Development of a Two-cylinder Two-stroke Gasoline Direct-Injected Engine

ABSTRACT Recently, emission regulations formerly concentrated on the acknowledged major polluters, such as motor vehicle engine, have been extended to the smaller engines. This forced the two-stroke engines manufacturers to search for environmentally cleaner solutions. In this respect the most promising technology seems to be the adoption of directinjection and the challenge is not to complicate excessively a power system which has in simplicity and low cost its best advantages. The paper reports on a two-stroke gasoline direct-injection engine prototype which even if equipped with a low-pressure fuel pump, provides high injection pressure values thanks to a Water-Hammer effect. The engine is a two-cylinders-water-cooled type and its design follows previous experiences on single-cylinder engines prototype. Once described the basic working principles of the proposed concept the engine realization phases and its running results on a test bed are presented. Paper presented at the SETC 2004 `Small Engine Technology Conference and Exhibition, Graz - Austria, 2004.