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Two-stroke engine facts for kids

Kids Encyclopedia Facts
Two-Stroke Engine
Animation of two-stroke engine

The two-stroke engine is an internal combustion engine. The two strokes are:

Stroke Number Piston Intake port Exhaust port
bottom dead centre open open
compression 1 piston rising closed closed
top dead centre closed closed
firing 2 piston descending closed closed

Unlike a four-stroke engine, there are no intake and exhaust strokes. When the piston is at bottom dead centre, fuel-air mixture is blown in under slight pressure. The incoming mixture forces out the exhaust gas at the same time. The animation shows an engine with crankcase compression to force in the fuel-air mixture. Some engines use a rotary blower instead.

Images for kids

  • Saab 96 Sport

    1966 Saab Sport

  • BritishSeagull2

    Lateral view of a two-stroke Forty series British Seagull outboard engine, the serial number dates it to 1954/1955

  • Two-stroke deflector piston (Autocar Handbook, 13th ed, 1935)

    Deflector piston with cross-flow scavenging

  • BronsV8

    Brons two-stroke V8 diesel engine driving an N.V. Heemaf generator

See also

Kids robot.svg In Spanish: Motor de dos tiempos para niños

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Two-stroke engine Facts for Kids. Kiddle Encyclopedia.