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It's why nitrous works, as well. I want some... (archive)

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Posted by Tim on May 16, 2001 at 11:02:06:

In Reply to: Re: Car noticeably slower in the heat - normal? (m posted by Mike Chiang on May 16, 2001 at 10:43:57:

Its not heat transfer. But a matter of air density: the colder air is, the denser it gets. Therefore, you acheive greater cylinder fill as the air temp goes down. More air in the engine, more air to burn, more power.

5% horsepower loss for every 10 degrees above 75F. is what I recall hearing. That's not a scientific formula, but a pall-park estimate.


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