Abstract
This paper presents the results of experiments conducted with a 2-cycle engine that was the world's first such engine to comply with the 2000 California emissions regulations for small off-road engine adopted by the U.S. state of California in 2000. This engine is fitted with two scavenging passage that runs around the crankcase and space of between piston and inside of 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 width of the scavenging passage would affect the state of combustion and exhaust gas composition.
