Quote:
Originally Posted by raolc
From what I understand, when the car is running hotter it has a little bit less power than when its running cold. A friend explained it to me, forgot his reasoning, but it made sence when hew as explaining it. He was mainly talking about how it was easier to get power out of the older engines that ran cooler but now engines have to run hotter because of emissions so its harder to get the power. What do you guys think? Is that why his car may feel faster when its colder? Anyone know what my friend is talking about and can add to it, or may be that doesn't apply to these engines...
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air density decreases as temperature goes up, aka cool air is more dense than warm air. this has 2 major benefits that i know of:
- you can pack "more" air into the cylinders and hence more fuel, leading to a bigger explosion upon combustion
- there's a bigger temp difference between the air intake charge and the burning fuel, making the combustion process more efficient
anyone else wanna chime in on this?