Quincy a-4 ROC 16 cfm question

[Buddro]

I am looking at buying a Dayton air compressor with a Quincy pump on it. I want to use it for spray painting and need around 10 cfm at 20psi. The pump has a tag with the model number a-4 16 size 2 1/2 X 2 1/2. It currently has a 3/4 horse dayton motor on it. The tank is dated 1953 but at a glance I am not sure the tank, pump and motor are all original to one another.

My questions are what kind of output would you guys expect out of this pump given good condition?

What kind of output do you guys actually get out of yours if you own one, with what size motor?

Is there a relationship between the a-4 pumps and the 300 series pumps? It seems the a-4 may be a specific model within the 300s or something to that tune. Given I know little about compressors I am having trouble building the knowledge base to compare this model to others.

Any links to general antique Quincy reference pages where I could educate myself would be appreciated as well.

Thanks

 

[redmondjp]

Internet-search: "Quincy 216 air compressor" and download the brochure from a number of available links.

It sounds like you have a Quincy 216 pump - the "-4" is likely the Record Of Change or ROC as it is commonly-known. This is basically the design revision level and can be used to date the unit.

The 2-series are single-stage, while the 3-series are two-stage pumps.

If you do have a 216, here is a relevant thread from this site:

Quincy Compressor Pump Info?

I recently acquired a Quincy 216 compressor pump, and would like to know if there are any online locations where docs available for these older Quincy pumps? I'd like to know what the CFM capability of this pump is, and just in case I need to rebuild it one day, I'd like to maybe find a...

www.garagejournal.com

 

[strutaeng]

A-4? I bought an older model that was an A-4 a long time ago. If it's the same one I had (I think mine had a 3/4 HP motor also,) then I doubt you will get 10 CFM out of it. I remember it was rated like 2.8 CFM or something like that. Mine was from the early 80s IIRC. For a while I spun it faster and made more CFM, but eventually I cut the 30 gallon tank and made it into a smoker. I "think" I still have the pump behind my shed.

What are you spraying? 10CFM is going to require a 240V compressor, even at 20 psi, I'm pretty sure.

 

[Buddro]

How do you get 216 out of A-4? I am not questioning your understanding, I am trying to understand the nameology of these systems for the future. Do you know of any cross reference type pages where I can figure this stuff for myself? I searched bud didnt find much

2-3 cfm is about what I seemed to find as well based on the manufacture and piston size/stroke without knowing it was a 216. Well under what I need. The guy is asking 100 dollars for the system. I am pretty tempted to get it for basic use just because a compressor from the 50s is way cooler than my aweful modern coleman compressor. Was your compressor quietish when it ran?

I bought a Devilbliss FLG-5 spray gun that will be my highest consumption tool for now. I believe its advertised at 9.8 cfm @ 20 psi, don't quote me though. 240v with a much nicer compressor is in the works but it will be a few years before I can allocate the money to run a circuit to my shop. Until then I plan to keep my projects small. I may potentially tie two compressors together running off of separate circuits via a manifold with some check valves and such when I need more air.

Thanks for the responses!

 

[Buddro]

I will rephrase... does "A" signify anything? Or did you assume from the size it was single stage and thusly 2xx series?

 

[Buddro]

Alright, trying to Identify this is driving me a bit crazy. Does anyone recognize this pump? The tag says quincy at the bottom but the pump looks more to me like some I am finding from Kellog. Did Quincy ever manufacture pumps for Kellog machines?

 

[Buddro]

Im just not finding images of Quincy pumps with cylindrical heads and louvres (or what ever the fins would be called in this instance) arranged horizontally rather than verticle.

 

[mogandave]

Why not try it with a gun full of water and see if it keeps up.

 

[Buddro]

I haven't bought the compressor yet. I am going to the town the compressor is for sale in on saturday and trying to learn as much as I can before I decide if I need to spend the money on it.

If I do buy it I will likely do just that.

 

[mogandave]

I haven't bought the compressor yet. I am going to the town the compressor is for sale in on saturday and trying to learn as much as I can before I decide if I need to spend the money on it.

If I do buy it I will likely do just that.

How much is it? Take your gun with you and try it.

Getting 10 CFM out or 3/4 HP might be tough

If it has not sold by Saturday, it's probably not worth it.

 

[metlmunchr]

The A4 compressors we're used on a lot of pneumatic temperature control systems for the HVAC systems in commercial buildings. These control systems always used high quality compressor pumps because nothing works if the compressed air supply dies.

That said, you'd be fortunate to get 3 cfm from that unit. They run slow so the volumetric efficiency is good, but 4 cfm per HP is the upper limit for reciprocating compressors, and 3 to 3.5 cfm per HP is much more common.

I've got a couple of the FLG-5 guns, and IMO they offer the best performance per dollar of any gun on the market. But, it takes a minimum 3hp compressor to provide adequate air. No need to waste your time trying to use it with anything less. In reality, that gun needs 28-30 psi at the gun (measured with the trigger pulled) for best performance.

 

[Buddro]

I imagine it won't do 10 cfm, but I want to have an idea of what it will do. As well as whether or not the 3/4 horse motor is appropriate to this pump. Also I would like to know what it is from a collector stand point. If the pump its self is pre war I am likely to buy it regardless of
utility.

If I am being honest its become something of a puzzle, I enjoy researching old tools and this compressor seems to be interesting. It doesn't follow what I have found for "regular" Quincy model scheme. Is there some reason for that that will make me smile a bit more owning it?

As far as the test drive, also a good idea, but my gun is being shipped from Europe so I wont have it to try out for a while. The compressor is a few states over in a town I will just happen to be in for the weekend so I can't wait till the gun comes in to go try it. I will ask the owner to fire the compressor up and see how long it takes to come up to pressure and make a guess about output from that. Still, knowing what this pump is and what it is "supposed" to be able to do will help me to understand the condition of the pump if something is off.

 

[Buddro]

Thanks met, knowing the a4 were designed for a specific use helps me understand this unit. In the only other reference I found to this pump the guy was getting low volume, but being only a single unit with no further information, I wasn't sure if his compressor was running to spec or not. Sounds like it was.

 

[mogandave]

If you want something that looks cool that you can air tires with, it might be a good choice.

If you want to paint or run a grinder, probably not.

You know the bore and stroke, you can calculate rotations it takes to compress a cubic foot, and from there you can figure out how fast it needs to run for the CFM you want.

It’s not likely it’s rated for a significantly bigger motor.

 

[yatg]

Im just not finding images of Quincy pumps with cylindrical heads and louvres (or what ever the fins would be called in this instance) arranged horizontally rather than verticle.

Its a 1972-ish pump
parts manual attached (date released 1972-07-31)

My guess is that its such an old and odd pump, there may not be a lot of parts available for it unless they cross-ref with other pumps.

Rough calc of displaced CFM
pi x r*r x stroke = cubic inches per cycle
3.14159 * 1.25 * 1.25 * 2.5 = 12.27ci
@ 600 rpm, 12.27 * 600 = 7632ci / 1728 = 4.42cfm
delivered cfm at pressure will be lower

An A4 that sold at auction

Used Construction, Agricultural Equip., Trucks, Trailers & more

Used equipment for sale: Online auctions of heavy equipment for construction, farm, fleet, transportation, government and other industries.

www.purplewave.com

 

[strutaeng]

I forgot I created this thread a long time ago, LOL.

Quincy QR-25 Model A4

Aficionados, I need some suggestions. I bought this air compressor some time ago and finally got it running. It had a 3 phase motor and I put a 120V motor that I had from another tool. It is from 1983. The tank is 30 gal. The thing is that it puts out 1.3 CFM, which is barely enough for nail...

www.garagejournal.com

It IS a sweet little pump. It has a low "chug-chug" sound. Nothing like the high-pitched high RPM NOISE of the newer compressors. It's built like a tank. Pump probably weights a good 50 lbs?

I should probably put mine back in service. I'm currently running a Husky diaphragm twin hot dog for light duty use in the garage. But those things are so chintzy and disposable. I doubt it will last even with my light usage.

 

[Buddro]

I appreciate the input. Knowing the head is from the 70s and not the 50s like the tank makes a difference to me. I have seen a few generic brand gasket kits but I already suspected major parts would be an issue.

I appreciate the link, I had found 1 or 2 write ups early in my research but kind of forgot about them. Last night I went back and re-read them. I think yours was one. Helpful information its good to hear it is quiet.

 

[DenCap]

Alright, trying to Identify this is driving me a bit crazy. Does anyone recognize this pump? The tag says quincy at the bottom but the pump looks more to me like some I am finding from Kellog. Did Quincy ever manufacture pumps for Kellog machines?

 

[DenCap]

I have a similar Quincy A-4 ROC 14. Everything I researched said this is a Quincy with a GE 3/4 motor made in 1950.