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Matt Prather wrote:

Maybe the lean mixture limit is being driven by inadequate/not
optimised
spark.  More spark energy, bigger gap, multiple discharge, better fuel
atomization are things that could be looked at.  0.455 isn't bad,
however.

Regards,

Matt-

Maybe.  We'll try, we ave a system which can adjust spark energy.
Thanks for the suggestion.
Francois

Del Johnson wrote:

The Cafe Foundation's research on Ignition Dynamics (
http://www.cafefoundation.org/research.htm ) found that you had to advance
the ignition as you lean the fuel to achieve adiquate fuel burn.  They
stated that as the fuel/air ratio decreases the fuel molecules are further
apart and take longer to ignite.   As the engine (Lycoming) was leaned the
EGT would decrease to a point where ignition was starting to fail at which
time the EGT would increase due to the fuel being partially burned in the
exhaust stack.  By advancing the spark they could delay the point where EGT
rose thus permitting further leaning of the engine..

 
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