Re: Magneto -v- coil and distributor

Posted by John T on June 24, 2007 at 07:35:35 from (66.244.83.147):

In Reply to: Magneto -v- coil and distributor posted by Thomas D Windsor on June 23, 2007 at 22:22:35:

If I had a battery powered coil distributor ignition I wouldnt replace it with a magneto.

1) The slower a mag turns the less its spark energy while the coil ignition still produces relatively high energy at idle (or hard lugged down RPM) as well as high RPM i.e. its NOT RPM dependant for its energy, it gets it from the storage battery. At low hard lugging RPM when you need a good strong spark the most is when the mags spark energy (notwithstanding the impulse starting spark) is low, but the coil still has high spark energy when the engine is lugged down.

2) The Mag HAS ONLY TWO TIMINGS its start/impulse and its advance/run timing while the distributor has a variable advance curve that is based on engine RPM i.e. it advances the timing as RPM increases gradually.

3) The Coil ignition can be a bit more forgiving of off timign or imperfect points versus the mag which has to be pretty well right for good starting and performance.

4) Of course, the Mag has the advantage of not needing any battery power so it can still start a tractor with a weak battery or even a hand cranker.

John T

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