"Drew Dalgleish" wrote in message
...
Just read the kitplanes article on electronic ignitions. Is anyone
here flying with an e-mag p-mag combo that would like to share their
experience. Does it really make more power and any service or
instalation problems. Thanks Drew

Well, I probably shouldn't be the one to try an answer, since my experience
is limited to a quick look at the EMagAir web site a few minutes ago. But
since no one else has come forward, I'll try from a purely theoretical
perspective and a little knowledge of cars long ago...

At full power, there should be no change; because the timing should be the
same as on your old magnetos. And my presumption is that the purpose is a
system upgrade, rather than to repair a deficiency in the current ignition.

Assuming that you connect the MAP sensing, there will be a spark advance as
you reduce manifold pressure and, therefore, the engine should produce
slightly more torque for a given combination of RPM and reduced manifold
pressure.

Therefore, with a constant speed prop--where you manually adjust RPM and
manifold pressure according to a table and then lean by EGT--you should
receive a slightly faster cruise and possibly slightly lower fuel
consumption.

In the case of a fixed pitch propeller--where manifold pressure is rarely
even monitored and cruise power is set entirely by RPM--the improvement
should be entirely the result of reduced fuel consumption. In some
installations, you may be able to achieve a higher RPM at some altitudes
without exceeding the maximum--yielding a result similar to that expected
for a CS prop.

I have no opinion as to whether any resulting higher power output is harder
on the engine, about the same, or even slightly easier...

I hope this helps.

Peter