I am adapting a Mazda 13B rotary for use in a homebuilt aircraft. I am attempting to use a Setrab LOC (oil-to-water) cooler instead of the factory Mazda oil-to-air cooler. My question is what sequence would be best to run the oil cooler? Should it be before the radiator or after? The oil temp in the rotary must be kept about 190degreesF or less to avoid damaging the rotor oil O-rings. Coolant temp limit is about the same. If the cooler is before the rad then the delta of the system will be lower and thus the oil temp higher. If the cooler is after, it will result in lower oil temps, but the heat will be passed back through the engine. The Mazda uses oil to cool the rotors, so about 1/3 of the cooling is handled by the oil. The engine is about 190hp.
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