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RCUniverse Glossary

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2 stroke
“2 Stroke” is short for “two-stroke cycle,” which refers to a type of engine used on model airplanes, leaf blowers and other machines. The two strokes are the downward and upward motions of the piston inside the cylinder. The downward stroke causes pressure in the crankcase, which forces fuel/air mixture up a passage to an opening in the cylinder, where it also assists the spent fuel to exit the exhaust opening. The upward stroke causes the piston to cover the exhaust and bypass openings, and pressure is reduced in the crankcase. This causes a new charge of fuel/air mixture to be drawn in through the carburetor, while pressure is increased in the cylinder until the compressed fuel/air mixture is ignited by the glow plug. Pressure from the burning fuel then drives the piston downward to begin the next cycle. Note that two-stroke engines “fire” each time the piston reaches the top. (See 4 Stroke)

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See also: 4 Stroke Added by: twostroke
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