Would an engine produce more power in cold weather?
I was thinking this morning (bitterly cold) on my way to work.
Performance cars use an intercooler to cool the incoming air charge, as when air is cooler it is more dense, allowing more air molecules to enter the engine, and increasing the speed at which the charge expands during combustion.
Would a cold ambient temperature achieve something like this?

Yes.

Intercooler is for forced induction, as compressing the air, raises temperature as well as the turbo gets quite hot, so getting this cooled back to ambient temperature is desirable.

Cold air is more dense as is cold fuel (always fill up at night you get more for your money) so as MDM says above it can increase power, although I would say this morning was not bitterly cold, last winter when it was minus 10 was good for the engine power...

StevenRB45 said:

Cold air is more dense as is cold fuel (always fill up at night you get more for your money) so as MDM says above it can increase power, although I would say this morning was not bitterly cold, last winter when it was minus 10 was good for the engine power...

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Fuel is stored below ground where the ambient temperature is generally fairly constant. Also, if there were any real difference, I would imagine the pumps would have something built in to ensure they deliver a precise amount else they would be in so much trouble if weights & measures came round on a hot, sunny day, poured out a measured litre & found they were getting less than stated.

StevenRB45 said:

Cold air is more dense as is cold fuel (always fill up at night you get more for your money) so as MDM says above it can increase power, although I would say this morning was not bitterly cold, last winter when it was minus 10 was good for the engine power...

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Rubbish, 30l is still 30l, just the density that is different which is different to to quantity