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so... what was the measured temperature of the plug ceramic
tips with the engine at full power and leaned for best power
?
That is the question. No "appearances" .
Just some hard numbers.
I spoke with Klaus of LSE about this plug thingy, and he
said he did research on this with instrumented plugs 12-15 years ago. The
results were written-up in an article in Sport Aviation about that time. He says
that a plug in the proper heat range will have the insulator covered with a
light tan that varies in shade from slightly darker to slightly lighter; if it
is an even shade then it is running a little too hot. Cracked insulators on a
plug is a sign of detonation. He reminded me that those planes racing at Reno
with LSE ignition and recommended automotive plugs have never had a cylinder go
bad, but several planes with aircraft plugs have. He also said that those
fellows running full-out at 250 mph TAS or more on the race to Oshkosh at
2000' will have 2" MAP boost and will be running at or above 100% power the
whole way! He also claims that none of those racing who have LSE EI
have had a problem with detonation or pre-ignition.
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