Total timing?

[PKRWUD]

Originally posted by red82gt
I thought that at WOT there was virtually no vacuum at the spark port? When I crack the throttle open from idle with the vacuum guage hooked to it it stays at 0, if I hold the engine at say, 2000 rpm, it settles to about 20" and back at zero at idle. Also everything I've read says the same thing, I think you've just mixed yourself up today PKRWUD, everthing else you've said makes sense to me except this.

Vacuum advance operates on PORTED vacuum, not MANIFOLD vacuum. You seem to have them backwards.

Check your ports yourself. Oh wait, you mention that in your last post. So you understand you were mistaken, and how important it is to calculate in your vacuum advance. Good.

You had me worried for a minute there.