four-cycle

Intake-compression-power-exhaust sequence

Four-cycle describes an internal combustion engine that completes its power sequence in four strokes of the piston: intake, compression, combustion, and exhaust.

Most car engines are four-cycle, as are many lawnmowers and generators.

Also called four-stroke.

a four-cycle engine

engine

piston

Reciprocating cylinder component

valvetrain · carburetor · flywheel · throttle · gasket · bearings · distributor · alternator

strokes

intake

Amount received or consumed

stroke · ignition · combustion · spark · firing · timing · sequence · rotation · downstroke · upstroke

thermodynamics

efficiency

Productive without waste

  • heatTransferred thermal energy
  • workEffort toward a goal
  • energyPower to do work

isothermal · Carnot · entropy · emissions

equipment

lawnmower

Machine that trims grass

snowblower · pressure-washer · tiller · ATV · scooter

Opposites
engine cycle type

four-cycletwo-stroke

Engine firing each revolution

rotary engine · electric motor · two-stroke engine · turbine

Family

four, fours, fourth, fourths, fourteen, fourteenth, forty, fortieth, fourfold

Familiarity
Top 500,000
Profile
Used worldwide · Timeless · Rated G