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From: "Gary Casey" <glcasey@adelphia.net>
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Subject: Re: [LML] Re: Electrical ignition
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<<Lets put our money where our mouths are. Is there anyone out there with
an electronic ignition and a straight 160 horsepower engine that thinks
they can beat me? If so, see you at Sun 'N Fun if not sooner.>>

and:

<<You can time your mags for as high a performance level as you dare.  I'll
quote Walter A. that "where the spark comes from doesn't matter, it's when
the spark occurs (TDC) that does.">>

and:

<<One of the great advantages of the newer electronic units is a control
that
varies the spark over the power range.  I see reduced cyl temps and at least
half a GPM in fuel savings in cruise.  Operation is so smooth that running
lean of peak is easy even with Lyc. injectors.>>

Here's my question:  With these engines the numbers should be very
consistent.  What compression ratio to assume - not sure, but pick one.
Given a manifold absolute pressure of, say, 20 inches, a fixed rpm of 2400
to 2500 and a fixed mixture of maybe 30 LOP, what is the optimum (MBT)
ignition timing with both ignitions at the same timing setting?  What is the
optimum timing for the second ignition if one ignition is set at 20 BTC?
What is the BSFC in each of the three conditions?  I'm sure there is someone
out there that has accurate data - and you know who you are!

Gary Casey
IO-540, 2 mags, but one might get exchanged for something else.