Rapid Cooling can be achieved. water is a better conductor of heat, than air.
Compact in Design, than that of an Air Cooled one. No need for large fins.
Water is cheap.
Water has to be mixed with coolant alcohol, to prevent freezing and stop corrosion.
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The water cooled engine will typically be heavier, because you have to add in the water pump, the radiator and the water/coolant. The engine block itself may be lighter as there are passages drilled out for the water/coolant to flow through.
An air cooled car will be lighter. The air cooled engine has a single thin walled engine block for air cooling just like an air cooled motorcycle or early VW Beetle. There is no antifreeze, radiator, water pump, hoses, etc, that a water cooled car would have. The water cooled engines have two walls (an inner wall for the pistons, etc, and the outer wall to hold the water) to help carry the water around the hot spots of the motor so you have twice the metal plus the weight of the water, etc. There's probably 200lbs to 300lbs savings.
NO dirt bikes are either air cooled (you will mainly find this on Chinese bikes) or they are cooled by coolant from a radiater, much like the one in your car.
Water or coolant keeps the engine cool . -Some engines are air cooled.
Water cooled.
Not unless you have a water cooled intake manifold, which is very rare on a car.
water cooled is better
Generally, air cooled engines require less maintenance associated with a wet cooling system. Hoses, pumps, and radiators naturally age and eventually will leak or fail in another manner.
If you have your air conditioning running it is the moisture that is pulled out of the air when it is being cooled. That water is then expelled outside of the car
The engine of a car contains many passages through which water can flow. The water picks up excess heat from the car engine and then passes through the radiator, where it is cooled by the rapid flow of air. The cooled water then returns to the engine to pick up more excess heat. So to put it simply: the radiator cools the water which cools the engine.
Its both air and water cooled.