抄録
The performance of an internal combustion engine is fairly well improved by the effects of the inlet and exhaust systems. The flow areas of those systems of the usual engine are not always suitable to make full use of the effects of the inlet and exhaust systems. The present authors have experimentally investigated the inlet system of a crankcase-scavenged two-cycle engine, which brings a most remarkable improvement to the delivery ratio. It has been confirmed that the delivery ratio increased by the effect of the induction pipe reaches maximum in the period of inlet port opening, which is longer than the usual period. Further they have examined the flow resistance of the carburetter and the air cleaner by replacing them with a throttle, and found out that the effect of the induction pipe is entirely vanished at the area-ratio of the throttle to the induction pipe under 0.3∼0.4.
