C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

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Oct 14, 2005 | 01:46 AM

#21

smacko

Burning Brakes

Joined: Jul 2003

Posts: 922

Likes: 1

From: Brisbane Queensland, Australia

Quote:

Originally Posted by Kwik88

If you use a hand vacuum pump to test the egr and it holds vacuum, why is it that when you bump the starter the vacuum disappears from the hand pump? I've asked this question before and know one seems to know why.

Are u after a guess? If so - Because as the engine (and pistons) rotate, the vacuum levels change...Think also 'suck-push' 'suck-push'...It's a vacuum pump in itself, is it not? - Except with a one way valve

Last edited by smacko; Oct 14, 2005 at 01:47 AM. Reason: PS

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