Importance

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Abstract

An exhaust control valve for two-stroke cycle engines used in conjunction with a fuel injection system is disclosed. This valve is within the exhaust passage and, for each revolution of the engine, delays opening of the exhaust passage to the combustion chamber during the expansion stroke of the piston for a preselected number of degrees of rotation of the crankshaft while permitting the necessary opening of the exhaust port to give complete blow down before the scavenging cycle. The valve also permits advanced closing of the exhaust port to eliminate short circuiting of the fresh charge out the exhaust port. A fuel injection system, providing fuel either upstream or downstream from valves in the engine's air intake passage, is provided to operate in timed relation to the piston strokes and the exhaust valve. Also disclosed are means for modifying opening of the exhaust valve at high engine speeds to improve scavenging.

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First Claim