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[fawr-sahy-kuh l, fohr-] /ˈfɔrˌsaɪ kəl, ˈfoʊr-/
noting or pertaining to an internal-combustion engine in which a complete cycle in each cylinder requires four strokes, one to draw in air or an air-fuel mixture, one to compress it, one to ignite it and do work, and one to scavenge the cylinder.
Also, four-stroke.
Compare two-cycle.
Origin of four-cycle
First recorded in 1905-10 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for four-cycle
Historical Examples
  • This is true with either one of two forms of four-cycle motors.

    Aviation Engines

    Victor Wilfred Pag
  • Thus it is plain that the motor is of the four-cycle type and it should not be confounded with two-cycle motors.

  • The average compression pressure of a two- or four-cycle engine of the ordinary type, is from 60 to 70 pounds per square inch.

    The Gasoline Motor

    Harold Whiting Slauson
  • At the top is shown the torque diagram of a single-cylinder motor of the four-cycle type.

    Aviation Engines

    Victor Wilfred Pag
  • It shows clearly all parts of a typical four-cylinder gasoline engine of the four-cycle type.

    Aviation Engines

    Victor Wilfred Pag
  • The four-cycle engines have been so far subjected to much more rigid and authoritative tests than those of the two-cycle.

  • As to disadvantages:—In a four-cycle engine there is but one working stroke in four piston traverses.

    Inventors at Work George Iles
  • In a four-cycle engine the piston must travel twice up and down in each cylinder, to deliver one power stroke.

    Electricity for the farm Frederick Irving Anderson
  • The greater number of engines used in automobiles to-day are of the kind known as the Otto cycle, or four-cycle, engine.

    The Story of Great Inventions Elmer Ellsworth Burns
  • The two-cycle engine is simpler in construction than the four-cycle, having no valves.

    The Story of Great Inventions Elmer Ellsworth Burns
British Dictionary definitions for four-cycle


(US & Canadian) relating to or designating an internal-combustion engine in which the piston makes four strokes for every explosion Equivalent term (in Britain and certain other countries) four-stroke Compare two-stroke
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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