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four stroke engine - traducción al holandés
![Lateral view of a two-stroke Forty series [[British Seagull]] [[outboard engine]], the serial number dates it to 1954/1955](https://commons.wikimedia.org/wiki/Special:FilePath/BritishSeagull2.JPG?width=200 "Lateral view of a two-stroke Forty series [[British Seagull]] [[outboard engine]], the serial number dates it to 1954/1955")
![generator]]](https://commons.wikimedia.org/wiki/Special:FilePath/BronsV8.jpg?width=200 "generator]]")
.jpg?width=200 "Two-stroke motorbike with an expansion chamber exhaust system that increases the cylinder charge")
![1966 [[Saab Sport]]](https://commons.wikimedia.org/wiki/Special:FilePath/Saab 96 Sport.JPG?width=200 "1966 [[Saab Sport]]")
![[[Deflector piston]] with cross-flow scavenging](https://commons.wikimedia.org/wiki/Special:FilePath/Two-stroke deflector piston (Autocar Handbook, 13th ed, 1935).jpg?width=200 "[[Deflector piston]] with cross-flow scavenging")
Definición
Wikipedia
A four-stroke (also four-cycle) engine is an internal combustion (IC) engine in which the piston completes four separate strokes while turning the crankshaft. A stroke refers to the full travel of the piston along the cylinder, in either direction. The four separate strokes are termed:
- Intake: Also known as induction or suction. This stroke of the piston begins at top dead center (T.D.C.) and ends at bottom dead center (B.D.C.). In this stroke the intake valve must be in the open position while the piston pulls an air-fuel mixture into the cylinder by producing a partial vacuum (negative pressure) in the cylinder through its downward motion.
- Compression: This stroke begins at B.D.C, or just at the end of the suction stroke, and ends at T.D.C. In this stroke the piston compresses the air-fuel mixture in preparation for ignition during the power stroke (below). Both the intake and exhaust valves are closed during this stage.
- Combustion: Also known as power or ignition. This is the start of the second revolution of the four stroke cycle. At this point the crankshaft has completed a full 360 degree revolution. While the piston is at T.D.C. (the end of the compression stroke) the compressed air-fuel mixture is ignited by a spark plug (in a gasoline engine) or by heat generated by high compression (diesel engines), forcefully returning the piston to B.D.C. This stroke produces mechanical work from the engine to turn the crankshaft.
- Exhaust: Also known as outlet. During the exhaust stroke, the piston, once again, returns from B.D.C. to T.D.C. while the exhaust valve is open. This action expels the spent air-fuel mixture through the exhaust port.
Four-stroke engines are the most common internal combustion engine design for motorized land transport, being used in automobiles, trucks, diesel trains, light aircraft and motorcycles. The major alternative design is the two-stroke cycle.
The exhaust emissions from four stroke engines, like other combustion engines, contain significant quantities of greenhouse gases, as well as other forms of air pollution. The use of four stroke engines in cars and other transport applications is scheduled to be phased out in some jurisdictions, and as of 2022 other major jurisdictions are considering similar proposals.
