Team Camaro Tech - View Single Post - Timing & Vacuum Advance 101
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post #16 of (permalink) Old Jul 6th, 10, 08:22 PM
Senior Tech
Join Date: Dec 2003
Location: Leander, TX
Posts: 2,758
Re: Timing & Vacuum Advance 101

John Z,..beautifully written, especially the advice regarding vacuum advance on the street. I couldn't agree more. There are a half dozen reasons to run it, good reason not to (for street apps).

For clarification, I thought, vacuum advance was 'turned off' at WOT because of higher cylinder pressures and combustion chamber heat, both of which conspire to cause pre-ignition (pinging, knocking, etc).

Your experience and research says it's more to do with AF ratio and the speed with which different AF ratios will burn.

We may be in agreement,..cause and effect.

Can you expound?
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