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Hey.. I dont kno where to post this so i juss picked here... alrite well this is a Myth or Fact question.... I heard that rite when u start ur car.. rom when u havent driven it for a while... until ur engine is cold... ( you can tell by when that engine heat thing is all the way low).. well i heard when its that cold.. ur not suposed to rev ur car up really high.. because it messes up the engine or sumthin... is this True? or not.. because... theres cold air intakes.. and they bring cold air in the engine... so heres my main question..

Would your car be faster when that engine temp is ALL the way low? or would it not make a difference...? and will it mess up the engine?

 
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you don't wanna rev your engine too high immediately after you start it. The temperature of the air coming in your intake has nothing to do with that. Also, the air in cold air intakes isn't THAT much cooler than a short ram.

 
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From my understanding, and I'm no mechanic, you don't want to rev your engine immediately after you start it because as your engine sits for a long period of time (overnight) the oil drains down into the oil pan. Well because your engine vitals aren't properly lubricated until the engine is running for a little bit, it's not a good idea to put them through more stress. But who knows, I might be wrong. Just my 2 cents.

 
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You're correct. Also it is temp. You wouldn't eat raw chicken so just don't rev too high when you just start your car. With a CAI you'retaking air from below your engine bay, but there is still radient heat there so it really isn't much cooler, like was said by 01civic. Likewise with speed, your engine will run the quickest when it has been running for a little bit of time to be properly warmed up, but the outside temp is low.

 
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When everything cools off, it also contracts. So when you start it cold everything is tight. As it warms up, all the metal expands a little bit and the engine loosens up to a full operating state. Then you're good to go. Thats why your car "starts hard" in the winter outside... the engine is like 20 degrees, everything contracts and the starter has a tough time making it turn over.