X-Mozilla-Keys:                                                                                 
Fred wrote:

No question about it: parallel flow is bad news any way you look at it.

Counter flow makes slightly more sense for oil coolers because the oil flow
rate is lower than the coolant flow rate, and the specific heat oil is about
half that of the coolant so the capacity ratio of an oil cooler is greater
than for a radiator.  I have calculated and ploted flow rates and temperature
drops for coolant and oil for rotary engines as a function of horsepower and
will send shortly.

Fred

 
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