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The reason flat pistons don't have as much of a problem is because the CR isn't as high, so the a/f isn't under as much pressure.
The shape of the piston is what increses the CR by reducing the volume in the combustion chamber. SOME high dome pistons (i.e. Endyn) have a treatment to prevent detonation. The Endyn have the sharp corners sanded to be smoother so they don't get as hot.
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