dikman Report post Posted July 25, 2022 6 hours ago, sbrownn said: The heat comes from compressing the air; the motor heat is insignificant by comparison. Ordinarily I would agree, but in this case the piston assembly is shielded from the motor by a "bulkhead", for want of a better term, and while the head gets hot it's nowhere near as hot as the area of the casing that's above the motor coils. I've taken temperature readings to try and localise the main source of the heat. The fan on top keeps the cylinder head noticeably cooler, the motor only slightly so. It's just poor design of the motor housing. Fred, thanks for that, lots of interesting stuff to look through there! Quote Share this post Link to post Share on other sites
