cold revving

[TBITB]

every morning, the woman a few houses down gets in her '00-02 maxima and revs the engine for about five minutes. she revs slow, fast, and sustains a high rpm for a significant time. it's kinda annoying

i was told that doing stuff like that, especially in the winter time, is like waking up in below freezing temps and running outside naked . and it can damage the engine. the oil isn't properly warmed to lubricate the moving parts for hard revving right? i am cool with this person so i want to have the facts before i tell her shes gonna blow up her engine!

[hotrice]

well i have a couple buddies who have xb's that have a special guage on their dash that tells them the ideal temp before driving off but for some reason the tc doesn't in my personal experience i have always let the car run for a couple minutes so that the oil can run through the engine.

[TBITB]

thats what i do too especially in the winter time.

[Soulbane]

That is extremely bad for the car.

Excessive idle revving isn't good for your car as is, and revving to mid and high rpms before your carm warms is just asking for future troubles.

It's temperature shock, and it applies to everything. Ever put ice cubes into warmer temperature liquids? The cubes break or shatter. If substances are forced to change temperatures at a overly rapid rate, the molecular structure's strength and integrity of that substance is compromised. Just like you don't dunk a searing hot skillet into a tub of cold water to clean it. This isn't any "autmotive myth" or what not, it's just straight science.

Let her do what she wants to do. I just start the car, let it sit for about 4-5minutes and allow the car to reach it's standard idle RPM.

It's not gonna blow up her/his engine, but if kept up for extended periods of time, it will have effects on the longevity of the vehicle.

[08supawhite]

Revving your engine when you first start it up and it's not warm yet will cause premature wear on internal engine parts. This is because after the car has sat overnight or for a substantial amount of time, the oil has had time to drain out of the top of the engine and back down into the oil pan. It takes a minute or two of the engine running to get the oil pumped back up to the top of the engine to start lubricating the moving parts properly. Also the metal parts haven't had enough time to expand properly from temperature change to their operating tolerances.

Also, if you are holding a steady idle (1000-1600 RPM's) it will not hurt your engine in fact, some companies program their ECU's upon startup, to hold around a 1300 RPM level to let the engine properly warm up. Anything in extreme excess of this threshold is destructive to your engine.

As a rule of thumb, until the engine starts to sound/feel normal, I do not drive it.

[n0speedlimit]

reving your rpm's when the car is firts warming up specially in the winter is very hard on the motor over time it will damage it!!

[TBITB]

cool i thought those were the answers to this. i feel bad for that engine. but whatever. i let mine get down to about 1k as well. remote start helps big time as well!

[hotrice]

yep best thin i do is start it and as soon as i see the temp move just a remote bit i head on to where i'm going.

[navylife59]

All this holds true even during the Summer months. If you have an auto, the fluid needs to warm up to a specific temp to operate/lubricate the torque convertor, solenoids, and clutch packs correctly. This holds true to any hydraulic system closed or open loop. Even on a 100 degree day, you should allow your motor a minute to stabilize from a cold start.