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Randy: I think what you mean is pre-ignition, not
detonation, to take out cylinders. Severe detonation may cause peening of the
top of the piston, broken ring lands, or cause hot spots which could result in
pre-ignition, but it is usually the incredible temperatures and pressures
associated with pre-ignition that will "hole" pistons. (See Contact! magazine
issue 57 for a comprehensive treatment of detonation and pre-ignition). From
your description I would hazard a guess that what you saw resulted from
incorrect timing and mixture. My O-235 is 9.7:1, and I have dual LSE Plasma Is;
My $1.67 Denso plugs run so clean, with no electrode wear! And my coils are
on top of my engine!
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