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Engine noise
On a Porsche 911 air cooled engine cooling is a combination of air being blown over the cylinders and head fins by the engine driven fan, and by the circulating engine oil removing heat from the engine and returning it via the oil cooler to the tank (dry sump) the oil acting as a medium to transfer the heat away from the engine components. One of the reasons I believe that Porsche went to water cooling was to quieten the motor sound to comply with noise control legislation in some countries, ie Switzerland
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