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It's rather easy to look at what detonation can do, during an engine's autopsy, but what did the damage?.

Well, in reading Obert's *Internal Combustion Engine, and Air Pollution*, he mentions that during detonation, the pressure rise within a cylinder can be in the order of 9,800 PSI PER DEGREE of Crankshaft rotation.

Dunno about you, but, to me, it puts a real *face* on the issue. No wonder it can blow little flakes of AL off the dome of a piston, or destroy the rod bearing's oil film....

 

[Steve Wood]

Makes you wonder about "a few degrees of timing retard won't hurt anything"


I remember when Tom Chou was playing with Buicks, he documented a decrease in rpm acceleration each time detonation was noted....spikes like this certainly explain why.

If, we see about 950 psi of combustion pressure under boost....(I may be remembering this number correctly)...then a spike of 9800 psi would certainly explain spit out cranks, etc.