Quote:
Originally Posted by kmusa
Mounting fins to the motor case may work, but most of the heat is being generated in the cylinder, and not in the motor (Viair, for instance, specifically mentions not mounting the compressor upside down, because they find that more heat transfers from the cylinder to the motor.)
What we found is that just having a fan blow on the cylinder head kept the compressor temperature reasonable.
-Karlis
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We also had fan blowing at the cylinder head. However we also found that our compressor was so overworked that motor was very hot as well. May be not hot enough to cause 1st degree burns, but I wasn't dumb enough to test that

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One of the reason for extra working time probably due to a minor pressure loss that we were unable to locate. I soped the heck out of it and didn't see any bubbles
As I looked at the design I posted it occurred to me that it is perhaps an overkill. I will put more thought to it and if I can make it simpler while still effective.