Vacuum advance information and myths

RB,
Post #56. Using MVA at idle is one way to give the engine the idle timing it WANTS. There are other ways such as locked timing. The problem with locked timing is that the timing.....is locked. Nowhere to go if you get detonation. MVA is load sensitive & can be adjusted to keep out of detonation. That is the beauty of it & why smart people use it. And, no, you don't just plug the VA into a man vac port & walk away. This is where the tuning begins & forget if you are NOT using an adj vac adv unit. Idle timing is set up first, then the centri/dist curve. Not the other way around.