[AMC-List] Plugs

[JOE FULTON <piper_pa20@xxxxxxxxxxx>]

FYI multi-electrode plugs (usually four electrodes)
are commonly used in light aircraft Lycoming and
Continental engines.  In those engines it may have
something to do with the propensity for lead fouling. 
Lead is still used in avgas and when one of the
electrode gaps gets impaired by lead salts, one or
more of the others can continue to develop spark.  Yes
I know only one spark can be generated at any give
firing impulse.

Also, light aircraft engines typically have dual
ignition systems for reliability (like the old Nashes)
but the dual spark event definitely develops more
power from the engine.  

Perhaps the next thing we'll see in cars, is a return
to dual ignition along with multiple intake and
exhaust valves we're seeing now.

Fine wire plugs are also used as an option in
aviation.  These are generally platinum coated.

Joe Fulton
Salinas, CA
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