Effect of Dimensions of Prechamber on Lean Burn Gas Engine

Abstract

The effect of the dimensions of the 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 the A/F in the prechamber at ignition timing. The larger volume ratio of the prechamber results in a higher level of NOx and lower level of SFC. However, the dimensions of the hole result in improvement in the SFC level while maintaining the same level of NOx. Suitable A/ F in the prechamber allows the engine to the 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. © 1992, The Japan Society of Mechanical Engineers. All rights reserved.