Abstract
The effect of the dimensions of a prechamber was researched using a medium-sized single-cylinder engine. The air-fuel ratio, A/F, in the prechamber changed quickly, when only gas was supplied to the prechamber. The amount of gas supplied, ignition timing, and A/F in the main chamber were affected by A/F in the prechamber at ignition timing. A larger volume ratio of the prechamber results in a higher level of NOx emission and lower level of heat consumption. However, optimizing the dimensions of the hole results in improvement in the heat consumption level while maintaining the same level of NOx emission. Suitable A/F in the prechamber allows the engine to function, but this is also the source of NOx. The volume of the prechamber must be small and the dimensions of the hole must be optimized.
