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From: "Gary Casey" <glcasey@gte.net>
To: <lancair.list@olsusa.com>
Subject: LASAR and other "hot" sparks
Date: Tue, 15 Jan 2002 06:15:57 -0800
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          <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>>
          <<  Lancair Builders' Mail List  >>
          <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> 
>>
<<This is a consequence of the
electronically managed hot-spark advance more completely burning the fuel in
the cylinder rather than the exhaust pipe, thus resulting in more power.>>

I think you'll find that the difference between LASAR (including other "hot"
spark systems) has much more to do with spark timing than it does with the
energy in the spark.  There can be a slight difference in initial burn rate
because of the total spark energy, but at normal (not extremely lean)
mixtures the difference is not significant.  Even if there is a difference,
it manifests itself in less lag from the spark to peak pressure, not in any
"more complete combustion."  I would guess, based on experience that a
"hotter" spark might reduce the advance requirement by 1 degree.  With two
plugs there won't be much difference.  After the fire is lit it will go to
completion regardless of how hot the spark was.  When I look at the results
(lower EGT's, higher CHT's) it looks exactly like running the engine with
more advance and that's what I suspect they are doing.  No magic.

Gary Casey
ES project


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