Thanks burgie. I have several motorcycle radiators. Could I use those to achieve same goal. Your compressor is awesome. I really like the square tubing mount. I would like to mount a hose reel to one side(compressor is outside). Did you just through-bolt it to the tank plate?
Unless you have AC on those MC

I don't think they would work.
The aftercooler has to take pressures of 130 thru 175psi depending on the compressor. Most radiators are designed for 15psi operating pressures.
Some MC's have oil coolers, but doubt they would be large enough to do much.
Look for a Oil cooler, dedicated aftercooler, or possibly a condenser from a AC unit. Some have used coiled copper tube over a fan, in a bucket of water, or ran it thru a refrigerator.