an engine, as in an automobile, motorboat, or lawn mower, that obtains its power from heat and pressure produced by the combustion of a fuel-and-air mixture inside one or more closed chambers or cylinders
An engine, such as an automotive gasoline piston engine or a diesel, in which fuel is burned within the engine proper rather than in an external furnace, as in a steam engine.
one cycle of a four-stroke diesel engine
A. intake stroke
B. compression stroke
C. power stroke
D. exhaust stroke
An engine whose fuel is burned inside the engine itself rather than in an outside furnace or burner. Gasoline and diesel engines are internal-combustion engines, as are gas turbine engines such as turbojets.
Compare steam engine
(plural internal combustion engines)
- A piston or a rotary heat engine directly powered by the products of intermittent combustion of a fuel.
- A heat engine in which intermittent or the continuous burning of a fuel takes place inside a combustion chamber; the resulting pressurized gas acts directly on the engine to do useful work, such as a piston engine, gas turbine, jet engine or rocket.