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Ed's spread sheet is the basis for the following note and attached pdf file.
At 5600 rpm, he shows 3901 Btu/min being rejected from the Radiators.
Using 50-50 EthyleneGlycol-water, I have calculated the flow rate of water through the radiators required to remove this much heat, as a function of the temperature drop across the radiator (which is the temperature rise across the engine).
You can see that for a reasonable delta-T you would like to have ~20GPM from the pump.
I would be very interested in the actual delta-T that Ed gets on his engine/radiators.
Bill Schertz
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