Checking Vaccum
Thread Starter
Race Director
Joined: Feb 1999
Posts: 19,659
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From: Lenoir City Tennessee
Ci 6, 8 & 10 Veteran
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15
Checking Vaccum
I was checking to see how much engine vaccum I have at idle and the needle on the gauge bounces about 2 to 3 pounds. What could cause this. I have read elsewhere that it could be running to rich or to lean. Hopefully that is all there is to it. I do have a slight stumble sometimes when just touching the gas while cruising at slow speed.
Thanks for any help.
Thanks for any help.
Race Director
Joined: Sep 2002
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From: San Diego - Deep Within The State of CONFUSION!
Re: Checking Vaccum (Eddie 70)
Hmmm. If it is indeed vacuum you're talking about that's measured in inches. Now, a flutter of 2-3 inches of vacuum is not severe, but not good. It indicates valve issues. How many miles on the motor?
Drifting
Joined: Feb 2000
Posts: 1,607
Likes: 0
From: Clarksville,Tn,USA TN
Re: Checking Vaccum (SanDiegoPaul)
Mind explaining just how you checked the vacuum and where you hooked too and ect.. is it bouncing 2-3 inches from a set value like 15 to 18 inches?
Neil in Tenn
[Modified by Nomad78SA, 7:17 PM 4/26/2003]
Neil in Tenn
[Modified by Nomad78SA, 7:17 PM 4/26/2003]
Thread Starter
Race Director
Joined: Feb 1999
Posts: 19,659
Likes: 34
From: Lenoir City Tennessee
Ci 6, 8 & 10 Veteran
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15
Re: Checking Vaccum (Nomad78SA)
I checked the vaccum at the full vaccum port at the front of my Holley Street Avenger. It is just flutter between like 14 to 16 inches at 650RPM.
Just another Corvette guy
Joined: Feb 1999
Posts: 8,518
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From: Palm Springs, CA.
Re: Checking Vaccum (Eddie 70)
Hey Eddie,
18-20 inches of vacuum is ideal for a stock set up, but from the looks of the intake and other mods to that stove, 14-16 is pretty good. A two inch bounce wouldn't concern me.
Greg
18-20 inches of vacuum is ideal for a stock set up, but from the looks of the intake and other mods to that stove, 14-16 is pretty good. A two inch bounce wouldn't concern me.
Greg
