In searching for a radiator I found that NASCAR uses oil to air

exchanges in conjunction with radiators to take care of cooling (C&R

catalog).  I know that this was talked about before. Tracy experimented

with water cooling the oil pan.  C&R integrates a 13 plate unit into the

rad.  There are also remote mounted, 22 plate external oil to water

exchangers available.  By using the available duct space for one rad, it

could be 20" X 18" X 2.75"thick.  The duct would have only one core to

provide uniform airflow to. Any thoughts on this? 

Seems like a good idea. Based on some scaling, I’d estimate that much radiator area/volume would be good for about 200hp.  The question is the split between oil and coolant areas.  Designs typical to piston engines would be short on oil cooling for the rotary.  Perhaps C&R would custom make one to about 1/3 – 2/3.

 

Another observation; we

use the 20" X 4" 2nd gen oil cooler successfully yet Mazda makes a 20" X

6.5" cooler for racing.  Racing places more heat loads into the system then

an aircraft application.

 

That depends on a lot of factors, but for comp max engine hp the aircraft may have a higher average load.  Typical track racing includes some throttle off deceleration time which we rarely do in the air except when descending.

 

Al