Posted by Bob M on October 28, 2008 at 11:49:22 from (151.190.254.108):
In Reply to: Re: Dist interchange posted by Farmall A on October 28, 2008 at 10:21:54:
The magneto has no centrifugal advance - only a fixed ignition retard built into the impulse coupling. (It retards timing only at cranking speeds.) Therefore there are no centrifugal advance parts in a mag that can be transplanted into a distributor.
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As JimN and NDS point an A distributor will work fine on an M. It might cause the M to develop just a tad less power - probably not enough less to notice however. It also MIGHT cause an increased tendency to backfire on a sudden throttle closure. But then so does the "correct" distributor as the advance parts wear - so it's really not a big deal.
If it were mine go ahead and use it...
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A word of caution on your high voltage coil: The 40KV coil will indeed fire .040 plug gap. HOWEVER the distributor is designed for lower voltage (20KV or less). So long as the cap and rotor are in good shape and clean it'll work fine. But the HV coil and the wide plug gap may result in arcing inside the cap (and consequential misfiring) as the cap ages, accumulates internal dust and moisture, etc. Bottom line is you may be better off using a conventional coil and standard plug gap with your electronic ignition.
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