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Compare air and water cooling systems.
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written 8.5 years ago by
teamques10
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| Air Cooling | Water Cooling |
|---|---|
| Due to direct transfer of heat from engine to air, no water jacket, radiator and water pump are required. Therefore weight is reduced. | Need for pump and radiator increases weight and air resistance of vehicle. |
| Engine is smaller in size and its design much simpler. | Engine has larger dimensions and its design is more complex. |
| Warm-up performance of air-cooled engine is better. This results in low wear to cylinders. | Warm-up performance is poor and results in greater cylinder wear. |
| Volumetric efficiency of air-cooled engine is lower due to higher cylinder head temperatures. | Volumetric efficiency of water-cooled engines is higher. |
| Air cooling cannot be employed for high specific output engines due to complex nature of fins required. | Since heat transfer coefficient of water is about 350 times that of air, water cooling can be used for high specific output engines. |
| Air cooled engine can take up some degree of damage. A broken fin does not affect the engine much. | Water cooling system requires more maintenance. A slight leakage of radiator may result in engine breakdown. |
| Air cooled engine is less sensitive to climatic conditions. Anti-freeze solution is not needed. | Engine performance is more sensitive to climatic conditions. Cold weather starting requires use of anti-freeze solutions. |
| Air fan is an additional source of noise. | Presence of water passage attenuates the combustion noise. |
| Control of cooling system is much easier. | Control of cooling system is comparatively difficult. |
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