Quench Explanation

I`ve always heard of the word "squish" used in place of what is now referred to as quench. Squish was created when the flat area of the piston and the corresponding flat part of the combustion chamber, closest to the piston, squished the fuel/air mixture into the expanse of a wedge shaped combustion chamber. Like moper said, things like hemispherical combustion chambers and pistons with domes or reliefs will make another set of variables.