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Engine
The sound of a machine designed to produce mechanical energy. Combustion engines burn a fuel to create heat, which then creates a force. Electric motors convert electrical energy into mechanical motion. Other classes of engines include pneumatic motors and clockwork motors.
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Light engine (high frequency)
The sound of a small engine such as a toy car, sewing machine, or moped.
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►Medium engine (mid frequency)
The sound of a moderately-sized engine such as that which powers a motorcycle, sedan, or small truck.
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►Heavy engine (low frequency)
The sound of a large, heavy-duty internal combustion engine, such as that which powers a large truck, locomotive, or ship. Jet engines, steam engines, rocket engines etc. are excluded.
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►Jet engine
The sound of an internal combustion airbreathing engine that generates thrust by discharging a fast-moving jet of gas. Jet aircraft use such engines for long-distance travel.
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►Engine knocking
A metallic "pinging" sound caused by a malfunctioning spark-ignited internal combustion engine. Engine knocking indicates that the combustion of the air/fuel mixture in the cylinder is occurring at the wrong point in the piston's stroke.Engine starting
The sound of an engine starting from rest, which may involve a specific starter mechanism (as in a standard car).
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►Idling
The sound of an engine (typically in an automobile) running without any load and at minimal RPM.
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►Accelerating, revving, vroom
The sound made by the engine of a vehicle undergoing acceleration, usually involving an increase in loudness and a rising pitch.
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