Interesting plug idea, no ignition needed?
http://www.smartplugs.com/leanburn/index.html
RODNEY BINGHAM
Its not a spark plug. Its a glow plug. No control over
when it fires. A low compression AC piston engine will tolerate
this but you must mix nitrometane and maybe methanol in the fuel.
Glow plugs are widely used in diesels to improve the starting.
Have you every had a model airplane engine?
http://en.wikipedia.org/wiki/Model_engine
"Glow plugs are used for starting as well as continuing the power
cycle. The glow plug consists of a durable, mostly platinum , helically
wound wire filament , within a cylindrical pocket in the plug body,
exposed to the combustion chamber . A small direct current voltage
(around 1.5 volts) is applied to the glow plug, the engine is then
started, and the voltage is removed. The burning of the fuel/air
mixture in a glow-plug model engine, which requires methanol for the
glow plug to work in the first place, and sometimes with the use of
nitromethane for greater power output and steadier idle, occurs due to
the catalytic reaction of the methanol vapor to the presence of the
platinum in the filament, thus causing the ignition. This keeps the
plug's filament glowing hot, and allows it to ignite the next charge.
Since the ignition timing is not controlled electrically, as in a spark
ignition engine or by fuel injection , as in an ordinary diesel , it
must be adjusted by the richness of the mixture, the ratio of
nitromethane to methanol, the compression ratio , the cooling of the
cylinder head , the type of glow plug, etc. A richer mixture will tend
to cool the filament and so retard ignition, slowing the engine, and a
rich mixture also eases starting. After starting the engine can easily
be leaned (by adjusting a needle valve in the spray bar) to obtain
maximum power. Glow plug engines are also known as nitro engines. Nitro
engines require a 1.5 volt igniter to light the glow plug in the heat
sink . Once primed, pulling the starter with the igniter in will start
the engine."
I guess you could turn it on just before you need ignition.
This scheme might work for the trailing plug in a rotary.
Paul Lamar
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