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Does anyone know the flow rate and temp drop for S38B36 radiator ?

What's the average temp in and out of the radiator ?

I'm away from the M5s for the next few days , the temp I can measure later if nobody has it handy but the flow rate ?

How do you calculate that ?
 

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temp drop depends on ambient temperature, vehicle speed, wind, flowrate through the radiator, collant temperature, coolant thermal properties
 

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What you are asking is a heat transfer question.
Heat transfer is typically stated in terms of thermal conductivity rather than a differential temp in degrees.

The answer is not very straight forward and in reality the actual temp drop in degrees is highly variable based on radiator's thermal conductivity, coolant flow rate, air flow, air temp and air humidity.

The radiator thermal conductivity could be determined by accurately measuring the coolant inlet temp, coolant specific gravity, coolant flow rate, air flow/temp/humidity and coolant outlet temperature. I anticipate the radiator core manufacture has the thermal conductivity value for their cores.

Just another one of the many vehicle engineering problems with more to it than meets the eye.
 
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