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Originally Posted by Jager
Yes they are... Now if we can just get rid of that liquid loop in between.
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Water has 4x the heat carrying capacity and 30x the conductivity of air. So it can carry more heat and it can pull it away much faster than air can. This means it does a much better job of reducing hot spots and takes much less energy to reduce temperatures than localized airflow would. Once the heat is in the front of the car, it's easy to move it to the air efficiently. Engines would have to be heavier and physically larger than they are to air cool them directly.
It's better this way.
Now if water pump housings were not part of the engine block and easy to get to like they were before the 80s, that would be nice.