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From what I understand, the ceramic coating only stays about 100°C above normal during the combustion stroke. When the new charge enters the combustion chamber it cools the ceramic surface cooler than what it would be if it were metal. As the flame grows, when it contacts the ceramic surface it heats back up again to a temperature much hotter than the metal piston or head or valve. Since the flame that reaches the surface is already burnt, there's no chance of detonation. In reality the ceramic coating should reduce detonation by creating a cooler surface where the not-yet-burnt charge is still sitting.
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