The air conditioning stuff is pressure rated much higher than is the heater
stuff by about 100 PSI. It is aluminum rather than brass and copper. So, the
aluminum is a bit better at dumping heat. So, the aluminum piece could be
smaller than the brass and perform as well. There are hundreds of shapes and
sizes of both, so there is an exact shape for your needs out there. Find out
what car used the shape you want. Pull one at a You Pick It yard. Make sure
there is still pressure in the system you open. Freon systems can hold pressure
for years. Warm up the radiator to drain out as much oil as is possible. Have a
really good welder TIG on some AN fittings to suit your system. I wrap the piece
in a big wet towel or submerge all but the weld area in water. Piece of cake. Or
send it to Tech Welding to build a custom piece from scratch.
The racer uses 3 , 44row Setrab coolers. Just enough to hold 160 degrees at
full tilt. About 250 HP. A bit more than 1/3 of all engine cooling is done
through the oil. You can watch the oil temp go up and down with the throttle
setting. In 1980 our first rotary powered RX-2 had one big GM evap core and
worked fine, but that first engine probably had less than 150 HP.
Lynn E. Hanover
In a message dated 5/29/2017 6:57:15 P.M. Eastern Daylight Time,
flyrotary@lancaironline.net writes:
Ok thanks Lynn ... but is there anything to be gained from switching to an
evaporator core Vs a heater core in terms of performance or durability?
Jeff