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During the 1920s and 30s there was a great debate in the aviation industry about the merits of air-cooled vs. liquid-cooled designs. At the beginning of this period, the liquid used for cooling was water at ambient pressure. The amount of heat carried away by a fluid is a function of its capacity and the difference in input and output temperatures.
Consider two cooling systems that are otherwise similar, operating at an ambient air temperature of 20 °C. An all-liquid design might operate between 30 °C and 90 °C, offering 60 °C of temperature difference to carry away heat. An evaporative cooling system might operate between 80 °C and 110 °C.
The 380 and 550 engines were air-cooled with a system marketed by Suzuki as Ram Air. [1] This system consisted of a cast aluminum shroud covering a modified cylinder head to direct the cooling air. The GT750 was liquid-cooled. Suzuki thus led the motorcycle world by being the first company to mass-produce a liquid-cooled, large-bore two-stroke ...
Internal combustion engine cooling uses either air or liquid to remove the waste heat from an internal combustion engine. For small or special purpose engines, cooling using air from the atmosphere makes for a lightweight and relatively simple system. Watercraft can use water directly from the surrounding environment to cool their engines.
If air-cooling proves sufficient for much of the running time (such as for an aero-engine in flight, or a motorcycle in motion), then oil cooling is an ideal way to cope with those times when extra cooling is needed (such as an aero-engine taxiing before take-off, or a motorcycle in a city traffic jam).
The cooling effect of this fan is enough to prevent the engine overheating in most conditions, so liquid-cooled bikes are safe to use in a city, where traffic may frequently be at a standstill. Emissions regulations and the market demand for maximum power are driving the motorcycle industry to liquid-cooling for most motorcycles.
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