[Willie B]

I feel it is twin to a Sanborn I had years ago. I paid new $230? For a number of years it worked OK for air chisel, tires, and other light duty air needs. It wouldn't paint, DA sand, sand blast, even in the most limited sense. When the tank leaked, I mounted it on a 100 gallon propane tank which improved the function in the sense I could do all those things for a while. Eventually, it failed to build air. I opened it up to find reed valve. Instead of valves, it had a piece of springy steel obstructing the intake port. Atmospheric pressure leaked by in one direction, by optomistic design, not the other. The reed was toasted, no replacement was available. The anemic not HP rated air compressor got toted out back, and later hauled for scrap.

These days I'm a collector of junk heavy duty air compressors, and band saws. I have several of each. Air supply now is provided by an Ingersoll Rand 5 HP 80 gallon. Not the best on the market, but very functional.

I also have 5 others, most three phase, I haven't actually used. My band saw saga is even sadder.

Buy a good compressor. If your needs include a pancake compressor, I have a Porter Cable nail gun compressor I paid something like $119.99 works great, a Coleman 5? HP (legitimately, 1.5 HP) unit on a vertical 30 galllon tank, and the Ingersoll.

I suggest you pass on the one you show. If you want a project, I offer a couple choices of real compressors needing single phase motors I'd be happy to give you.

 

[Willie B]

OK, the large pulley is 11 13/16ths in diameter. The small pulley is 2 1/4 in diameter, the motor RPM is rated at 3450, so I get a compressor RPM of 657. The bore and stroke of this compressor is 2.75 bore x 2 inch stroke x 2 cylinders. Using the formula Pi*radius squared*height, each stroke of each cylinder produces 11.88 cu inches. At 657 RPM, that comes out to 9 CFM, which is what I measured. I am guessing the motor is not over amped, since its rated draw is 15 amps and it is not tripping any breakers. I could be wrong however. The really tempting experiment would be to put a slightly larger drive pulley on this beast.

Louie, I don't believe you can calculate displacement at barometric pressure for a compressible commodity like air.

 

[Willie B]

Yeah! What he said...maybe??