internal-combustion enginein·ter·nal-com·bus·tion engine
one cycle of a four-stroke diesel engine
A. intake stroke
B. compression stroke
C. power stroke
D. exhaust stroke
(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.