Quote:
Originally Posted by Barnsnake
I'd guess detonation (knocking/pinging). It's the functional equivalent of hitting the piston crown with a hammer. I've seen it break top ring lands and knock piston skirts off.
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Exactly correct.
You can't hear normal combustion because it's a controlled explosion with "burn rate".
If you can hear detonation, imagine how hard it is hitting the piston, and the valve heads, combustion chamber, cylinder walls, wrist pins, rods, and bottom end bearings.
