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| - A Four-stroke cycle engine, is one of two main types of engines. The other type being the two-stroke cycle. Besides motorcycles, four-stroke cycle engines are commonly used in cars, trucks, and many other things mainly because they can be muffled without slowing the engine down as much. The name four-stroke refers to it taking four piston strokes in a four-stroke engine to complete the four main engine processes(intake, compression, power, exhaust). The four-stroke is known for making a loud revving noise in the engine. For years, four-strokes were nearly absent in AMA motocross and Supercross events. Recently, however, the AMA has allowed for larger engine sizes when four-strokes are used(250cc instead of 125cc and 450cc instead of 250cc), this is most likely because four-strokes are more
- The four-stroke cycle (or Otto cycle) of an internal combustion engine is the cycle most commonly used for automotive and industrial purposes today (cars and trucks, generators, etc). It was conceptualized by the French engineer, Alphonse Beau de Rochas in 1862, and independently, by the German engineer Nikolaus Otto <a href="http://en.wikipedia.org/wiki/Nikolaus_Otto">http://en.wikipedia.org/wiki/Nikolaus_Otto</a> in 1876. The four-stroke cycle is more fuel-efficient and clean burning than the two-stroke cycle, but requires considerably more moving parts and manufacturing expertise. Moreover, it is more easily manufactured in multi-cylinder configurations than the two-stroke, making it especially useful in high-output applications such as cars. The later-invented Wankel engine has four similar phases but is a rotary combustion engine rather tha
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| abstract
| - A Four-stroke cycle engine, is one of two main types of engines. The other type being the two-stroke cycle. Besides motorcycles, four-stroke cycle engines are commonly used in cars, trucks, and many other things mainly because they can be muffled without slowing the engine down as much. The name four-stroke refers to it taking four piston strokes in a four-stroke engine to complete the four main engine processes(intake, compression, power, exhaust). The four-stroke is known for making a loud revving noise in the engine. For years, four-strokes were nearly absent in AMA motocross and Supercross events. Recently, however, the AMA has allowed for larger engine sizes when four-strokes are used(250cc instead of 125cc and 450cc instead of 250cc), this is most likely because four-strokes are more enviromentally friendly. Image:Motorcycle 2.png This article is a stub. You can help Motorcycle Wiki by expanding it.
- The four-stroke cycle (or Otto cycle) of an internal combustion engine is the cycle most commonly used for automotive and industrial purposes today (cars and trucks, generators, etc). It was conceptualized by the French engineer, Alphonse Beau de Rochas in 1862, and independently, by the German engineer Nikolaus Otto <a href="http://en.wikipedia.org/wiki/Nikolaus_Otto">http://en.wikipedia.org/wiki/Nikolaus_Otto</a> in 1876. The four-stroke cycle is more fuel-efficient and clean burning than the two-stroke cycle, but requires considerably more moving parts and manufacturing expertise. Moreover, it is more easily manufactured in multi-cylinder configurations than the two-stroke, making it especially useful in high-output applications such as cars. The later-invented Wankel engine has four similar phases but is a rotary combustion engine rather than the much more usual, reciprocating engine of the four-stroke cycle. Image:4-Stroke-Engine.gif The Otto cycle is characterized by four strokes, or straight movements alternately, back and forth, of a piston inside a cylinder: 1.
* intake (induction) stroke 2.
* compression stroke 3.
* power (combustion) stroke 4.
* exhaust stroke The cycle begins at top dead center, when the piston is at its uppermost point. On the first downward stroke (intake) of the piston, a mixture of fuel and air is drawn into the cylinder through the intake (inlet) port. The intake (inlet) valve (or valves) then close(s), and the following upward stroke (compression) compresses the fuel-air mixture. The air-fuel mixture is then ignited, usually by a spark plug for a gasoline or Otto cycle engine, or by the heat and pressure of compression for a Diesel cycle of compression ignition engine, at approximately the top of the compression stroke. The resulting expansion of burning gases then forces the piston downward for the third stroke (power), and the fourth and final upward stroke (exhaust) evacuates the spent exhaust gases from the cylinder past the then-open exhaust valve or valves, through the exhaust port.
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