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you can go piss up a rope
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Discussion Starter #1 (Edited)
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.

PRO's:
- 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

CON's:
- 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.
 

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Registered
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Looks good, I like the vertical layout for space savings. The claimed 15 CFM numbers look legit with your measured times and pressures for a 60 gallon tank. Only concern is you said it was drawing 28amps, by chance is that a typo because that’s a good bit over motor data plate of 21A and pretty close to its LRA code H (~29A). If actually measured though that could account for the noisey operation, although I’m sure even a correctly functioning unit is far from quiet just being an air compressor in general.
 

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you can go piss up a rope
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1,230 Posts
Discussion Starter #3
I tested it with a clamp style meter and pretty sure the reading was 29, but I'll check again. Also I need to shim and lag the feet to the floor. It's not perfectly level as is due to the slope of the garage floor. Quincy does not recommend using iso pads, so I need to find some kind of rigid shim.
 

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Random Dude
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3,041 Posts
I tested it with a clamp style meter and pretty sure the reading was 29, but I'll check again. Also I need to shim and lag the feet to the floor. It's not perfectly level as is due to the slope of the garage floor. Quincy does not recommend using iso pads, so I need to find some kind of rigid shim.
How much do you have to shim your low spots :cwm13: ?


  • Couple of heavy fender washers?
  • Block of steel, aluminum, delrin, UHMW, solid phenolic?
















Or . . . for mad 'froading cred., maybe some of these?:



:thefinger:
 

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Gunnery Sergeant USMC (ret)
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22,098 Posts
Why not build an enclosure outside the garage and sound proof it?
 

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you can go piss up a rope
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1,230 Posts
Discussion Starter #7 (Edited)
So, on closer examination, one of the feet is slightly bent which is contributing to the leveling issue. I was going to go with ExWrench's pucks, instead I went with almond for milder, less-smoky flavor.

Couple that with the drain valve leak, my guess is this thing was handled rough during shipping. Where I live, Quincy seems to use FedEx freight for outgoing shipments. Based on my experience at work, I would never use FedEX freight because they manhandle everything. XPO and Champagne are my go-to freight companies.

Once I figured out that a 93dB air compressor drowns out my neighbor's jungle music, I learned to embrace the noise. I'm spoiled with having 90psi non-stop. I never realized how much time I spent waiting for a tank to refill.
 

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Gunnery Sergeant USMC (ret)
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22,098 Posts
Moving soon. I'm banned from starting any new projects :)
Why didn't you just wait to buy compressor after the move?
 

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you can go piss up a rope
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1,230 Posts
Discussion Starter #10

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Super Moderator
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6,175 Posts
Instant gratification syndrome.
Same reason I'm always compulsively masturbating to pictures of fat midgets.

So, if I read that correctly, we can surmise that you :
yank-off to fat midgets, impulsively order big,heavy, 'spensive, long, erect, wrapped units which arrive via mail and that you hold sailor balls to a gold standard ... :rainbow2:


this is news?
:thefinger:



 

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you can go piss up a rope
Joined
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1,230 Posts
Discussion Starter #14
So, if I read that correctly, we can surmise that you :
yank-off to fat midgets, impulsively order big,heavy, 'spensive, long, erect, wrapped units which arrive via mail and that you hold sailor balls to a gold standard ... :rainbow2:


this is news?
:thefinger:
You're going to get caught wheeling with me and then the rumors are really going to fly.
 

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Mall Crawler Extraordinaire
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97 Posts
Do they not recommend any isolation whatsoever or just nothing softish? I have a rather large collection of industrial anti vibration blocks salvaged from medical equipment after shipping. My intention was to use them as bump stop extensions on the cheap. Then I got the idea to offer them to others so I kept gathering them up. I of course never got around to actually doing what I intended.

They look exactly like these: Anti Vibration Rubber Mount Vibration Isolator Manufacturers and Suppliers China - Customized Products Price - SVKS Seal

If you think you can use some of these to quiet down/level your new toy let me know how many you want. Free to your door.
 

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you can go piss up a rope
Joined
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1,230 Posts
Discussion Starter #18
Do they not recommend any isolation whatsoever or just nothing softish? I have a rather large collection of industrial anti vibration blocks salvaged from medical equipment after shipping. My intention was to use them as bump stop extensions on the cheap. Then I got the idea to offer them to others so I kept gathering them up. I of course never got around to actually doing what I intended.

They look exactly like these: Anti Vibration Rubber Mount Vibration Isolator Manufacturers and Suppliers China - Customized Products Price - SVKS Seal

If you think you can use some of these to quiet down/level your new toy let me know how many you want. Free to your door.
I have some, but avoiding using them. If you ever run across some cobalt-60 just laying around the warehouse, I know a guy...
 
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