----- Original Message -----
Sent: Sunday, June 01, 2008 5:36 PM
Subject: [LML] Sparking plugs
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.