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". and a normally aspirated engine is capable of less than 50% power, the
flow through the radiator is very small. The low flow will unload the water
pump and the power used is insignificant. The low flow will also allow the
coolant to freeze in the radiator"
I'd say that 50% power does not mean you would not have significant RPM or
low flow from the water pump. Automotive water pumps are designed for
adequate cooling flow at low RPM and have significant excess capacity at