Quote:
Originally Posted by JohnnyDaJackal
Thanks for the replies, those we're some detailed responses 
I'm little confused with the cold air in the winter. How exactly does the air 'warm' up in the winter time after driving? Is this where the blowback from the PCV system play a role and recycle warm blowback? Or does the heat from the engine bay itself 'warm' up the air that is being drawn in, or is it both? I know on my father's old carburetor'd corolla their is a heat pipe running from his intake manifold to the front of his air intake duct. I remember someone from an auto store was telling me it's to warm up the air in the winter, I guess the same theory would apply to above? |
I would have to say the engine bay in general. Heat is radiating everywhere under the hood. As for wanting to warm the air, allow me to shed some light.
Oldsmobile Motorsports at Radison 200 - AutoWorld.Com
Though this is an example of how altitude effects engine performance it is very much the same principal. before the map sensor or baro sensor were introduced as people traveled, the higher the altitude the reached the worse their vehicle ran which required frequent adjustments.
The denser the air, the higher oxegen content due to more molecules covering the same space. so the answer is the colder the air that comes into an engine the better.