Engine Modification at the Gasoline Engine（Part 1） : Effect of the Orifice in the Manifold

摘要

A study of the exhaust emission control of a gasoline engine is continued at our laboratory.　　In this report, it is aimed to increase the atomization　effect by separating the liquid fuel which influences to combustion within the cylinder from the inside wall of manifold with three kind of orifices inserted into the inlet manifold.　　As a result, the inserted position of orifice is more important than the diameter on the hydrocarbon content of exhaust gas, fuel economy and deviation of combustion peak pressure, and the orifice position is optimum at the middle of the inlet manifold in this engine.