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Username Post: Vacuum Advance- how is it supposed to work?
Valued Contributor
Posts 3361
04-06-10 07:16 PM - Post#1894089    

Howdy, Jim, glad to see you posting.

NOPE, full manifold vacuum advance, more correctly referred to what it really is, a LOAD COMPENSATION DEVICE, should be on full manifold vacuum, IF THE ENGINE DOES NOT HAVE A FUNCTIONING EGR VALVE. If the engine DOES have a functioning EGR valve, ported vacuum sourcing is just fine, as that emissions laden engine is not set up for any kind of performance, nor good stock operation. It's as simple as that.

And, for ANY and ALL vacuum advances, there should be a positive stop on the pull pin, so the load compensator will NOT over time the engine, NO MATTER HOW THE ENGINE IS SET UP, STOCK TO HOT ROD.

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