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Old 07-08-2017, 10:41 AM
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av8tor1977
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If indeed the rod big end failure was definitely not lube related, it might have been caused by detonation. Gas has a much lower octane than the methanol in glow fuel, and this along with burning hotter as well may have caused detonation to occur. Look closely for pitting on the old piston crown, and look for signs of heat/overheated oil deposits on the underside of the piston crown. Lowering the compression was a good move, but you might also try pulling a couple of degrees of ignition timing out of the engine.

Then again, it is possible that the prop strike over-stressed the rod....

AV8TOR