Idle (engine)

s idling in Hong Kong Idling refers to running a vehicle's engine and the vehicle is not in motion, or when the vehicle drops to its resting point of RPMs. This commonly occurs when drivers are stopped at a red light, waiting while parked outside a business or residence, or otherwise stationary with the engine running. When idling, the engine runs without any loads except the engine accessories, and without the additional fuel via the gas pedal. If the vehicle moves while in gear and idling, the "idle speed" mechanically should be adjusted.

s idling in Hong Kong]] Idling refers to running a vehicle's engine and the vehicle is not in motion, or when the vehicle drops to its resting point of RPMs. This commonly occurs when drivers are stopped at a red light, waiting while parked outside a business or residence, or otherwise stationary with the engine running. When idling, the engine runs without any loads except the engine accessories, and without the additional fuel via the gas pedal. If the vehicle moves while in gear and idling, the "idle speed" mechanically should be adjusted. ==Idle speed== (left) of a Volkswagen Golf Mk6 passenger car idling at just below 800 r/min.]] 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. In combustion engines, idle speed is generally measured in revolutions per minute (rpm) of the crankshaft. 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 unless it is set too high. The opposite of idle speed is redline, the maximum rotational speed the engine can be run at without risking serious engine damage. ==Anti-idling legislation== === Belgium=== Idling is forbidden unless there is a specific reason to do so (version 1975-2026, art. 8.6 ), to be superseded by version 2026-09, art. 8.7 ===Canada=== The city of Toronto enacted the first idling bylaw (No. 673-1998 Chapter 517 in the Municipal Code) in Canada in 1996 to reduce idle time to 3 minutes for vehicles and marine vessels. There are plans by the health department to ask for the bylaw to be amended to a limit of one minute and no exemptions to be made for the city's fleet, including the Toronto Transit Commission buses. Other Canadian municipalities have followed Toronto's lead: Mississauga, Ontario Idling Control By-law, 194-2009 Oakville, Ontario Anti-Idling Bylaw 2002-153 Waterloo, Ontario By-law 2009-077 Red Deer, Alberta (2009) Sudbury, Ontario (Campaign only 2010) Dawson Creek, British Columbia (Dawson Creek's Energy Plan municipal fleet only) Vancouver, British Columbia (2006) Hamilton, Ontario (2007) Ajax, Ontario (2009) Ottawa, Ontario Vaughan, Ontario ==See also== Idle reduction Revolutions per minute ==References==

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