How much engine vaccum please help

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Mar 30, 2007 | 02:40 PM

YoMilkMan

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Joined: Nov 2005

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From: VA

How much engine vaccum please help

hi all
How much engine vac does a pretty stock tpi normally have. I just bought a FP and VAC gauge all in one.

thank You

88TPI

Mar 30, 2007 | 04:05 PM

toptechx6

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Joined: Jun 2006

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From: FL

My stock 93 LT1 pulls close to 21" at idle, if you have a hotter cam it will be quite a bit lower.

Mar 30, 2007 | 06:38 PM

sami85L98

Le Mans Master

Joined: Apr 2005

Posts: 8,077

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From: Scarborough ONTARIO

U might be intersted in how to read vacum gauge:

http://www.secondchancegarage.com/public/186.cfm

mine is a highly modded holds very steady 17.5.

Mar 30, 2007 | 06:45 PM

Pete K

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Altitude affects vacuum as well. I believe you lose 1 inch of vacuum for every 1000 feet that you climb.

Apr 3, 2007 | 01:11 PM

YoMilkMan

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From: VA

great thanks everyone

Apr 3, 2007 | 05:08 PM

Corvette Kid

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From: Good health is merely the slowest possible rate at which one can die

St. Jude Donor '04-'05-'06-'07

Quote:

Originally Posted by toptechx6

My stock 93 LT1 pulls close to 21" at idle, if you have a hotter cam it will be quite a bit lower.

21 in. Hg is pretty standard for healthy, stock automobile engines.

Apr 3, 2007 | 05:32 PM

Red Tornado

Team Owner

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From: OBAMA IS HITLER

i'm actually a bit below sea level, the last time i put a gage on it read 16".

Apr 3, 2007 | 05:34 PM

Pete K

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Brad,
16 is good for a 219 cam. I make about 13. My idle speed is stock though. Bumping up my idle to 800 rpm will likely add to the vacuum reading.

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Apr 3, 2007 | 05:36 PM

Red Tornado

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From: OBAMA IS HITLER

Pete, yes, I had my idle bumped by Alvin to 850.

I must make a correction. Where I live, we're actually about 450 feet above sea level. Pete, you're about 550.

http://www.topozone.com/

Last edited by Red Tornado; Apr 3, 2007 at 05:41 PM.

Apr 3, 2007 | 07:26 PM

#10

kopbet89c4

Safety Car

Joined: Dec 2004

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From: Poop land

I have 20" of vacuum at a 600 rpm idle.

Apr 4, 2007 | 11:18 AM

#11

tequilaboy

Melting Slicks

Joined: Aug 2003

Posts: 3,389

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From: Lakeville MI

14-15" here. Comp 503 cam, 850 rpm, 32 degrees advance at 800 rpm.

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