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RCUniverse Glossary

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4 Stroke
“4 Stroke” is short for “four-stroke cycle,” which refers to a type of engine used on model airplanes, automobiles and other machines. The four strokes are two downward and two upward motions of the piston(s) inside the cylinder(s). The first (downward) stroke is called “intake,” which reduces pressure in the cylinder. With the intake valve open, this draws fuel/air mixture into the cylinder from the carburetor. The second (upward) stroke is called “compression,” and with both valves closed the fuel/air mixture is compressed until it is ignited by a glow plug or spark plug. The third (downward) stroke is called “power,” where the pressure from the burning fuel drives the piston downward. The fourth (upward) stroke is called “exhaust,” and with the exhaust valve open the piston forces the spent fuel out the exhaust pipe. Note that four-stroke engines “fire” every-other time the piston reaches the top. (See 2 Stroke)

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See also: 2 stroke Added by: Ralph Morris
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