Jim,

What damages the engine is excess oxygen and any combustion
temperature.

I would want some kind of proof before buying any part of that
sentence. LOP operation is used with great success.

Any mixture with a temperature drop means that
there is excess fuel.

Nope. Search for "lean of peak" operation.


But
only the pressure wave of detonation will damage the
combustion chamber.

Hmm. I'm not sure the engine experts agree.

--
Thomas Borchert (EDDH)