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Magneto question


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My 1923 magneto is currently being rebuilt.

About 20 years ago I read or heard about advancing the internal gear a few teeth for better engine performance. I did this mod and it did make a good difference and has been working well since then.

I sent the magneto off to the rebuilder with a note attached to keep the same internal advanced setup. He won't do it and didn't take note of how many teeth it was advanced and I can't remember how many.

Has anyone heard of this mod and have any details on it?

The advancing didn't have any ill effects on the magneto by the way. It failed because of a seized bearing.

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The only thing the internal gearing does is time the distributor rotor to the spark plug leads.

The only possible effect you could have had from what you did is to have offset that arrangement somewhat causing the same effect as a very wide spark plug gap.

Good for performance but murder on the mag coil......... :eek:

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