You beat me to the punch John. I have no idea what a positive ground
magneto might be since there are NO WIRES to connect to ground. Of
course the mag uses it's case as ground, but magnetos put out AC. One
of the symptoms of a mag that's weakening is that one set of
cylinders runs better than the other--the ones that have the spark
wire going negative tend to fire easier since the center electrode is
sharper than the side electrode so a spark doesn't need as high a
voltage to fire.
Bill Babcock
billb@bnj.com
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On May 24, 2007, at 7:44 AM, John Herrera wrote:
>> Hey all,
>>
>> In the stash of Spitfire bits that I picked up recently was a Judson
>> electronic magneto (for positive ground car). I'm curious about this
>> thing, but not so curious as to replace my coil with it - and
>> besides,
>> I've got all negative ground cars.
>>
>> What's the story with these? Has any of you ever used one?
>>
>> Scott (B.)
>
> What does the ground polarity of the car's electrical system have
> to do with
> the magneto? The mag produces its own power independant of the car's
> electrical system. And anyway, the current flow from a mag reverses
> as it
> fires each plug in turn. Unless car mags are way different from
> airplane
> mags!
>
> John
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