Combustion characteristics and performance of natural gas in high speed indirect injection diesel engine

In recent years, efforts have been directed towards environmentally freindly sources of alternative fuels for internal combustion engines. This paper investigates combustion characteristics and performance of natural gas in an unmodified compression ignition engine using diesel fuel pilot injection. The factors influencing knock limits in dual fuel gas engines have been identified. This report is confined to experimental work in a naturally aspirated dual gas engine and the results obtained were compared with the diesel fueled test engine. Cylinder pressure diagrams recorded indicate longer ignition delay and burning rates with an increased pressure variation.