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I have been told running one electronic ignition and one magneto has a
problem .  The aftermarket electronic ignition, on a non turbo installation,
has more timing advance to optimize both power and economy by lighting the
mixture earlier as altitude is increased.  The problem is, the later timed
mag tries to fire as the pressure is rising from the earlier firing of the
electronic ignition.  This pressure rise will prevent the plug from firing
and cause the coil in the mag to short.  (Most of us have seen the old spark
plug testers that would fail the wide gapped or dirty plug as the pressure
was increased)  The coil on the mag dies about 300 hours after the
electronic ignition is installed.  I have heard this from several people who
experienced it.

I also understand there is a significant improvement in dual electronic
ignitions since the combustion chambers of our dual plug aircraft engines
were designed to have both plugs fire at the same time.

Since I plan an all electric airplane (no vacuum system), a dual
buss/alternator/battery will be my redundancy.  I am interested in the Prism
Electronic Ignition, maybe George Braly will give us some details.  Is the
advance curve tailored to the leaning procedure for GAMI injectors?

Steve Colwell   Legacy 2K  Placerville,CA   (530) 621-3408

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