Two stroke IC engine - has variable valve timing which is adjusted to suit engine load

摘要

A two-stroke internal combustion engine with at least one inlet and one exhaust valve for each combustion chamber has the valve timing arranged so that the opening periods of the two valves overlap. The lining of the openings of the valves with respect to the angular position of the crankshaft can be varied to suit the engine load. As a result of these changes in valve timing the effective compression stroke Vv of the engine at full load is reduced to a value Vt at part load. At the same time the effective working stroke Av at full load is increased to a value At at part load. USE/ADVANTAGE - The valve adjustment provides more effective scavenging of the combustion chamber.