I've been tempted to get some stainless steel tubing and bend it to make a large coil between the 1st and 2nd stages and use a fan on that, same with the 2nd stage output.....
Do it with caution. Modifying the tube of the the first-stage output is probably OK as the pressure is not very high. It's unnecessary to do the same for the second stage output as the hot air is leaving the compressor there. Cooling those air will not help the compressor at all. You can see from the picture in my post above that on the Hill compressor, the tube coming out from the 3rd stage is not routed to the cooling fan. There is simply no such need.
I believe this method of cooling is less effective on 2-stagers like the Yong Heng because there is just one point for heat dissipation ( outputs of stage 1 ) along the path of compression. The Hill has one more point for the purpose ( outputs of stage 1 AND 2 )
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