Basic engine nomenclature
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==The "strokes" of an internal combustion 4-stroke engine== | ==The "strokes" of an internal combustion 4-stroke engine== | ||
From [http://www.answers.com/topic/internal-combustion-engine#Nomenclature Engine nomenclature]: | From [http://www.answers.com/topic/internal-combustion-engine#Nomenclature Engine nomenclature]: | ||
| − | 1. Intake stroke: The first stroke of the internal combustion engine is also known as the suction stroke because the piston moves to the maximum volume position (downward direction in the cylinder). | + | 1. Intake stroke: The first stroke of the internal combustion engine is also known as the suction stroke because the piston moves to the maximum volume position (downward direction in the cylinder) which pulls the fuel/air mixture into the cylinder. During this stroke the inlet valve is open, and the vaporized fuel mixture enters the combustion chamber. The inlet valve closes at the end of this stroke. |
2. Compression stroke: In this stroke, both valves are closed and the piston starts its movement to the minimum volume position (upward direction in the cylinder) and compresses the fuel mixture. During the compression process, pressure, temperature and the density of the fuel mixture increases. | 2. Compression stroke: In this stroke, both valves are closed and the piston starts its movement to the minimum volume position (upward direction in the cylinder) and compresses the fuel mixture. During the compression process, pressure, temperature and the density of the fuel mixture increases. | ||
| − | 3. Power stroke: When the piston reaches the minimum volume position, the spark plug ignites the fuel mixture and burns. The | + | 3. Power stroke: When the piston reaches the minimum volume position, the spark plug ignites the fuel mixture and burns pushing the piston down. The power is transmitted to the crank shaft mechanism. |
| − | 4. Exhaust stroke: | + | 4. Exhaust stroke: After the power stroke, the exhaust valve opens. During this stroke, the piston starts its movement at the bottom position. As the piston rises the spent exhaust gasses exit through the outlet valve. At the end of this stroke, the exhaust valve closes, the inlet valve opens, and the sequence repeats in the next cycle. Four-stroke engines require two revolutions. |
==Other terms== | ==Other terms== | ||
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