Since I'm still on the disabled list, I don't have much else to do except buy shit and complain about it on the internet.
Today, I present you the Quincy QT-54 Dual-Stage "5 hp" compressor.
My previous smaller compressor went tits up right before I was able to play with my new plasma cutter, so I quickly ordered this unit.
Why did I order a Quincy? Well, according to most internet armchair quarterbacks, Quincy is the gold standard of compressors. While I don't exactly agree with this thought process, I do have experience with pre Atlas-Copco Quincy screw compressors and single-stage verticals. FYI, the true gold standard is a Saylor-Beall, but we will save that for another time.
Let's get into this.
I ordered the compressor from aircompressorsdirect.com on 12/3/18 for $1299 + $35 liftgate and included the $179 maint kit, which extends the warranty from one to three years, which is nice. This includes on-site service.
The compressor that arrived looked like this:
I had aircompressorsdirect.com take the unit back because appeared to have been dropped and re-palletized. On 1/7/19, the replacement finally arrived. They should look like this on the pallet:
After running a second NEMA 6-50 receptacle and building an extension cord, I got the thing up and running. I stuck one of those vibration-based engine hour meters on the frame to track maint. There's plenty of vibration to trigger the hour meter.
Quincy's fit and finish / QA is definitely not the greatest. A couple observations:
- The pump / motor mount plate has a large scratch that was made during assembly. I don't really care.
- The bottom drain valve leaks. Ive tried to tighten it but it still leaks. I'll try removing and re-installing it or calling Quincy to see if they will come out and fix it.
- The petcock valve has debris clogging it. At first I thought this might be ice but it's not. A shaving of sharp metal shot out and cut my finger. Kinda lame, but whatever.
Operation of the unit is to be expected, however, it is LOUD and vibrates quite a bit. Much louder than any 5hp compressor I have ever used. More on why later, here are some dB readings:
All measurements taken at 5' high.
@ 2' from front of unit: 92dB (inside garage)
@ 10' from the front of unit: 86dB (inside garage)
@ 30' from the front of the unit: 78dB (in driveway)
Why all the noise and vibration? My theory is the motor is not a true 5hp Baldor motor. It's a speced motor that spins at a much higher speed than a typical Baldor 5hp. This motor spins at 3450 rpm. I would expect to see a 5hp Baldor spin at ~1750. To add to the disappointment, the motor plate says it all: Any time I see HP: SPL, it's a letdown.
LOL riiiiight guys ^
The motor only uses ~28 amps at running, so I assume it's some kind of more efficient-speced motor. The compressor does not ship with a magnetic starter, so my guess is it's de-rated enough to not need one.
Noise and vibration aside, the pump seems to be decent enough. The first stage compresses to around 90psi, then the second, fed by and intercooler compresses to about 175psi. At full operating temperature, (I ran it for 1hr with the valve open), I notice that the primary stage cylinder sleeve operates at about 190 degrees and the second stage cylinder sleeve is around 170 degrees. This pump is splash lubricated. I assume the temperature difference is normal, partially due to the intercooler.
So, what can it do? According to the pressure gauge, the pump is shutting off at 170 PSI. It will kick back in at 130 PSI. The pressure switch is a Condor MD11, which does not come in a 130 / 170 combo, so I suspect the factory pressure gauge to be off by approx 10 PSI. I'm going to hook up a known-accurate gauge to check. Here are some pump timings:
The pressure switch does include an unloader, which is a nice touch if you're into the sensual whoosh of a valve purging.
Cold fill from 0 PSI to 90 PSI (according to factory gauge): 02:45
Cold fill from 0 PSI to 170 PSI (according to factory gauge): 05:17
Fill from 130 PSI to 170 PSI (according to the factory gauge): 01:05
I'll probably never need anything near 15cfm, but who knows.
It's plenty for my 1/2" impact and plasma
In summary, the compressor is probably good enough as a commodity grade unit, however, I probably could have picked up a home depot special with the same level quality and not waited a month for it to arrive.
- Assembled in USA. I am pretty sure the parts are globally sourced
- Unit does not take up a lot of room
- Easy to work on and replace broken parts. Don't ask me why I know.
- More than enough power for what I need to use it for
- Much noise and vibration
- Fit and finish is lame
- Leaks from factory
The folks at aircompressorsdirect.com were great and I would buy from them again for the customer service alone. I'll update on the regulator and inline drying setup I use once I get the drain valve fixed.