If anyone with a proven cooling system design for the 20B can

provide radiator sizes and source(s), it would be most welcome.

Phil White

 

Phil;

 

For my 20B in the Velocity I have two coolant radiators; one in the cowl that is 11.5” x 16” x 2.5” (460 cu. in.) from Ron Davis Racing; and one in the wing root that is 6.5” x 22” x 3” (430 cu. in.) from Griffin.  I have an in-line thermostat in the circuit for the wing root rad, and except for very hot days it is only operating during climb.  I have a small oil/water HX in-line with the rad in the cowl, and in typical cruise, that rad handles the coolant heat load, and about 30% of the oil heat load, and the coolant still runs about 150F.

 

I have a large custom oil cooler in the other wing root that is about 5” x 22” x 3.3” (365 cu. in.).  The scoop/diffuser feeding this is not optimum, which led to the addition of the water/oil HX.  My oil temps typically run about 10-20 above coolant temp.

 

Al G (my plane also gained about 100 lbs.  Seems to be a common ailment)