I've read multiple times that you can get rich detonation. I however cannot find a technical explanation as to WHY this occurs.
I understand why lean mixtures detonate as they are typically hotter. Richer mixtures tend to cool the cylinder bore/piston top due to excess fuel transferring heat out of the cylinder, same concept as water/meth injection.
How does a richer mixture again cause detonation? I understand a rich misfire, but I do not understand rich detonation.
Does anyone have an explanation?
edit: My hypothesis is as follows.
Excess fuel (eg running 12:1) causes a drop in temperature allowing more timing to be run, eg it decreases detonation.
Absurd amounts of fuel (eg running 10:1) whilst it drops the cylinder temp, it increases exhaust backpressure and exhaust temp (due to it burning there) which overwhelms any cooling ability the extra fuel brought along.
Thoughts?