Uncontrolled detonation or pre-ignition is a problem in ICE not because it creates less force, but rather because it creates more force and at the wrong time. I

Uncontrolled detonation or pre-ignition is a problem in ICE not because it creates less force, but rather because it creates more force and at the wrong time. If engines could be made strong enough to remain reliable while operating on detonation, and the pulses timed right, I imagine you would get more energy out of a given volume of fuel. This whole problem is avoided in a rocket combustion chamber without all the rotating parts