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Following the state - of - the - art analysis of typical applications of two-stroke SI engines in road vehicles, new solutions for this type of engine are examined. The two-stroke engine appears as an extremely attractive one during part-throttle opera tions especially from the point of view of fuel consumption, when the problems caused by fresh mixture short-circuiting are overcome. This fact is well confirmed by the renewed interest in the two-stroke cycle SI Engine. A new solution, with direct fuel injection and separate scavenging pump, that shows very low fuel consumption data down to very low B.M.E.P. levels while mantaining a high specific power output and acceptable HC emissions, is then presented.