*Normal* vacuum at idle??
01-15-2002, 12:58 AM
#2
Le Mans Master
Member Since: Aug 2000
Location: Semper ubi, sub ubi
Posts: 9,662
Likes: 0
Received 6 Likes
on
6 Posts
Cruise-In VI Veteran
Cruise-In VII Veteran
Re: *Normal* vacuum at idle?? (Gameshow Bob)
10 is a little low, but your XE274 does have pretty fair lift and duration, that is sure to drop your idle vacuum somewhat. I think 18-20 is considered normal, but normal is what you get with a really dinky cam in a family sedan.
You might check and make sure that all your vacuum lines are in good shape, you might even want to plug everything except the manifold vacuum port you are checking vacuum through. If you vacuum goes up considerably then you probably have a leak somewhere.
You might check and make sure that all your vacuum lines are in good shape, you might even want to plug everything except the manifold vacuum port you are checking vacuum through. If you vacuum goes up considerably then you probably have a leak somewhere.
01-15-2002, 01:10 AM
#3
Racer
Thread Starter
Member Since: Jun 2001
Location: Fort Collins CO
Posts: 305
Likes: 0
Received 0 Likes
on
0 Posts
Re: *Normal* vacuum at idle?? (Smokehouse69)
I'm fairly certain i have a few leaks. . . but I just wanted to make sure someone didnt wonder how my car is idling at all. . . :rolleyes: I do have some idling issues that im trying to work out and figured id start with the vacuum. I'm going to get a timing light next and then maybe an o2 sensor. From the smell of things (rich) I'm not going to pass my emission check come next inspection time (march).
01-15-2002, 02:58 AM
#5
Melting Slicks
Member Since: Apr 2001
Location: colorado springs CO
Posts: 2,280
Likes: 0
Received 0 Likes
on
0 Posts
Re: *Normal* vacuum at idle?? (daily_driver)
ive got 21...
(with a 3 inch element...)
but like he says above.... my cam is stock... not quite a family sedan :lol: :lol:
i can still get up and go with the rest of them.... 2101 intake...true duals...headers..+ a few other suprises....
(with a 3 inch element...)
but like he says above.... my cam is stock... not quite a family sedan :lol: :lol:
i can still get up and go with the rest of them.... 2101 intake...true duals...headers..+ a few other suprises....
01-15-2002, 03:09 AM
#6
Racer
Thread Starter
Member Since: Jun 2001
Location: Fort Collins CO
Posts: 305
Likes: 0
Received 0 Likes
on
0 Posts
Re: *Normal* vacuum at idle?? (daily_driver)
Har Har :lol: I think my timing is sufficiently screwed up currently that the throttle is open way too much for idle. If that is the case that would also explain this really lame run-on problem im experiencing that's just down right embarassing sometimes. Of course it could just be my carb sucking. I have yet to fix the secondaries getting stuck open problem I first noticed a few months ago. Im just good at getting them un stuck by tapping on the pedal a bit now :D Hopefully tomorrow's compression check won't tell me that I need a rebuild or anything like that. Maybe when I switch over to fuel injection that will solve all of my problems. Anyone know about Accel DFI systems?
01-15-2002, 09:56 AM
#8
Drifting
Member Since: Sep 1999
Location: Wylie TX
Posts: 1,411
Likes: 0
Received 0 Likes
on
0 Posts
Re: *Normal* vacuum at idle??
I've got 15" at 750 RPM with my XR274 cam (which is the solid roller version of the XE274). Also, mine is in a 383, so the extra cubes may help as well.
01-15-2002, 10:15 AM
#9
Drifting
Re: *Normal* vacuum at idle?? (Gameshow Bob)
I've got 9" at idle...
Oh, and my power accessories (headlights, wipers, brakes) work great.
[Modified by rainman69, 9:38 AM 1/15/2002]
Oh, and my power accessories (headlights, wipers, brakes) work great.
[Modified by rainman69, 9:38 AM 1/15/2002]
01-15-2002, 03:57 PM
#11
Melting Slicks
Member Since: Apr 2001
Location: colorado springs CO
Posts: 2,280
Likes: 0
Received 0 Likes
on
0 Posts
Re: *Normal* vacuum at idle?? (Gameshow Bob)
Har Har :lol: I think my timing is sufficiently screwed up currently that the throttle is open way too much for idle. If that is the case that would also explain this really lame run-on problem im experiencing that's just down right embarassing sometimes. Of course it could just be my carb sucking. I have yet to fix the secondaries getting stuck open problem I first noticed a few months ago. Im just good at getting them un stuck by tapping on the pedal a bit now :D Hopefully tomorrow's compression check won't tell me that I need a rebuild or anything like that. Maybe when I switch over to fuel injection that will solve all of my problems. Anyone know about Accel DFI systems?
i used to have a firechicken that would run on...
dont u hate when u drive upto a 7 eleven or other store and theres people standing out side.... and you shut your car off and it keeps on goin..
chuuung chuuug chuuug chuuuuuuuuuuuuuuuuuug chuuug..
:lol: :lol: :jester :jester :jester
that sux!!
everyone stares at you!!
especially if its a vette that does it !!
01-15-2002, 10:07 PM
#14
Instructor
Member Since: Oct 2001
Location: Kingston Tn
Posts: 216
Likes: 0
Received 0 Likes
on
0 Posts
Re: *Normal* vacuum at idle?? (pats406nitrovette)
.....Pat gives us time and temperature in Atlantic City! Cool. Next he's going to tell us who is going to win the Superbowl!
My vacum at idle (after warm up) is 18-20. I bumped it up to 30 once, but it didn't stop the T-tops from squeaking! Regards all
'74 Turbocharged 350, "Molested to Perfection," class of '71
[Modified by Shutdown1, 2:08 AM 1/16/2002]
My vacum at idle (after warm up) is 18-20. I bumped it up to 30 once, but it didn't stop the T-tops from squeaking! Regards all
'74 Turbocharged 350, "Molested to Perfection," class of '71
[Modified by Shutdown1, 2:08 AM 1/16/2002]
