Two-Cycle Engine

two-cycle engine

[′tü ¦sī·kəl ′en·jən]
(mechanical engineering)
A reciprocating internal combustion engine that requires two piston strokes or one revolution to complete a cycle.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Two-Cycle Engine


an internal combustion engine in which the work cycle is completed during one revolution of the crankshaft. The cycle includes intake of the fuel mixture (or air), compression, and combustion, as well as expansion and exhaust of gases; the whole cycle is completed during two strokes of the piston.

A part of the fresh charge entering the cylinder is invariably lost through the exhaust openings during the scavenging part of the cycle. This loss lowers the economic efficiency of the two-cycle engine. This type of engine also has the disadvantage of a high thermal loading of the piston, tending to lower the reliability of the engine. A complicated exhaust-scavenging arrangement is an additional disadvantage.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Above the power cylinder piston, the engine operates in a similar method to a Schnurle [27][28] loop scavenged two-cycle engine but with major key differences.
We decided to go back to the drawing board to create a product that would work and survive the harsh environment of a two-cycle engine."
There wasn't a single Detroit Diesel two-cycle engine on display and with the exception of a VM Motori air-cooled in-line six, all of the engines also featured electronic controls.
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Stephen Foster Briggs developed a six-cylinder, two-cycle engine as an engineering student at South Dakota State College.
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Spectrum is an independent blender, packager and marketer of specialty lubricants including two-cycle engine oil, small engine oil and hydraulic oil.
Ethanol is a big issue in the chainsaw and two-cycle engine community.
Michael Kaergaard Madsen and Jesper Lykke Rasmussen of Vejle, Denmark, won for developing a prototype of a two-cycle engine that pushes unused gas back into the cylinder so that it is burned instead of wasted.
The Express has a two-cycle engine that will propel a rider to 30 MPH, which classifies it as a moped in all 50 states.
And even a mint-condition Trabant, the once-despised East German car with a two-cycle engine that now has a certain nostalgic chic, putt-putting its way along St.

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