stock distributor
Senior User
Joined: Sep 2009
Posts: 198
Likes: 3
From: Burbank, CA
Way back in my hot rod and race car days, yes. What did you want to do to the advance curve?
The advance curve is changed by working with the springs and the swinging weights. Different strength springs, combined with the weight and the shape of the swinging weights will determine how the advance progresses as the rpms go up. When you're really trying to squeeze power out of an engine, like on a race engine, you work with the advance curve not just with the direct correlation to rpm, but also in relation to the rate at which the engine is accelerating and decelerating.
Most engine shops will have a distributor machine; the most common ones were made by Sun. You mount the distributor in it and spin it up and down while watching the curves on the meters. Then you try a different set of springs and weights and repeat. That's how it's done.
The advance curve is changed by working with the springs and the swinging weights. Different strength springs, combined with the weight and the shape of the swinging weights will determine how the advance progresses as the rpms go up. When you're really trying to squeeze power out of an engine, like on a race engine, you work with the advance curve not just with the direct correlation to rpm, but also in relation to the rate at which the engine is accelerating and decelerating.
Most engine shops will have a distributor machine; the most common ones were made by Sun. You mount the distributor in it and spin it up and down while watching the curves on the meters. Then you try a different set of springs and weights and repeat. That's how it's done.
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