Four-stroke engine | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-07-04

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Four-stroke_engine


00:01:58 1 History
00:02:06 1.1 Otto cycle
00:05:01 1.2 Atkinson cycle
00:06:14 1.3 Diesel cycle
00:08:00 2 Thermodynamic analysis
00:09:10 3 Fuel considerations
00:11:19 4 Design and engineering principles
00:11:30 4.1 Power output limitations
00:12:59 4.1.1 Intake/exhaust port flow
00:13:41 4.2 Waste Heat Recovery of an internal combustion engine
00:14:49 4.2.1 Supercharging
00:15:46 4.2.2 Turbocharging
00:17:31 4.3 Rod and piston-to-stroke ratio
00:18:16 4.4 Valve train
00:19:18 4.4.1 Valve clearance
00:20:08 4.5 Energy balance



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SUMMARY
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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:

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 vacuum pressure into the cylinder through its downward motion. The piston is moving down as air is being sucked in by the downward motion against the piston.
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 valve.These four strokes can be remembered by the colloquial phrase, "Suck, Squeeze, Bang, Blow".