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In a two-stroke cycle engine, it is impossible to except the effect of engine brake, owing to its structure. However, since the necessity of engine brake has increased with increasing the vehicle speed, and with increasing the complexity of traffic problems, it is demanded to solved. For this reason, the authors investigated the mean frictional loss pressure of engine, and the effect of releasers on the engine brake with a crankcase-compression two-stroke cycle engine. The results, one of the weak points on a two-stroke cycle engine be solved completely by the application of releaser.

In a gasoline engine, it is most important to recognize the behavior of fuel liquid-film flow in the intake pipe. Accordingly, the authors have tried to measure directly the amount of fuel liquid-film flow by means of the each separator inserted in the intake manifold and at the same tine to record the instantaneous behavior of liquid-film thickness from the change in electric conductivity. Especially, the experimental results on the measuring method of fuel liquid-film thickness will be described in this paper.

Taking note of the value of the maximum delivery ratio Km produced by the inertia effect, the authors qualitatively considered the influences of the atmospheric conditions and the engine factors to compare them with the experimental. It is ascertained that the value od maximum delivery ratio depends on the inertia effect and the theoretical results correspond fairly well with those of the experimental value.