Thanks for the excellent, detailed description. The comments certainly
haven't fallen on deaf ears. It's responsible and refreshing when
contributors take the time and trouble to research what they say in
order to provide a clear and concise explanation.
Alan
-----Original Message-----
From: forum-owner@europaclub.org.uk
Schoonhoven
Subject: Re: Mo Gas o No Mo Gas
Comments about dual plugs in aircraft engines posted here are wrong.
Aircraft engines have dual plugs to provide a complete redundant
ignition
system, not because one is always fouling.
There are two magnetos, ignition leads, spark plugs on every cylinder.
The
engine runs better on both at idle than on either one because the
cylinders are typically so big, and the idle speed so low, compared to
rotax at least, that combustion is more efficient with two sources of
ignition.
The plugs should not foul in a typical installation in at least 100
hours
of operation when using 100LL in low compression engines designed for 80
octane. It helps if the pilot leans the mixture for ground running, but
few
do, and that sometimes causes the problem.
I hope this forum can continue to provide true, clear information, not
just
opinions and daydreams.
Thank you,
Peter
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