Fred  wrote:

This is similar to the coolant flow case.  The rotary engine dumps a lot of
heat into the oil, and so high oil flows are necessary to carry it away.  I
somewhat arbitrarily specified a 20 degree F temperature rise and drop as
good, but this requires a lot of oil flow.  With a 40 degree F temperature
rise and fall, the exit temperature from the oil cooler is down to about 150F
assuming 210F inlet temperature, and you are starting to lose temperature
difference between oil temperature and ambient on a hot day.  This requires
the use of a larger oil cooler.  Better to flow more oil if you can.
Otherwise you need a big oil cooler as I believe many are finding out.

Fred

 
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