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Revving a Car EngineYes, revving the engine causes a few things to happen.

If it's a cold engine, you can cause friction wear on the cylinder walls, piston rings, and pistons.

It can cause excess gas to go into the exhaust and ignite in your catalitic converter. Gas ignition in your exhaust melts the ceramic emission filter, which then makes the car run like having potatoes in the tailpipe.

Believe it or not, even though the car isn't in gear, the gears still will turn, so if you rev it up, it'll cause gears to wear down.

Here is more input from others:

  • No its not. just don't overrev it or redline it.
  • Yes it is bad for the engine. Think of it this way, if you rub your hands together hard and fast when they are dry, they get hot quick because of the friction created. When an engine is reved cold, especially after sitting for a period of time, your engine is doing the same thing, oil has drained from some components and hi revs when cold can cause friction wear and damage. When hot, reving the engine when not in gear can also cause vibration wear and damage. Car engines were designed to be reved under load( in gear, driving). When it is freewheeling( in nuetral\park) the engine can speed up too quickly, because it does not have the mass to balance and push against, causing it to vibrate violently and at the extreme break.
  • I'm not sure why you'd want to rev the engine, but if you're going to do it, just don't do it when the engine is cold and don't rev it to redline and especially don't hold it revving for an extended period of time. If you're talking about a racing scenario, a few "blips" of the throttle prior to punching it won't hurt anything, but don't rev your engine up and then shut the ignition off.
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โˆ™ 2014-06-03 22:41:34
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Q: Is revving a car engine bad for it?
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What effect does excessive revving have on your car engine?

Excessive revving of an engine causes overpressure in the crankcase. It causes unhealthy expansion in the pistons and the valves.


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No revving your engine dosent damage it.


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Spinning the tires in snow to get unstuck while revving the engine is bad for the car. This is bad for the transmission on the car. The best way to get unstuck in the snow, is to use the car mats to free the car by placing them just to the front of all wheels, then gently stepping on the throttle.


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Revving your engine past its shift points is never a good idea. Unless you are on a track day, revving your engine past its limits not only means consuming more gas, but your car starts revving heavily and if you continue to do so, you will damage your transfer case.


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It depends how high you're talking about. If you mean revving all the way to the red line then yes this is bad for the engine. But the rpm shouldn't exceed 4000 rpm. If it is slightly below this then it is fine.


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Increasing the rpm (revolutions per minute) would be revving the engine.


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