Originally Posted by ChrisAttebery

Actually, it's not the tight squish that causes the detonation it's the raised C/R. If you could lower the squish and open up the chamber the motor would actually run cooler. This is what the high end tuners of the late 90s were doing to boat and ducted fan motors.

We were running really tight squish bands (.003"-.008") on up to 65% nitro. You just have to open the bowl of the head to compensate.

This all applies to hemi head motors. I haven't looked at a RC car motor in a long time.