Colder air = more dense air which in turn requires more fuel for a
stoichemtric burn = greater energy release = more power on the power
stroke. Makes sense. A super-charger - turbo or otherwise - does the
same thing except even more dense air needing more fuel , etc, etc, etc.
But anything one can do to increase air density always helps the power
situation. Cooling the burn helps too if applied at the right time.
Certain internally supercharged WW II aircraft engines in fighters has
water injection that was use to produce "military power" in the engine
in the case of emergency. Full throttle with a supercharged engine would
blow the thing up but the water cooled it enough to save the engine but
still get the power. Saved a lot of fighter pilots butts during WW II.

John

On 4/13/2013 11:54 AM, Don Hanson wrote:
> All accepted wisdom says a colder intake air charge improves combustion
> and increases power...