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A 500 cc single cylinder two-stroke engine employing cross scavenging and direct air-assisted gasoline injection is described. Preliminary engine test results are presented for 3000 rpm full load and 1600 rpm part load operating conditions. The effects of fuel injection timing on full and part load brake specific fuel consumption and exhaust emissions are examined.

This paper describes the operation and performance of two direct fuel injection strategies, namely a ram-tuned injection system (single fluid) and an air-assisted injection system (twin fluid). The injection systems are tested on a 500 cm3 single-cylinder cross scavenged two-stroke cycle engine during part load operation at 1600 rev/min. Particle sizing tests are presented for each injection system, in conjunction with specific emissions and performance results for firing engine tests.