![]() For many single-cylinder motorcycle engines, idle speed is set between 12 rpm. For medium and heavy duty trucks, it is approximately 600 rpm. The opposite of idle speed is redline, the maximum rotational speed the engine can be run out without risking serious engine damage.Ĭar, truck, and motorcycle engines įor a passenger car engine, idle speed is customarily between 6 rpm. At idle speed, the engine generates enough power to run reasonably smoothly and operate its ancillaries ( water pump, alternator, and, if equipped, other accessories such as power steering), but usually not enough to perform useful work, such as moving an automobile. ![]() In combustion engines, idle speed is generally measured in revolutions per minute (rpm) of the crankshaft. Idle speed, sometimes simply called " idle", is the rotational speed an engine runs at when the engine is idling, that is when the engine is uncoupled from the drivetrain and the throttle pedal is not depressed. ![]() Tachometer (left) of a Volkswagen Golf Mk6 passenger car idling at just below 800 r/min. ![]()
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