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The internal combustion engine is a machine that develops power from the combustion of fuel within a cylinder. The cycle of operation is as follows: a) Suction Stroke- Just before the piston reaches the inner dead-centre, a valve, usually of the «poppet» type, is opened. On its outward stroke, the piston draws into the cylinder an explosive mixture of air and fuel vapour. Shortly before the piston reaches the outer dead-centre, the inlet valve is closed and the compression stroke begins. Compression stroke- During this stroke, the whole of the gas in the cylinder is compressed into the free space at the head of the cylinder. Explosion, or Working Stroke- When the compression stroke is almost complete, the explosive mixture is ignited by an electric spark or by other suitable means. The ...
This engine differs from the four-stroke engine in having one working stroke during each complete revolution of the crankshaft. During the inward stroke of the piston a port leading to the crankcase is uncovered and the explosive mixture of air and fuel is drawn into the crankcase. On beginning its outward stroke, the inlet port is soon covered, and the mixture is compressed in the crankcase to pressure of about 20 lb. per sq. in. As the outer dead- centre is approached the exhaust port is opened, and shortly afterwards another port opens, which allows the partially compressed charge of gas to enter the cylinder, driving out the exhaust gas before it. A baffle in the piston top directs the unburnt charge to the top of the cylinder, thus preventing undue loss through mixing with the ...
This engine differs from the four-stroke engine in having one working stroke during each complete revolution of the crankshaft. During the inward stroke of the piston a port leading to the crankcase is uncovered and the explosive mixture of air and fuel is drawn into the crankcase. On beginning its outward stroke, the inlet port is soon covered, and the mixture is compressed in the crankcase to pressure of about 20 lb. per sq. in. As the outer dead- centre is approached the exhaust port is opened, and shortly afterwards another port opens, which allows the partially compressed charge of gas to enter the cylinder, driving out the exhaust gas before it. A baffle in the piston top directs the unburnt charge to the top of the cylinder, thus preventing undue loss through mixing with the ...