No Measurable Vacuum at Idle???
#11
Guest
Posts: n/a
Re: No Measurable Vacuum at Idle???
Hey Jim,
I'm actually in the same situation of thoughts too at this time. I have a
'75 CJ5 258. 1 bbl Carter YF. If you have the same, maybe we can work
together on this. I have my distributor vacuum line connected to the
diagonal port on the carb which points toward cylinders 5 and 6. This port
only provides suction once the throttle body plate opens. I've considered
going direct to manifold vacuum, but don't know the pro's or con's. If got
my carb off right now for a needle/seat, rebuild and adjustment. If you
want, when I re-install it, I'll switch the vacuum lines around to check for
a difference.
--
Thanks Always !!!
Paul '75 CJ5 258
Vail, CO.
"Drink" <drink@gnt.net> wrote in message
news:c1bovc$g4m$1@news.utelfla.com...
> 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'm actually in the same situation of thoughts too at this time. I have a
'75 CJ5 258. 1 bbl Carter YF. If you have the same, maybe we can work
together on this. I have my distributor vacuum line connected to the
diagonal port on the carb which points toward cylinders 5 and 6. This port
only provides suction once the throttle body plate opens. I've considered
going direct to manifold vacuum, but don't know the pro's or con's. If got
my carb off right now for a needle/seat, rebuild and adjustment. If you
want, when I re-install it, I'll switch the vacuum lines around to check for
a difference.
--
Thanks Always !!!
Paul '75 CJ5 258
Vail, CO.
"Drink" <drink@gnt.net> wrote in message
news:c1bovc$g4m$1@news.utelfla.com...
> 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
>
>
#12
Guest
Posts: n/a
Re: No Measurable Vacuum at Idle???
Hey Jim,
I'm actually in the same situation of thoughts too at this time. I have a
'75 CJ5 258. 1 bbl Carter YF. If you have the same, maybe we can work
together on this. I have my distributor vacuum line connected to the
diagonal port on the carb which points toward cylinders 5 and 6. This port
only provides suction once the throttle body plate opens. I've considered
going direct to manifold vacuum, but don't know the pro's or con's. If got
my carb off right now for a needle/seat, rebuild and adjustment. If you
want, when I re-install it, I'll switch the vacuum lines around to check for
a difference.
--
Thanks Always !!!
Paul '75 CJ5 258
Vail, CO.
"Drink" <drink@gnt.net> wrote in message
news:c1bovc$g4m$1@news.utelfla.com...
> 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'm actually in the same situation of thoughts too at this time. I have a
'75 CJ5 258. 1 bbl Carter YF. If you have the same, maybe we can work
together on this. I have my distributor vacuum line connected to the
diagonal port on the carb which points toward cylinders 5 and 6. This port
only provides suction once the throttle body plate opens. I've considered
going direct to manifold vacuum, but don't know the pro's or con's. If got
my carb off right now for a needle/seat, rebuild and adjustment. If you
want, when I re-install it, I'll switch the vacuum lines around to check for
a difference.
--
Thanks Always !!!
Paul '75 CJ5 258
Vail, CO.
"Drink" <drink@gnt.net> wrote in message
news:c1bovc$g4m$1@news.utelfla.com...
> 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
>
>
#13
Guest
Posts: n/a
Re: No Measurable Vacuum at Idle???
Hey Jim,
I'm actually in the same situation of thoughts too at this time. I have a
'75 CJ5 258. 1 bbl Carter YF. If you have the same, maybe we can work
together on this. I have my distributor vacuum line connected to the
diagonal port on the carb which points toward cylinders 5 and 6. This port
only provides suction once the throttle body plate opens. I've considered
going direct to manifold vacuum, but don't know the pro's or con's. If got
my carb off right now for a needle/seat, rebuild and adjustment. If you
want, when I re-install it, I'll switch the vacuum lines around to check for
a difference.
--
Thanks Always !!!
Paul '75 CJ5 258
Vail, CO.
"Drink" <drink@gnt.net> wrote in message
news:c1bovc$g4m$1@news.utelfla.com...
> 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'm actually in the same situation of thoughts too at this time. I have a
'75 CJ5 258. 1 bbl Carter YF. If you have the same, maybe we can work
together on this. I have my distributor vacuum line connected to the
diagonal port on the carb which points toward cylinders 5 and 6. This port
only provides suction once the throttle body plate opens. I've considered
going direct to manifold vacuum, but don't know the pro's or con's. If got
my carb off right now for a needle/seat, rebuild and adjustment. If you
want, when I re-install it, I'll switch the vacuum lines around to check for
a difference.
--
Thanks Always !!!
Paul '75 CJ5 258
Vail, CO.
"Drink" <drink@gnt.net> wrote in message
news:c1bovc$g4m$1@news.utelfla.com...
> 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
>
>
#14
Guest
Posts: n/a
Re: No Measurable Vacuum at Idle???
Sounds good but I'm not sure we can collectively "fix" the YF:) I plugged
into the forward-most vacuum port because it showed more vacuum. Are you
gonna port straight into manifold? I'm curious to hear if some more
comments pop up so I'll know a little more for performance/efficiency
comparison.
o_o_o_o
Best Regards, /| ,[_____],
Jim, WP3JQ |ŻŻŻL --O|||||||O-
()_)Ż()_) ŻŻŻŻŻ )_)
EM60qk 30.447439N 086.628959W
"Paul Brogren" <pibrogren@msn.com> wrote in message
news:c1c1rq$1gg9r3$1@ID-190695.news.uni-berlin.de...
> Hey Jim,
> I'm actually in the same situation of thoughts too at this time. I have a
> '75 CJ5 258. 1 bbl Carter YF. If you have the same, maybe we can work
> together on this. I have my distributor vacuum line connected to the
> diagonal port on the carb which points toward cylinders 5 and 6. This
port
> only provides suction once the throttle body plate opens. I've considered
> going direct to manifold vacuum, but don't know the pro's or con's. If
got
> my carb off right now for a needle/seat, rebuild and adjustment. If you
> want, when I re-install it, I'll switch the vacuum lines around to check
for
> a difference.
>
> --
> Thanks Always !!!
> Paul '75 CJ5 258
> Vail, CO.
> "Drink" <drink@gnt.net> wrote in message
> news:c1bovc$g4m$1@news.utelfla.com...
> > 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
> >
> >
>
>
into the forward-most vacuum port because it showed more vacuum. Are you
gonna port straight into manifold? I'm curious to hear if some more
comments pop up so I'll know a little more for performance/efficiency
comparison.
o_o_o_o
Best Regards, /| ,[_____],
Jim, WP3JQ |ŻŻŻL --O|||||||O-
()_)Ż()_) ŻŻŻŻŻ )_)
EM60qk 30.447439N 086.628959W
"Paul Brogren" <pibrogren@msn.com> wrote in message
news:c1c1rq$1gg9r3$1@ID-190695.news.uni-berlin.de...
> Hey Jim,
> I'm actually in the same situation of thoughts too at this time. I have a
> '75 CJ5 258. 1 bbl Carter YF. If you have the same, maybe we can work
> together on this. I have my distributor vacuum line connected to the
> diagonal port on the carb which points toward cylinders 5 and 6. This
port
> only provides suction once the throttle body plate opens. I've considered
> going direct to manifold vacuum, but don't know the pro's or con's. If
got
> my carb off right now for a needle/seat, rebuild and adjustment. If you
> want, when I re-install it, I'll switch the vacuum lines around to check
for
> a difference.
>
> --
> Thanks Always !!!
> Paul '75 CJ5 258
> Vail, CO.
> "Drink" <drink@gnt.net> wrote in message
> news:c1bovc$g4m$1@news.utelfla.com...
> > 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
> >
> >
>
>
#15
Guest
Posts: n/a
Re: No Measurable Vacuum at Idle???
Sounds good but I'm not sure we can collectively "fix" the YF:) I plugged
into the forward-most vacuum port because it showed more vacuum. Are you
gonna port straight into manifold? I'm curious to hear if some more
comments pop up so I'll know a little more for performance/efficiency
comparison.
o_o_o_o
Best Regards, /| ,[_____],
Jim, WP3JQ |ŻŻŻL --O|||||||O-
()_)Ż()_) ŻŻŻŻŻ )_)
EM60qk 30.447439N 086.628959W
"Paul Brogren" <pibrogren@msn.com> wrote in message
news:c1c1rq$1gg9r3$1@ID-190695.news.uni-berlin.de...
> Hey Jim,
> I'm actually in the same situation of thoughts too at this time. I have a
> '75 CJ5 258. 1 bbl Carter YF. If you have the same, maybe we can work
> together on this. I have my distributor vacuum line connected to the
> diagonal port on the carb which points toward cylinders 5 and 6. This
port
> only provides suction once the throttle body plate opens. I've considered
> going direct to manifold vacuum, but don't know the pro's or con's. If
got
> my carb off right now for a needle/seat, rebuild and adjustment. If you
> want, when I re-install it, I'll switch the vacuum lines around to check
for
> a difference.
>
> --
> Thanks Always !!!
> Paul '75 CJ5 258
> Vail, CO.
> "Drink" <drink@gnt.net> wrote in message
> news:c1bovc$g4m$1@news.utelfla.com...
> > 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
> >
> >
>
>
into the forward-most vacuum port because it showed more vacuum. Are you
gonna port straight into manifold? I'm curious to hear if some more
comments pop up so I'll know a little more for performance/efficiency
comparison.
o_o_o_o
Best Regards, /| ,[_____],
Jim, WP3JQ |ŻŻŻL --O|||||||O-
()_)Ż()_) ŻŻŻŻŻ )_)
EM60qk 30.447439N 086.628959W
"Paul Brogren" <pibrogren@msn.com> wrote in message
news:c1c1rq$1gg9r3$1@ID-190695.news.uni-berlin.de...
> Hey Jim,
> I'm actually in the same situation of thoughts too at this time. I have a
> '75 CJ5 258. 1 bbl Carter YF. If you have the same, maybe we can work
> together on this. I have my distributor vacuum line connected to the
> diagonal port on the carb which points toward cylinders 5 and 6. This
port
> only provides suction once the throttle body plate opens. I've considered
> going direct to manifold vacuum, but don't know the pro's or con's. If
got
> my carb off right now for a needle/seat, rebuild and adjustment. If you
> want, when I re-install it, I'll switch the vacuum lines around to check
for
> a difference.
>
> --
> Thanks Always !!!
> Paul '75 CJ5 258
> Vail, CO.
> "Drink" <drink@gnt.net> wrote in message
> news:c1bovc$g4m$1@news.utelfla.com...
> > 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
> >
> >
>
>
#16
Guest
Posts: n/a
Re: No Measurable Vacuum at Idle???
Sounds good but I'm not sure we can collectively "fix" the YF:) I plugged
into the forward-most vacuum port because it showed more vacuum. Are you
gonna port straight into manifold? I'm curious to hear if some more
comments pop up so I'll know a little more for performance/efficiency
comparison.
o_o_o_o
Best Regards, /| ,[_____],
Jim, WP3JQ |ŻŻŻL --O|||||||O-
()_)Ż()_) ŻŻŻŻŻ )_)
EM60qk 30.447439N 086.628959W
"Paul Brogren" <pibrogren@msn.com> wrote in message
news:c1c1rq$1gg9r3$1@ID-190695.news.uni-berlin.de...
> Hey Jim,
> I'm actually in the same situation of thoughts too at this time. I have a
> '75 CJ5 258. 1 bbl Carter YF. If you have the same, maybe we can work
> together on this. I have my distributor vacuum line connected to the
> diagonal port on the carb which points toward cylinders 5 and 6. This
port
> only provides suction once the throttle body plate opens. I've considered
> going direct to manifold vacuum, but don't know the pro's or con's. If
got
> my carb off right now for a needle/seat, rebuild and adjustment. If you
> want, when I re-install it, I'll switch the vacuum lines around to check
for
> a difference.
>
> --
> Thanks Always !!!
> Paul '75 CJ5 258
> Vail, CO.
> "Drink" <drink@gnt.net> wrote in message
> news:c1bovc$g4m$1@news.utelfla.com...
> > 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
> >
> >
>
>
into the forward-most vacuum port because it showed more vacuum. Are you
gonna port straight into manifold? I'm curious to hear if some more
comments pop up so I'll know a little more for performance/efficiency
comparison.
o_o_o_o
Best Regards, /| ,[_____],
Jim, WP3JQ |ŻŻŻL --O|||||||O-
()_)Ż()_) ŻŻŻŻŻ )_)
EM60qk 30.447439N 086.628959W
"Paul Brogren" <pibrogren@msn.com> wrote in message
news:c1c1rq$1gg9r3$1@ID-190695.news.uni-berlin.de...
> Hey Jim,
> I'm actually in the same situation of thoughts too at this time. I have a
> '75 CJ5 258. 1 bbl Carter YF. If you have the same, maybe we can work
> together on this. I have my distributor vacuum line connected to the
> diagonal port on the carb which points toward cylinders 5 and 6. This
port
> only provides suction once the throttle body plate opens. I've considered
> going direct to manifold vacuum, but don't know the pro's or con's. If
got
> my carb off right now for a needle/seat, rebuild and adjustment. If you
> want, when I re-install it, I'll switch the vacuum lines around to check
for
> a difference.
>
> --
> Thanks Always !!!
> Paul '75 CJ5 258
> Vail, CO.
> "Drink" <drink@gnt.net> wrote in message
> news:c1bovc$g4m$1@news.utelfla.com...
> > 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
> >
> >
>
>
#17
Guest
Posts: n/a
Re: No Measurable Vacuum at Idle???
Hmm. I might be stuck and this is the only configuration. I've a YF,
1Bbl carburetor. If I really wanted to, I suppose there's more than one way
to get manifold vacuum; just to see what pros/cons it gives. How much would
you offer for a Carter BBD, 2 Bbl carburetor (used)?
o_o_o_o
Best Regards, /| ,[_____],
Jim, WP3JQ |ŻŻŻL --O|||||||O-
()_)Ż()_) ŻŻŻŻŻ )_)
EM60qk 30.447439N 086.628959W
"L.W. (ßill) ------ III" <----------@***.net> wrote in message
news:40397D52.FF7AC4BE@***.net...
> I know I'll get an argument out of Mike Romain here, but manifold
> vacuum will get you a better idle and fuel mileage. Try the port over
> the number 59 in this view:
> http://www.carburetorfactory.com/expvw03.html You might go around it
> tightening all the screws, because it should have been easy for you to
> find full vacuum, virtually all of them other than the venturi one.
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Drink wrote:
> >
> > You lost me, I think, about where to connect vacuum advance. From the
> > passenger side, there are two vacuum ports. At the base, where I'm
> > connecting distributor vacuum, is all the way down on the right. About
3/4
> > inch higher, to the left is the other. I checked vacuum at both and
neither
> > presents measurable vacuum but the lower (my connection) provides more
> > vacuum at RPM. So, where do you connect?
> > What benefit do you get by connecting your way? It seems backwards
until
> > much higher RPM since you have vacuum advance at idle and then no
advance
> > upon acceleration. At rev, it sounds like vacuum catches up and you're
back
> > to where you want to be.
> > o_o_o_o
> > Best Regards, /| ,[_____],
> > Jim, WP3JQ |ŻŻŻL --O|||||||O-
> > ()_)Ż()_) ŻŻŻŻŻ )_)
> > EM60qk 30.447439N 086.628959W
> > "L.W. (ßill) ------ III" <----------@***.net> wrote in message
> > news:40396F0C.E76FCBD5@***.net...
> > > That's normal and is the venturi vacuum port, the stock and what
> > > Mike here likes to hook the distributor diaphragm to, that advances
the
> > > timing as the engine increases in revolutions per minute. You find
full
> > > manifold vacuum down at the butterfly throttle plates about fifteen
> > > inches of mercury at idle. This port I favor for full advance at idle
> > > (makes for smooth idle) yet instantly retards for torque when you
stick
> > > it, and gradually advances with the centrifugal weights to reach full
> > > advance together somewhere between two and three grand.
> > > God Bless America, ßill O|||||||O
> > > mailto:-------------------- http://www.----------.com/
> > >
> > > 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
1Bbl carburetor. If I really wanted to, I suppose there's more than one way
to get manifold vacuum; just to see what pros/cons it gives. How much would
you offer for a Carter BBD, 2 Bbl carburetor (used)?
o_o_o_o
Best Regards, /| ,[_____],
Jim, WP3JQ |ŻŻŻL --O|||||||O-
()_)Ż()_) ŻŻŻŻŻ )_)
EM60qk 30.447439N 086.628959W
"L.W. (ßill) ------ III" <----------@***.net> wrote in message
news:40397D52.FF7AC4BE@***.net...
> I know I'll get an argument out of Mike Romain here, but manifold
> vacuum will get you a better idle and fuel mileage. Try the port over
> the number 59 in this view:
> http://www.carburetorfactory.com/expvw03.html You might go around it
> tightening all the screws, because it should have been easy for you to
> find full vacuum, virtually all of them other than the venturi one.
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Drink wrote:
> >
> > You lost me, I think, about where to connect vacuum advance. From the
> > passenger side, there are two vacuum ports. At the base, where I'm
> > connecting distributor vacuum, is all the way down on the right. About
3/4
> > inch higher, to the left is the other. I checked vacuum at both and
neither
> > presents measurable vacuum but the lower (my connection) provides more
> > vacuum at RPM. So, where do you connect?
> > What benefit do you get by connecting your way? It seems backwards
until
> > much higher RPM since you have vacuum advance at idle and then no
advance
> > upon acceleration. At rev, it sounds like vacuum catches up and you're
back
> > to where you want to be.
> > o_o_o_o
> > Best Regards, /| ,[_____],
> > Jim, WP3JQ |ŻŻŻL --O|||||||O-
> > ()_)Ż()_) ŻŻŻŻŻ )_)
> > EM60qk 30.447439N 086.628959W
> > "L.W. (ßill) ------ III" <----------@***.net> wrote in message
> > news:40396F0C.E76FCBD5@***.net...
> > > That's normal and is the venturi vacuum port, the stock and what
> > > Mike here likes to hook the distributor diaphragm to, that advances
the
> > > timing as the engine increases in revolutions per minute. You find
full
> > > manifold vacuum down at the butterfly throttle plates about fifteen
> > > inches of mercury at idle. This port I favor for full advance at idle
> > > (makes for smooth idle) yet instantly retards for torque when you
stick
> > > it, and gradually advances with the centrifugal weights to reach full
> > > advance together somewhere between two and three grand.
> > > God Bless America, ßill O|||||||O
> > > mailto:-------------------- http://www.----------.com/
> > >
> > > 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
#18
Guest
Posts: n/a
Re: No Measurable Vacuum at Idle???
Hmm. I might be stuck and this is the only configuration. I've a YF,
1Bbl carburetor. If I really wanted to, I suppose there's more than one way
to get manifold vacuum; just to see what pros/cons it gives. How much would
you offer for a Carter BBD, 2 Bbl carburetor (used)?
o_o_o_o
Best Regards, /| ,[_____],
Jim, WP3JQ |ŻŻŻL --O|||||||O-
()_)Ż()_) ŻŻŻŻŻ )_)
EM60qk 30.447439N 086.628959W
"L.W. (ßill) ------ III" <----------@***.net> wrote in message
news:40397D52.FF7AC4BE@***.net...
> I know I'll get an argument out of Mike Romain here, but manifold
> vacuum will get you a better idle and fuel mileage. Try the port over
> the number 59 in this view:
> http://www.carburetorfactory.com/expvw03.html You might go around it
> tightening all the screws, because it should have been easy for you to
> find full vacuum, virtually all of them other than the venturi one.
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Drink wrote:
> >
> > You lost me, I think, about where to connect vacuum advance. From the
> > passenger side, there are two vacuum ports. At the base, where I'm
> > connecting distributor vacuum, is all the way down on the right. About
3/4
> > inch higher, to the left is the other. I checked vacuum at both and
neither
> > presents measurable vacuum but the lower (my connection) provides more
> > vacuum at RPM. So, where do you connect?
> > What benefit do you get by connecting your way? It seems backwards
until
> > much higher RPM since you have vacuum advance at idle and then no
advance
> > upon acceleration. At rev, it sounds like vacuum catches up and you're
back
> > to where you want to be.
> > o_o_o_o
> > Best Regards, /| ,[_____],
> > Jim, WP3JQ |ŻŻŻL --O|||||||O-
> > ()_)Ż()_) ŻŻŻŻŻ )_)
> > EM60qk 30.447439N 086.628959W
> > "L.W. (ßill) ------ III" <----------@***.net> wrote in message
> > news:40396F0C.E76FCBD5@***.net...
> > > That's normal and is the venturi vacuum port, the stock and what
> > > Mike here likes to hook the distributor diaphragm to, that advances
the
> > > timing as the engine increases in revolutions per minute. You find
full
> > > manifold vacuum down at the butterfly throttle plates about fifteen
> > > inches of mercury at idle. This port I favor for full advance at idle
> > > (makes for smooth idle) yet instantly retards for torque when you
stick
> > > it, and gradually advances with the centrifugal weights to reach full
> > > advance together somewhere between two and three grand.
> > > God Bless America, ßill O|||||||O
> > > mailto:-------------------- http://www.----------.com/
> > >
> > > 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
1Bbl carburetor. If I really wanted to, I suppose there's more than one way
to get manifold vacuum; just to see what pros/cons it gives. How much would
you offer for a Carter BBD, 2 Bbl carburetor (used)?
o_o_o_o
Best Regards, /| ,[_____],
Jim, WP3JQ |ŻŻŻL --O|||||||O-
()_)Ż()_) ŻŻŻŻŻ )_)
EM60qk 30.447439N 086.628959W
"L.W. (ßill) ------ III" <----------@***.net> wrote in message
news:40397D52.FF7AC4BE@***.net...
> I know I'll get an argument out of Mike Romain here, but manifold
> vacuum will get you a better idle and fuel mileage. Try the port over
> the number 59 in this view:
> http://www.carburetorfactory.com/expvw03.html You might go around it
> tightening all the screws, because it should have been easy for you to
> find full vacuum, virtually all of them other than the venturi one.
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Drink wrote:
> >
> > You lost me, I think, about where to connect vacuum advance. From the
> > passenger side, there are two vacuum ports. At the base, where I'm
> > connecting distributor vacuum, is all the way down on the right. About
3/4
> > inch higher, to the left is the other. I checked vacuum at both and
neither
> > presents measurable vacuum but the lower (my connection) provides more
> > vacuum at RPM. So, where do you connect?
> > What benefit do you get by connecting your way? It seems backwards
until
> > much higher RPM since you have vacuum advance at idle and then no
advance
> > upon acceleration. At rev, it sounds like vacuum catches up and you're
back
> > to where you want to be.
> > o_o_o_o
> > Best Regards, /| ,[_____],
> > Jim, WP3JQ |ŻŻŻL --O|||||||O-
> > ()_)Ż()_) ŻŻŻŻŻ )_)
> > EM60qk 30.447439N 086.628959W
> > "L.W. (ßill) ------ III" <----------@***.net> wrote in message
> > news:40396F0C.E76FCBD5@***.net...
> > > That's normal and is the venturi vacuum port, the stock and what
> > > Mike here likes to hook the distributor diaphragm to, that advances
the
> > > timing as the engine increases in revolutions per minute. You find
full
> > > manifold vacuum down at the butterfly throttle plates about fifteen
> > > inches of mercury at idle. This port I favor for full advance at idle
> > > (makes for smooth idle) yet instantly retards for torque when you
stick
> > > it, and gradually advances with the centrifugal weights to reach full
> > > advance together somewhere between two and three grand.
> > > God Bless America, ßill O|||||||O
> > > mailto:-------------------- http://www.----------.com/
> > >
> > > 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
#19
Guest
Posts: n/a
Re: No Measurable Vacuum at Idle???
Hmm. I might be stuck and this is the only configuration. I've a YF,
1Bbl carburetor. If I really wanted to, I suppose there's more than one way
to get manifold vacuum; just to see what pros/cons it gives. How much would
you offer for a Carter BBD, 2 Bbl carburetor (used)?
o_o_o_o
Best Regards, /| ,[_____],
Jim, WP3JQ |ŻŻŻL --O|||||||O-
()_)Ż()_) ŻŻŻŻŻ )_)
EM60qk 30.447439N 086.628959W
"L.W. (ßill) ------ III" <----------@***.net> wrote in message
news:40397D52.FF7AC4BE@***.net...
> I know I'll get an argument out of Mike Romain here, but manifold
> vacuum will get you a better idle and fuel mileage. Try the port over
> the number 59 in this view:
> http://www.carburetorfactory.com/expvw03.html You might go around it
> tightening all the screws, because it should have been easy for you to
> find full vacuum, virtually all of them other than the venturi one.
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Drink wrote:
> >
> > You lost me, I think, about where to connect vacuum advance. From the
> > passenger side, there are two vacuum ports. At the base, where I'm
> > connecting distributor vacuum, is all the way down on the right. About
3/4
> > inch higher, to the left is the other. I checked vacuum at both and
neither
> > presents measurable vacuum but the lower (my connection) provides more
> > vacuum at RPM. So, where do you connect?
> > What benefit do you get by connecting your way? It seems backwards
until
> > much higher RPM since you have vacuum advance at idle and then no
advance
> > upon acceleration. At rev, it sounds like vacuum catches up and you're
back
> > to where you want to be.
> > o_o_o_o
> > Best Regards, /| ,[_____],
> > Jim, WP3JQ |ŻŻŻL --O|||||||O-
> > ()_)Ż()_) ŻŻŻŻŻ )_)
> > EM60qk 30.447439N 086.628959W
> > "L.W. (ßill) ------ III" <----------@***.net> wrote in message
> > news:40396F0C.E76FCBD5@***.net...
> > > That's normal and is the venturi vacuum port, the stock and what
> > > Mike here likes to hook the distributor diaphragm to, that advances
the
> > > timing as the engine increases in revolutions per minute. You find
full
> > > manifold vacuum down at the butterfly throttle plates about fifteen
> > > inches of mercury at idle. This port I favor for full advance at idle
> > > (makes for smooth idle) yet instantly retards for torque when you
stick
> > > it, and gradually advances with the centrifugal weights to reach full
> > > advance together somewhere between two and three grand.
> > > God Bless America, ßill O|||||||O
> > > mailto:-------------------- http://www.----------.com/
> > >
> > > 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
1Bbl carburetor. If I really wanted to, I suppose there's more than one way
to get manifold vacuum; just to see what pros/cons it gives. How much would
you offer for a Carter BBD, 2 Bbl carburetor (used)?
o_o_o_o
Best Regards, /| ,[_____],
Jim, WP3JQ |ŻŻŻL --O|||||||O-
()_)Ż()_) ŻŻŻŻŻ )_)
EM60qk 30.447439N 086.628959W
"L.W. (ßill) ------ III" <----------@***.net> wrote in message
news:40397D52.FF7AC4BE@***.net...
> I know I'll get an argument out of Mike Romain here, but manifold
> vacuum will get you a better idle and fuel mileage. Try the port over
> the number 59 in this view:
> http://www.carburetorfactory.com/expvw03.html You might go around it
> tightening all the screws, because it should have been easy for you to
> find full vacuum, virtually all of them other than the venturi one.
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Drink wrote:
> >
> > You lost me, I think, about where to connect vacuum advance. From the
> > passenger side, there are two vacuum ports. At the base, where I'm
> > connecting distributor vacuum, is all the way down on the right. About
3/4
> > inch higher, to the left is the other. I checked vacuum at both and
neither
> > presents measurable vacuum but the lower (my connection) provides more
> > vacuum at RPM. So, where do you connect?
> > What benefit do you get by connecting your way? It seems backwards
until
> > much higher RPM since you have vacuum advance at idle and then no
advance
> > upon acceleration. At rev, it sounds like vacuum catches up and you're
back
> > to where you want to be.
> > o_o_o_o
> > Best Regards, /| ,[_____],
> > Jim, WP3JQ |ŻŻŻL --O|||||||O-
> > ()_)Ż()_) ŻŻŻŻŻ )_)
> > EM60qk 30.447439N 086.628959W
> > "L.W. (ßill) ------ III" <----------@***.net> wrote in message
> > news:40396F0C.E76FCBD5@***.net...
> > > That's normal and is the venturi vacuum port, the stock and what
> > > Mike here likes to hook the distributor diaphragm to, that advances
the
> > > timing as the engine increases in revolutions per minute. You find
full
> > > manifold vacuum down at the butterfly throttle plates about fifteen
> > > inches of mercury at idle. This port I favor for full advance at idle
> > > (makes for smooth idle) yet instantly retards for torque when you
stick
> > > it, and gradually advances with the centrifugal weights to reach full
> > > advance together somewhere between two and three grand.
> > > God Bless America, ßill O|||||||O
> > > mailto:-------------------- http://www.----------.com/
> > >
> > > 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
#20
Guest
Posts: n/a
Re: No Measurable Vacuum at Idle???
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
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