Performance and exhaust emissions of a two-stroke spark-ignition engine with a direct-injection system
by Yasuhiro Daisho, Takeshi Saito, Noriaki Ishibe, Mitsuhiro Tsukada, Masashi Yukawa
International Journal of Environment and Pollution (IJEP), Vol. 1, No. 1/2, 1991

Abstract: A direct fuel-injection system has been adapted to a small two-stroke spark-ignition engine to prevent the charge from flowing through the cylinder during the scavenging process. The injection system consists of a jerk-type pump and a single-hole nozzle which supplies gasoline to the cylinder. Engine tests were carried out for comparison with the carburettor version of the same engine. The results show that the direct-injection version can achieve greatly improved thermal efficiency and lower HC and CO emissions without intake throttling. In addition, NO_x can be reduced to a much lower level than that of the ordinary four-stroke engine. Heat release analysis and high-speed photography indicate that stratified charge combustion takes place in the direct-injection engine.

Online publication date: Fri, 18-Sep-2009

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