When it comes to the more precise cooling liquid dosage, traditional pumps will always work at a speed that is proportional to the speed of the crankshaft. In short, the mechanical pumps are usually belt driven, which means they “steal” some of the power produced by the engine to get the anti-freeze flowing. The margin of error is smaller, allowing for precise dosing and monitoring of anti-freeze. The main benefits of this solution are no parasitic energy losses and a greater control over how much coolant gets provided to the engine. Interestingly, the N20s have an electric water pump, instead of a more traditional mechanical one – a technology that is rarely used in newer cars.
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