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Username Post: Vacuum Advance- how is it supposed to work?
Honored Member
Posts 27381
04-06-10 09:44 AM - Post#1893807    

"yeah, switching to full manifold vacuum probably doesn't do much for a stock engine, it's definitely more for performance applications."

Trust me, they ALL like full manifold vacuum.

The only reason the ported vacuum was used, along with very little initial timing, was smog engines of the 70s and early 80s needed a lot of heat in the exhaust to make the early catalytic converters work. It wasn't for performance, economy, or driveability, because it hurt all three.

Now that cats have advanced a bit, the carmakers run a "normal" amount of vacuum advance, it's just programmed into the engine computer instead of being analog.

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