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All of those people using automotive spark plugs in
their high performance aircraft engine, please make yourself known and - -
- tell the rest of us what the temperature is of ceramic insulator
of your automotive spark plugs when the engine is operating under high power hot day certification conditions?
Please! Step forward and give us the hard
numbers?
********* long pause for reality check
***********
I can tell you the answer to that question with respect
to an aviation spark plug.
But unless somebody has measured it - - you really
don't have any idea - - - do
you?
And keep in mind that 25 to 50 degrees "too hot" can
make all the difference between "OK" and pre-ignition disaster as some
have experienced.
That fact that ANYONE has experienced a pre-ignition
disaster due to an automotive spark plug - - - is a VERY good reason for
everyone else to NOT use those plugs until SOMEBODY has measured the ceramic
temperatures.
Regards, George Braly
PS. It is REALLY hard to get a valid signal
from a thermocouple in a spark plug inside a cylinder and to get a valid
reading when the thermocouple is sitting about 1/8th inch away from an electrode
that is discharging 25KV about 22 times each second. Really. It can
be done. But it is not for the faint of
heart.
1.
Consistent large gap.
2.
Small electrodes that don't block the flame.
3.
Great spark exposure to F/A mix (see 2).
4.
Electrodes don't wear.
5.
Great endurance.
6.
Can you go wrong with a well designed moped plug? Nah!
7.
Cheap - merely US$ 11 per plug (I use Denso IK27 with my Light Speed
Eng.
EI).
SOLD!
Thanks Grayhawk
Cheers
Dom
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