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Colyn,
Other than curiosity - - it is not,
frankly, important that I know what the number is supposed to be - -
What is important is that nobody has a clue
as to what the number is for the automotive spark plug mounted in the
aircraft application.
Keep
in mind that the automotive spark plug enjoyes being "heat sunk" into a
massive water cooled cylinder head that is held at constant temperature from a
thermostat.
By
contrast, the aircraft spark plug is desgined for the much more variable
environment of the air cooled cylinder head which can have temperatures more
than twice as high as the automotive cylinder head.
There
is a casual acceptance of a substantial level of
"under-investigation" that is associated with some of these often
routinely accepted recommendations to use components that have not
undergone thoughtful testing at the boundary conditions of
realistic operating environments.
Regards, George
PS> The answer to your question is in some of
the APS class materials. We made a power point slide that detailed the
aircraft spark plug ceramic temperature as a function of A/F
ratio.
George said
I can tell you the answer to that question with respect
to an aviation spark plug.
okay, what's the answer? say, 50 dF LOP 32" TSIO-550
....or whatever you actually have.
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