new
> > and I've ruled out a ruptured diaphragm. What could it be? Am I being
> > stupid and there shouldn't be any measured vacuum at idle?
> > o_o_o_o
> > Best Regards, /| ,[_____],
> > Jim, WP3JQ |ŻŻŻL --O|||||||O-
> > ()_)Ż()_) ŻŻŻŻŻ )_)
> > EM60qk 30.447439N 086.628959W
02-24-2004, 05:37 PM
#40
Guest
Posts: n/a
Re: No Measurable Vacuum at Idle???
My cam is shot and I've got to replace it (tapping valvetrain) but I wish
I could even imagine "lighting up" my 33's. You've got to have a really
light body with that fiberglass.
o_o_o_o
Best Regards, /| ,[_____],
Jim, WP3JQ |ŻŻŻL --O|||||||O-
()_)Ż()_) ŻŻŻŻŻ )_)
EM60qk 30.447439N 086.628959W
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:403A0CAD.20B29E9F@sympatico.ca...
> You are tagging a ported vacuum source.
>
> This gives you timing advance with rpm and in my opinion give the engine
> the best 'punch'.
>
> On the newer ones, they use a manifold vacuum to give the engine a
> smoother idle for the pollution sniffer and had a computer actually
> adjusting the timing advance.
>
> When I dumped the computer, I switched over to the ported advance. On
> manifold vacuum timing my engine has a dead spot when you punch the gas,
> it bogs down and slowly recovers.
>
> With the timing ported and a punch on the gas pedal, it just perks up
> and lights up my 33" mud tires in both 1st and 2nd and takes off like a
> scalded cat.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
>
> Drink wrote:
> >
> > Here's something I've pondered for years...
> > When I tune the Jeep, I have no measurable vacuum at idle. If I raise
the
> > RPM above idle around 1,000 and up (revving high), it shows plenty of
> > vacuum; 16 inches or so I think. I have a '76 258 with the ole' Carter
YF
> > carb with minimal emissions. In fact, the only thing I have is the
vacuum
> > advance ported from the carb, PCV to manifold, canister to manifold and
> > canister pulling vapor from around the bowl. The intake manifold ports
were
> > all plugged with bungs. I'm describing the plumbing from memory. So,
don't
> > quote me but I'm pretty sure that's it. The engine runs just fine
besides
> > being cold natured. but, it ain't a problem down here in Florida.
> > All the hoses are in fine shape and I can't find any leaks anywhere.
I've
> > torqued the manifolds and they've never leaked either through various
head
> > and manifold swaps. The carb's tight too. So, what's the deal with an
> > otherwise healthy engine that shows good compression. The distributor's
new
> > and I've ruled out a ruptured diaphragm. What could it be? Am I being
> > stupid and there shouldn't be any measured vacuum at idle?
> > o_o_o_o
> > Best Regards, /| ,[_____],
> > Jim, WP3JQ |ŻŻŻL --O|||||||O-
> > ()_)Ż()_) ŻŻŻŻŻ )_)
> > EM60qk 30.447439N 086.628959W
I could even imagine "lighting up" my 33's. You've got to have a really
light body with that fiberglass.
o_o_o_o
Best Regards, /| ,[_____],
Jim, WP3JQ |ŻŻŻL --O|||||||O-
()_)Ż()_) ŻŻŻŻŻ )_)
EM60qk 30.447439N 086.628959W
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:403A0CAD.20B29E9F@sympatico.ca...
> You are tagging a ported vacuum source.
>
> This gives you timing advance with rpm and in my opinion give the engine
> the best 'punch'.
>
> On the newer ones, they use a manifold vacuum to give the engine a
> smoother idle for the pollution sniffer and had a computer actually
> adjusting the timing advance.
>
> When I dumped the computer, I switched over to the ported advance. On
> manifold vacuum timing my engine has a dead spot when you punch the gas,
> it bogs down and slowly recovers.
>
> With the timing ported and a punch on the gas pedal, it just perks up
> and lights up my 33" mud tires in both 1st and 2nd and takes off like a
> scalded cat.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
>
> Drink wrote:
> >
> > Here's something I've pondered for years...
> > When I tune the Jeep, I have no measurable vacuum at idle. If I raise
the
> > RPM above idle around 1,000 and up (revving high), it shows plenty of
> > vacuum; 16 inches or so I think. I have a '76 258 with the ole' Carter
YF
> > carb with minimal emissions. In fact, the only thing I have is the
vacuum
> > advance ported from the carb, PCV to manifold, canister to manifold and
> > canister pulling vapor from around the bowl. The intake manifold ports
were
> > all plugged with bungs. I'm describing the plumbing from memory. So,
don't
> > quote me but I'm pretty sure that's it. The engine runs just fine
besides
> > being cold natured. but, it ain't a problem down here in Florida.
> > All the hoses are in fine shape and I can't find any leaks anywhere.
I've
> > torqued the manifolds and they've never leaked either through various
head
> > and manifold swaps. The carb's tight too. So, what's the deal with an
> > otherwise healthy engine that shows good compression. The distributor's
new
> > and I've ruled out a ruptured diaphragm. What could it be? Am I being
> > stupid and there shouldn't be any measured vacuum at idle?
> > o_o_o_o
> > Best Regards, /| ,[_____],
> > Jim, WP3JQ |ŻŻŻL --O|||||||O-
> > ()_)Ż()_) ŻŻŻŻŻ )_)
> > EM60qk 30.447439N 086.628959W
