Quote:
Originally Posted by ft_sjo
The engine would lean misfire if you tried to run 17:1 or leaner at any kind of moderate load. Perhaps you were actually reading a rich misfire. Don't believe all you see (and potentially don't understand) on a gauge.
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I wouldn't doubt the lean, overly rich had been an issue throughout the tuning process. The computer tried to compensate though i believe, late in the game though, after tear down, the most heavily damaged piston, had completely melted down, its spark plug was no longer three pronged, but nubbed, and it was speckled with aluminum.
I believe, based on my amateur analysis, it detonated, damaging the spark plug, which broke down, creating a hotspot, which settled on the piston, and continued to detonate, creating heat, thus melting through the piston.