Compressor

Junkman · Feb 7, 2005

Decided to go to the garage and look..... mine is a pressure lubricated unit with an oil filter, rather than the splash lubed ones that they are now making. I believe that even Quincy has entered the field of cheaper air compressors to be able to compete for the lucrative homeowner market. I will post two pictures..... this is a side view....

Junkman · Feb 7, 2005

In this picture, you can see the optional copper lines that I have added so the compressor will go to an idle, without the compressor spinning, but the motor continues to run. When the pressure drops to a certain point, then the compressor will then start pumping. This is a modification that you can order from the factory, or add yourself. Mine didn't have it when it arrived, so I added it. Great when you are using a lot of air. The thing to look for with the Quincy compressors is the pressure lubrication if you want them to last.

ZJ_HR · Feb 8, 2005

Junkman,
All compressors possible to find here are splash lubricated.
I never see something like this here. Pump looks very robust.
How many CFM @ rpm it has, psi, gal, HP, single or double stage... Motol looks like single phase

I'm very curious man /forums/images/graemlins/wink.gif /forums/images/graemlins/smile.gif

rswyan · Feb 8, 2005

( Will it be enough? )

ZJ,

I have a compressor very similar to the one you are looking at getting. Mine is a single-stage Coleman BlackMax, 5 HP, around a 30 gallon tank, probably around 120 psi max. Splash lube, horizontal tank.

I've had it for over 10 years. I don't use it daily, sometimes not even weekly - but I have used it intensively at different points in time. I run a variety of air tools, including a siphon sandblaster (which will make it run continously if you have very much to blast)

Mine has held up very well - the only thing I've done with it is change the oil regularly.

EastTexFrank · Feb 8, 2005

Thanks guys. I thought it was something along those lines but I didn't know ... now I do.

Soundguy · Feb 8, 2005

At TSC you can get a farm hand.. or a CH compressor .. 60 gal.. 5hp upright in the 400$ range. Harbor freight sometimes has IR units but generally has their brand CP.. also in the 400$ range.

We have one of the tsc/CH brands at work, married to a 60 gal tank from a compressor we had that lost it's pump.

It runs big 1" air ratchets.. spray paint.. our plasma cutter.. etc.

Soundguy

ELMO67 · Feb 8, 2005

Wow! That looks huge- is it really a 5hp, or a 25 hp as illustrated in the 1st picture?

Rch · Feb 8, 2005

Compressor 101

The above is a great basic discussion on air compressors

Junkman · Feb 8, 2005

Mine is a true 5 HP electric motor..... not one that is about 2 HP, but some engineer has some fancy way of figuring out how to call it a 5 HP by doing some fancy footwork. I looked up the motor number once to get a price for the motor for another compressor that I was considering. It was like mine, but had two compressor heads mounted with 2 3 phase motors. I figured that I would just replace the motors and then sell mine. The motor alone, with the best discount that I could find was just a hair over $400 buying 2 of them. I gave up on the though of buying that compressor since the motor cost put it out of practical range. It was the only one like it that I had ever seen and it was a factory built unit. I doubt that you could have run that unit out of air no matter how hard you tried. The way it worked, is that one motor / compressor would come on and if that one didn't bring the tank up to specifications soon enough, then the other one would kick on and give it assistance. Would have been great for doing sand blasting...

sneaky_pete · Feb 8, 2005

Thanks RCH, that link (the rest of the site looks great too) went straight to my "favorites" file.

Soundguy · Feb 9, 2005

( Mine is a true 5 HP electric motor..... not one that is about 2 HP, but some engineer has some fancy way of figuring out how to call it a 5 HP by doing some fancy footwork )

Not fancy footwork.. just depends on how it was rated... could be listed as peak HP?

This is a common situation in many industries. Take audio amplifiers. You generally want to see the watt rating in rms ( root mean square (for the non-electronic types ).. but you still see peak watt ratings used in many applications.. and those just are not realized outputs Sine wave measurement really muddies the watter with differences between average, rms, peak, and peak to peak readings.. not to mention specialized test equipmet.. like peak reading vom's .

Same holds true with most small engine manufacturers. I can run down to tsc and buy a 3500$ lawnmower that advertises the same engine HP as my ford 8n is rated for. No offense.. but a huskie lawnmower doesn't crank out the 'same' 26 HP and my 8n does. Torque has alot to do with it and rpm rating. Reading the specs for what is done when testing engine hp claims is like watching sausage being made. In many cases, the max hp rating of an engine is taken bare bones, and at an rpm that is pretty much just about to make the engine self detonate.. situations you'll never see when mowing the grass...

I chalk it up to too much advertising influence over the engineering process.

Soundguy

have_blue · Feb 9, 2005

CH got the pants sued off them and now rate at "Running HP" in addition to "Peak HP". This makes a huge difference in lighter duty high RPM compressor HP rating.

ELMO67 · Feb 9, 2005

" and at an rpm that is pretty much just about to make the engine self detonate.. situations you'll never see when mowing the grass"...You haven't seen me mow my lawn /forums/images/graemlins/grin.gif.

Soundguy · Feb 9, 2005

That's good. We had an old compressor with a 5 hp motor.. and theis new one has the 5hp peak motor.. big difference in motor size.

Soundguy

Soundguy · Feb 9, 2005

( You haven't seen me mow my lawn .
)

/forums/images/graemlins/laugh.gif /forums/images/graemlins/cool.gif /forums/images/graemlins/grin.gif

Good one!

Soundgu

ZJ_HR · Mar 14, 2005

Here are some news:
Today I bought compressor, industrial grade, made 1978.
It has 4kW(5.5HP), 3phase, 400Volts motor. Pump is 3cyl, single stage, splash lubricated, run at 1200rpm. Tank is 87 liter (25gal).
It increases from 6-9bar for 35 seconds.
So, calculated flow is 450 liter/min - 16cfm, max pressure is 10bar (145psi).

It's not a Quincy, but is pretty heavy built /forums/images/graemlins/grin.gif /forums/images/graemlins/grin.gif /forums/images/graemlins/grin.gif

Need some work on it, to make up it, but it works pretty good for 250$, what I paid for it /forums/images/graemlins/cool.gif