Vacuum source
Thread Starter
Burning Brakes
Joined: Dec 2002
Posts: 1,069
Likes: 2
From: Sherwood Park AB
Vacuum source
The guy at the speed shop told me to try to use the vacuum source on the Q-jet rather than the one on the intake manifold (for the headlights). He said if you take vacuum off the manifold, it leans out that one cylinder.
What do you guys think? Is there another vacuum source on the Q-jet?
What do you guys think? Is there another vacuum source on the Q-jet?
Safety Car
Joined: Aug 2000
Posts: 3,711
Likes: 43
From: San Antonio TX
Re: Vacuum source (rexx78)
The guy is on drugs and ignorant. A vacuum tap on the manifold has access to the vacuum signal from all the cylinders sharing that manifold path. You can verify this for yourself by hooking up a vacuum gauge to the tap. If the vacuum is steady, it's a common source but that's not at all in doubt here. If you put a vacuum gauge on an individual runner motorcycle carb, you'll have wild fluctuations in the gauge at idle. Time to go learn that speed shop guy.
Racer
Joined: Jan 2004
Posts: 263
Likes: 1
From: 20,000 leagues under the sea
Re: Vacuum source (rexx78)
The only way a vacuum source will lean out anything is if you have a leak in your vacuum system, which also means they won't work either.
[Modified by 68raggtop, 10:28 AM 3/12/2004]
[Modified by 68raggtop, 10:28 AM 3/12/2004]
Safety Car
Joined: Jan 2000
Posts: 4,143
Likes: 0
Re: Vacuum source (gerry72)
The guy is on drugs and ignorant. A vacuum tap on the manifold has access to the vacuum signal from all the cylinders sharing that manifold path. You can verify this for yourself by hooking up a vacuum gauge to the tap. If the vacuum is steady, it's a common source but that's not at all in doubt here. If you put a vacuum gauge on an individual runner motorcycle carb, you'll have wild fluctuations in the gauge at idle. Time to go learn that speed shop guy.
Of course these guys always think they know more than the Chevrolet Engineers. :lol:
