抄録
This paper presents the results of experiments conducted with a 2-cyle engine that was the world's first such engine to comply with the emissions regulations applied to small off-road engines by U.S. state of California in 2000. This engine is fitted with a scavenging passage that runs around the crankcase before the scavenging port. The aim of this research was to investigate how changes in the quantity of heat transferred to the fresh air as a result of varying the length of the scavenging passage would affect the state of combustion and exhaust gas composition. Two ion probes were fitted to the combustion chamber in order to detect the state of combustion.
