Quote:
Originally Posted by olddog
I have been trying to find out if the mechanical is straight line lenear or a curve. If a curve what does it look like.
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That hand drawn graph of mine is an estimation of the advance with those particular springs that I'm using as detailed in the MSD literature. If I were to do it really accurately I would just use my timing light and check the advance values at 100 RPM increments. That would be pretty easy. Vacuum advance would be more difficult. The graph might surprise you; I don't know. The "spin" could come on very quickly, almost in spurts, and give you a subtle stair-step graph, or it could be smoother and straighter. You won't know until you graph it (or put your distributor on a dizzy machine).