Uniflow scavenging | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-07-06

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Two-stroke_engine


00:00:56 1 History
00:02:26 2 Emissions
00:03:03 3 Applications
00:05:21 4 Different two-stroke design types
00:05:52 4.1 Piston-controlled inlet port
00:07:49 4.2 Reed inlet valve
00:08:19 4.3 Rotary inlet valve
00:10:03 4.4 Cross-flow-scavenged
00:10:55 4.5 Loop-scavenged
00:14:30 4.6 Uniflow-scavenged
00:15:43 4.7 Stepped piston engine
00:16:35 5 Power valve systems
00:17:33 6 Direct injection
00:18:12 7 Diesel
00:19:19 8 Lubrication
00:23:48 9 Two-stroke reversibility
00:27:46 10 See also



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SUMMARY
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A two-stroke (or two-cycle) engine is a type of internal combustion engine which completes a power cycle with two strokes (up and down movements) of the piston during only one crankshaft revolution. This is in contrast to a "four-stroke engine", which requires four strokes of the piston to complete a power cycle during two crankshaft revolutions. In a two-stroke engine, the end of the combustion stroke and the beginning of the compression stroke happen simultaneously, with the intake and exhaust (or scavenging) functions occurring at the same time.
Two-stroke engines often have a high power-to-weight ratio, power being available in a narrow range of rotational speeds called the "power band". Compared to four-stroke engines, two-stroke engines have a greatly reduced number of moving parts, and so can be more compact and significantly lighter.