Lorn:

"Air cooled" is a bit of a misnomer as a significant amount of the heat
produced in our "air-cooled" engines IS removed by the oil/oil cooler. In
addition to providing the necessary lubrication to the sliding and rotating
parts, the oil is pumped and splashed on and through most of the engine,
cooling those parts and dumping the heat to the air flowing through the oil
cooler.

Doesn't do much for the cylinder heads directly though, so some kind of
liquid cooling up there would be beneficial, in my humble opinion.

Dan Schaefer