Zaphod A8

Is it bad for an engine to be revved in neutral? Assuming the engine is not cold, and you aren't peging it off the rpm limiter or anything blatantly silly, but just goosing the gas without a load on the engine. Probably 3/4 throttle and off a few times. Specificaly I am talking about a pushrod like the LS2, but also aplicable to our 4.2L engines or motorcycles, or other fun things that go vroom.

Thanks for any input!

sack lunch

good to do often b/c there is no airflow over the car to cool the engine. Whether or not this is baloney is beyond me, because obviously people are revving their engines without them overheating. Anyway, I'd like a definitive answer as well, if there is such a thing.

ex-a8drifter

huge deal in revving engines. Its not like you're doing it all the time. I think if you take into account the duration of even constant revving at every traffic light compared to the running life of the engine, I'm sure its nominal.

Rtrn4Deposit

You are still using the engine - since a motor has a finite number of rotations before it needs service, you are using up some of those revolutions for no mechanical gain (except maybe a grin on your face).

Since there is minimal load on the engine beyond friction and the weight of the rotating masses (flywheel, crankshaft, etc) as long as you don't overdo it or overheat the motor (aircooled), it should have minimal effects on the longevity of the engine.

Angus Beef

engine, no. real bad for a ZF trans though

dimitristx

..feel better to be worked at at 5K RPMs in 2nd gear than 5K RPMs in neutral??!

ex-a8drifter

pressure and somethin or another! ; - )

tozoM8

The tranny is inactive until you shift out of P.

dimitristx

Ok, so the ZF doesn't treat P and N as equal states. Got it.

ryoung

And with no load on the engine, it'd be almost impossible to overheat. The A/C at idle is a bigger load.