Hi John,

Detonation refers to more energy being imparted to the fuel air
mixture by
compression heating than can be absorbed without igniting the fuel.
Detonation damages rod bearings and is a serious problem over the
long
term
in reciprocating engines.

John, every power stroke of a diesel engine fits that definition.
Diesels, by definition, compress the fuel & air to the point the
fuel ignites.

only air is compressed, but well beyond the point where fuel will
ignite! But the fuel is only added at the moment when it is supposed to
ignite.

regards,
Friedrich

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