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It does speed up the combustion process, because instead of squirting all the fuel into the piston dish like a DI engine, ours squirt the fuel into the prechamber. The stream hits the pintle ball and swirls, combustion first starts and begins to push air and fuel out through the prechamber holes, and the now mixed air fuel charge continues to burn better and quicker inside the main combustion chamber. The prechamber tip looks like a rocket engine under load, shooting the burning air fuel charge into the combustion chamber.
Prechamber diesels do have the ability to rev much higher than DI diesels. Horsepower is the way we rate owed output of engines (or KW). Since power is work over time, an engine that spins faster will have a bigger horsepower number. 200 lb/ft of torque at 4000rpm is more powerful than 200 lb/ft at 2000rpm.
So the quoted section from Wikipedia is correct.
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