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Animation of a two-stroke engine. A two-stroke (or two-stroke cycle) engine is a type of internal combustion engine that completes a power cycle with two strokes of the piston (one up and one down movement) in one revolution of the crankshaft in contrast to a four-stroke engine which requires four strokes of the piston in two crankshaft revolutions to complete a power cycle.
The efficiency of the two-stroke engine depends on effective scavenging, the more complete replacement of the old spent charge with a fresh charge. Apart from large diesels with separate superchargers, two-stroke engines are generally piston-ported and use their crankcase beneath the piston for compression. The cylinder has a transfer port ...
In a reed valve engine, the valve is drawn open by suction as the piston moves upward on the compression stroke. As the piston moves down on the power stroke, the pressure in the crankcase causes the reed valve to close. The fuel-air mixture in the crankcase is then forced past the piston via the transfer/bypass ports in the cylinder.
Pages in category "Piston ported engines" ... Crankcase compression two-stroke engine; F. Fairbanks Morse 38 8-1/8 diesel engine; M. Michel engine; N. Napier Deltic; O.
A stroke is the action of a piston travelling the full length of its cylinder.In a two-stroke engine, one of the two strokes combines primarily the intake stroke and the combustion stroke, while the other stroke primarily combines the compression stroke and the exhaust stroke, though technically since both ports are exposed during both the combustion and compression strokes, some reversion ...
The engine has a bore of 8-1/8 inches (206.4 mm), a stroke of 10 inches (254.0 mm) for each piston, and the cylinder height is 38 inches (970 mm). The engine block is of dry block construction. [ 1 ] They have been manufactured with between four and twelve cylinders, depending on application.
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The Rotax 532 is a 48 kW (64 hp) two-stroke, two-cylinder, rotary valve engine, liquid-cooled, gear reduction-drive engine that was formerly manufactured by BRP-Rotax GmbH & Co. KG. It was designed for use on ultralight aircraft .