Quote:
Originally Posted by Dashman
Also check the vacuum advance unit that it is moving freely, or moving at all, and it goes to timed port vacuum, not manifold. Manifold vacuum would be advancing it when the RPM is decreasing, no bueno.
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You want manifold vacuum, not timed for VA. Otherwise you have no VA at idle or when pedal is released. with base timing 8-12 degrees, VA at idle using manifold vacuum adding 10-14 degrees gives you 20-24 degrees of advance at idle and low part throttle (read most cruising time) which is ideal.
Timed vacuum was a failed emission reduction trainwreck.
Controlling how much and when VA comes in is a secondary conversation but also very important to solid tuning. Adjustable VA can and a detent plate installed to limit how much VA can be added is all part of it. Be it home made detent or the Crane one no longer available is the way to go relative to setting up VA along with an adjustable VA can..