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The Two-Stroke Engine
individu
The two-stroke engine is similar to that of the four-stroke-cycle engine in its reciprocating mechanism. It uses the piston-crankshaft mechanism, but requires
only one revolution of the crankshaft for a complete power-producing cycle.
The two-stroke engine does not use inlet and exhaust valves. The gas exchange
is implemented by scavenging and exhaust porthole openings in the bore wall. The upward and downward motion of the piston simultaneously opens and closes these portholes. The air-fuel mixture then goes in or out of the combustion chamber through the portholes. Combustion takes place at every rotation of the crankshaft.
In the two-stroke engine, the space in the crankcase works as a precompression chamber for each successive fuel charge. The fuel and lubricating oil are premixed and introduced into the crankcase, so that the crankcase
cannot be used for storing the lubricating oil. When combustion occurs in the cylinder, the combustion pressure compresses the new gas in the crankcase for the next combustion. The burnt gas then exhausts while drawing in new gas. The lubricating oil mixed into the air-fuel mixture also burns.
http://www.automotivemachine.blogspot.com/2011/08/two-stroke-engine.html
Article submitted Thursday, January 26, 2012 & read 186 times.
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