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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:
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| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| gasoline | instance of | The higher temperature more effectively evaporates fuels | 0.80 | text |
| which increases the efficiency of the compression engine | instance of | The higher temperature more effectively evaporates fuels | 0.80 | text |
| exhaust gas recirculation | instance of | This is necessary for emission controls | 0.80 | text |
| catalytic converters that reduce smog | instance of | This is necessary for emission controls | 0.80 | text |
| other atmospheric pollutants | instance of | This is necessary for emission controls | 0.80 | text |
| Four-stroke engine | related to External links | Engine AnimationsHow Car Engines | 0.60 | section |
| Four-stroke engine | related to External links | WorkAnimated Engines | 0.60 | section |
| Four-stroke engine | related to External links | CDX | 0.60 | section |
| Four-stroke engine | related to External links | New | 0.60 | section |
| Four-stroke engine | related to External links | Four Stroke Internal Combustion | 0.60 | section |
| Four-stroke engine | related to External links | Engine | 0.60 | section |
| Four-stroke engine | see also | Atkinson | 0.60 | section |
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