Help identify single stage 4 cylinder compressor pump

[bcsmith]

I need help identifying this air compressor pump. It is a four cylinder, single stage pump, it is NOT cast iron, and appears to be pressure lubricated based on the gauge near the shaft end. I do not know if the pulley currently on it is the original, but it has been welded to prevent it from idling. The pump shaft is tapered.

I'd like to mainly find the spec for minimum operating speed, as I'd like to slow it down to keep it as quiet as possible. The pump will probably eventually be replaced by a bigger cast iron old one when I can find one at the right price (close to free).

If any additional info would be helpful, I will do my best to supply it. I can find no markings on the pump other than casting numbers such as the one on the crankcase, and it is on a frankencompressor, so no other clues. Thanks.

Ben

 

[roalco]

I don't know about yours, but I have a 2cyl 2stage aluminum bodied compressor that also has a cast aluminum finned intercooler, and a similar look to yours. It took me years of searching and I finally found that it was an Italian head, marketed some years ago in NA by DevilBiss. Yours may be similar. Nice compressors, Good luck!

 

[bcsmith]

I forgot to mention that the pump is not terribly large, probably weighs 80 pounds at most. The pulley on it is probably about 7" diameter if I had to guess.

 

[Fixnair]

It looks like an automotive setup. That pulley is also a 12v electric clutch. Maybe it was set up in a truck and driven off the engine. That pulley is too small to use with an electric motor. You would need a motor pulley around 1" to keep the compressor speed down to a reasonable level. You would need something a 3 HP motor to drive it.

 

[G_P]

It looks like an automotive setup. That pulley is also a 12v electric clutch. Maybe it was set up in a truck and driven off the engine. That pulley is too small to use with an electric motor. You would need a motor pulley around 1" to keep the compressor speed down to a reasonable level. You would need something a 3 HP motor to drive it.

Exactly what I was thinking. Probably off of a service truck. I wonder if all that weld on the pulley has thrown the balance off enough to cause issues.

 

[64Trvlr]

I have no idea what it is but it looks a lot like mine. It's not exact but closer than anything I've seen on here so far.

 

[bcsmith]

It looks like an automotive setup. That pulley is also a 12v electric clutch. Maybe it was set up in a truck and driven off the engine. That pulley is too small to use with an electric motor. You would need a motor pulley around 1" to keep the compressor speed down to a reasonable level. You would need something a 3 HP motor to drive it.

If the pulley on it is original, I figured it was probably engine-driven originally, though I assumed it would be a standalone setup, and not driven by the truck engine. I had always assumed compressors driven by an automotive engine have rather different mounting brackets. By the way, the guts of the clutch in the pulley are gone, so the welds are the only reason the shaft spins.

I had planned on replacing the pulley, but want to find the minimum RPM spec before I settle on the size. Is the tapered shaft size pretty much universal for pumps with tapered shafts, or do I need to figure out which taper size it is to get the right fit? Anybody know the official name for the taper and size, or where I might look it up from measurements?

I'm not planning on putting much money into this setup as I would rather apply funds toward a different cast iron pump. I might just set up a jackshaft if I can't find a cheap pulley.