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Lately I have been doing research regarding advancements in the understanding auto-ignition and detonation. I have located great information and have learned plenty about formation of hot spots, pre-flame reactions, radicals and transition from deflagration to detonation. I have one question...

What causes some areas of the combustion chamber to coat with carbon while other areas remain clean?

Without turbulence in the combustion chamber we would burn the mixture at the laminar burning rate which is ten to twenty times slower than the turbulent rate. Numerous designs beyond common squish areas have been developed to shorten burn times. Does anyone have experience with turbulence...