A non-fueled prechamber ignition system was developed to provide for controlled and stable combustion to best support the goals of both Waukesha Engine and the ARES program. This paper will provide details and results of efforts undertaken in optimization of the following design aspects: tangential angle of prechamber orifice channels in relation to head-induced cylinder swirl, prechamber orifice diameter, prechamber volume (spark plug recess in precombustion chamber), and recession of the entire precombustion chamber into the cylinder head. A number of important conclusions will be verified and presented based on the development work done on a laboratory engine.

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