Air compressor question?

[ih8gmandford]

 Yikes! Looks like it's looking for an excuse to blow off... hopefully through the roof and not someone's skull! If that's a 110psi safety valve, and you have 145psi in the tank, the valve is junk. Try to find one that's rated at 175psi - they're fairly cheap ($10 or so) and you MUST have one.
Knowing if the pump is pressure lube or splash lube isn't easy unless you are willing to pull the pump apart. The front plate appears to be a centrifugal unloader to allow the unit to run unloaded until up to speed. The oil pump may be mounted in the cover too, but I'm not sure how. EVERY pressure lube unit that I have worked on has a oil pressure gauge on it, and they will usually have a hydraulic unloader instead of the centrifugal one. That's how the Quincy and Speed Air pumps are, at least.
I'm not a fan of the sweated copper pipe for a discharge line, either. I always use black pipe or refrig grade copper tubing bent into shape w/ compression fittings. Just my preference, though. -Jason

[Todd Wilson]

I dont think I would want your set up to put more then about 120lbs into the tank. Glad to hear you went back to the old pulley. That old unit will run forever if you leave it alone and dont push it! I love old equipment like that! If the WABCO is the same WABCO thats on the railroad thats a Westinghoue Air Brake company compressor.

They basically designed the air brake system on trains.


Todd

[elacruze]

Ok I switched to a 6" pulley and checked the amp draw. It pulls 12 amps at start up and just under 6 amps when running, interestingly it only cut about 10 sec. off the cycle time.
Dont feel good about that so I went back to the 4" pulley.
I think you're right about the LP restrictiction because the bores look great with no ridge at the top and the picture I posted shows how restricted the low pressure intake valve was, you wouldn't believe all the junk I cleaned out of it.
I'm going to run it awhile and pull the head to see if there's still oil getting past the rings. The tank say's "Max. allowable working pressure is 200lbs" which I'm assuming is 200psi?
Thanks for the info Jason, I'll set the pressure cut-in cut-out like you said and give it a run.

Glad my math was close, anyway. Curious, what's your cycle time?
If the working pressure is good to 200psi, definitely follow Jason's lead and get the pressure up. Maybe the extra speed just isn't supported by the ports and valves well enough to increase the volume at the same rate as RPMs.