Compressor Issue

AAE

Learner
I have a cheap HF 2 stage that I use for smaller stuff. I get really nice finishes with it.

Then, I have a big Quincy that I use for other stuff. I have yet to get a nice finish out of that sucker. The fan looks all chopped and it even sounds different.
The gun is a Prolite.
Both units have the gauges wide open.
Thanks for any help.
 
  • Like
Reactions: Rbm
both compressors just supply the air as you know. as long as they hold psi while you spray and it isnt dropping at all then other than the plumbing from them there is nothing that will change how the gun sprays from one compressor to the other. if the plumbing is the same as far as length, dia and cooling ability then there will be no difference.
 
Little bit of navel gazing here but if both compressor regulators are wide open then the bigger compressor may have a more pulsating output while the compressor is running imho.

Depending on your gun regulator this pulsating may pass to the gun.

What regulator are you using at your gun? It’s not a cheater valve is it?

Don
 
  • Like
Reactions: AAE
both compressors just supply the air as you know. as long as they hold psi while you spray and it isnt dropping at all then other than the plumbing from them there is nothing that will change how the gun sprays from one compressor to the other. if the plumbing is the same as far as length, dia and cooling ability then there will be no difference.
That's what has me confused. As far as piping goes, the small one is practically right from the tank only going through a motorguard filter. The large one runs through around 30ft of copper, a motorguard and a desiccant dryer.
 
Little bit of navel gazing here but if both compressor regulators are wide open then the bigger compressor may have a more pulsating output while the compressor is running imho.

Depending on your gun regulator this pulsating may pass to the gun.

What regulator are you using at your gun? It’s not a cheater valve is it?

Don
The regulator is the Motorguard that Mr. Kives recommends.
 
I'm only asking here, but have you disconnected the filter system on the Quincy compressor just to see if there may be an obstruction there? What size copper line? Maybe something is in the line.
 
I'm only asking here, but have you disconnected the filter system on the Quincy compressor just to see if there may be an obstruction there? What size copper line? Maybe something is in the line.
Mmm, I have been missing my wedding ring.
I haven't done that but it has crossed my mind that maybe there's a flux build up.
 
So not knowing about the fan or chopped up, if you are recompressing air nothing is going to cool that compressor. I dont know if that is part of the problem, but if its running longer its probably part of a problem. You did not really say you are not getting pressure or volume, but:

Quincy's have a knack of floating valves, which leads to recompression of the air in the cylinder making the air terribly hot, leading to hot cylinders, leading to oil blow by, leading to more condensate in the air. The valves are pretty easy to change if you can find them, just a stainless disc with some springs sandwiched in. This just causes them to run longer since they are doubling their work. So if you are really getting moisture or using oil, its a possibility. Most compressors run 32, so you can maybe save some oil going to 46, but really did not get the problems with the finish, so it leads me to believe oil or water if you got pressure.
 
It has to be apples to apples, the exact same setup from tank to gun, before any conclusions can be drawn. I have a strong suspicion that it's NOT the compressor.
You don't expect me to take any blame! It has to be something else's fault! Really though, it's weird how I get really nice finishes from the small unit compared to the large one. I'll just invest in more sandpaper.
 
+1 on determining if there is an obstruction of some sort. Other question is you say "wide open" gauges, the Quincy I think would be outputting something like 150 to more likely 175 psi unregulated. Is that going directly to your gun? If so what regulator are you using at the gun. The HF I suspect is outputting around 125 psi unregulated. Try regulating the Quincy down to whatever the HF is outputting or MAX 125 psi. If there is no obstruction in your piping I bet that solves it.
 
If it's pulsating, it might be a wonky regulator. Could try putting your hand on it while you are spraying to see if you feel anything.
 
  • Like
Reactions: AAE
Back
Top