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Old 03-26-2002, 02:23 PM   #1
COBALT
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Post Air Compressors AGAIN! Real experiences please!

Ok, I know this has been discussed, and rehashed, and debated about 1000 times, but now its my turn to ask for help on this.

I've been doing some research on what I'll need for an air compressor for the truck restoration. I'll be doing all of the grinding, sanding, and cutting, and MAYBE some painting, but if I need anything sandblasted I'll want to have a professional do it. I might want to sandblast small stuff (like cross-members), but no major stuff...

...so I'm drifting toward a 5-7 hp, 60-80 gallon, 2 stage oil-lubed compressor that can put out 10-12 CFM at 90psi. More power the better. I don't want to get 1/2 way into a job and run out of air when I really need it. That puts me in the $800-$1000 range.

Here's the problem. We're doing this at my dad's place, where nothing like this has ever been done before. He's always operated with these smaller portable 2-2.5 hp oilless units that are good for blowing dirt/grass off the tractor, painting the barns, and inflating tires. He's thinking about getting a new one RIGHT NOW, but he's still looking in that same small range convinced that it will handle everything I need to do to my truck. Right now he's looking at one of these dual tank 3 hp compressors that's rated for nail guns. On top of that his breaker box at his shop is full, and he doesn't have any 220v outlets wired! I'm trying to convince him to split the cost on a big one...

So, who has used some of these smaller 110-115v 2-3hp compressors (which can only throw out 3-4 CFM at 90 psi at most-maybe as high as 6) and managed to get good results for what I'm talking about doing? Is it totally out of the question to use a small one, or am I right in thinking big? HELP before this whole restoration comes to a screaching halt before it starts!

------------------
'69 3/4 ton C20 2wd w/ 350ci/400THM and a wood bed!
'69 3/4 ton Custom 20 2wd w/ ORIGINAL 350ci/4sp Manual and a wood bed (parts beast).
Seattle, WA.

*See pics of my trucks and project at www.webshots.com!


[This message has been edited by new69owner (edited March 26, 2002).]
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Old 03-26-2002, 02:42 PM   #2
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I had the small one. Running a orbital sander or grinder, would totally kill it in about 2 min. I sold it and bought a 60 gal upright rated at 9cfm@90psi. Best thing I ever bought, I sanded the entire truck and never ran out of air. If you are doin all the work yourself, the small one will just frustrate the HELL out of you.
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Old 03-26-2002, 02:52 PM   #3
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I would agree . . . nothing more frustrating than waiting for air to build up . . . plus you'll shorten the life of the unit by running it that hard. Go for the bigger compressor and wire a 220 breaker - if your panel is full, you can buy a small panel to add on to the one you have . . . jump from your main lugs to the new panel & you're set - just make sure you kill the power to the panel before you start . . . 220 bites Lee

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Old 03-26-2002, 02:57 PM   #4
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http://www.sears.com/sr/product/summ...id=00916731000

That is what I have and I am totally happy with it. Sanding, grinding, Cut-off wheel, works great.
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Old 03-26-2002, 03:07 PM   #5
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nosurf: I saw this one. What concerned me was the fact that it was oilless and the CFMs at 90 were a bit low. Oh, and also it was damn loud!

Do you do any painting? I've had 3 body shop guys tell me they wouldn't touch it if it was rated below 11 CFM at 90 psi. What size grinders and sanders to you use? How many RPM? I'm not worried about wrenches, but die cutters, grinders, sanders and chizels worry me (in terms of CFM @ psi).

------------------
'69 3/4 ton C20 2wd w/ 350ci/400THM and a wood bed!
'69 3/4 ton Custom 20 2wd w/ ORIGINAL 350ci/4sp Manual and a wood bed (parts beast).
Seattle, WA.

*See pics of my trucks and project at www.webshots.com!
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Old 03-26-2002, 03:09 PM   #6
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im running a big red air machine at 160psi. i dunno what cfm its rated at but its an 80 gallon with 5hp i believe.never had a problem with anything but it was 900 bucks if im rememberin correctly got it from snap on


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Old 03-26-2002, 03:16 PM   #7
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Here's the two that I'm looking at:
This is the single stage: http://www.bright.net/~mcain/pic10.html
This is the two stage: http://www.bright.net/~mcain/pic11.html
This is the company home page: http://www.bright.net/~mcain/
This company is in Ohio so I can pick mine up and save myself the Shipping.

BTW....They have some really good info on their site.....what to look for in a good compressor.

Maybe if I show this post to them they will give me a discount



[This message has been edited by 1972c10_ohio (edited March 26, 2002).]
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Old 03-26-2002, 03:24 PM   #8
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The most important thing to look for in a compressor is the OPERATING CFM. The tank can be 80+ gallons, but if the compressor is not big enough to replenish the air in the tank while it is being used then it is just like a small tank and comressor. Look for a compressor that has 12 or higher as the operating CFM. Most air tools can empty a 11 and below CFM with 60+ gallon tank in minutes.
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[This message has been edited by 67Fleetsidedream (edited March 26, 2002).]
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Old 03-26-2002, 04:31 PM   #9
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Don't let a big tank fool ya. If the compressor is not rated more than the air tools you are using then you might as well hook the tool to the compressor without a tank. And most tools are rated at 90 psi[some newer ones I have seen are rated at 85] Sometimes people have problems running out of air because they don't use a regulator. A die grinder is rated at 4 cfm at 90 psi but if you run it at a 120 psi you better have a real big commpressor. The main thing is save your money and buy best quality/biggest you can afford. I personally would not even look at an oiless if for no other reason because they are so loud.

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Old 03-26-2002, 07:22 PM   #10
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Here is the info that I got from the company that I listed in my earlier post.....
Quote:
Just look at the CFM on your air tool--they are giving you an average CFM but not a constant CFM rating. Look at the constant CFM rating --it is about 3 times higher than an average CFM. Also, watch out for companies offering CFM displacement only. The CFM displacement is bore times stroke times pump RPM @ 0 PSI. This will tell you nothing of what your compressor will put out. You want to know what the free air delivery is at pressure. As you go up in pressure, you loose pump efficiency. For example, the unit you should go with is 21.50 CFM displacement and has a free air of 17 CFM @ 175 PSI and a FREE AIR of 19 @ 40 PSI. So don't buy CFM displacement.

[This message has been edited by 1972c10_ohio (edited March 26, 2002).]
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Old 03-27-2002, 01:46 PM   #11
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The compressor that we have used for the last three years is a made in USA Curtis, 5 hp, 2 stage, 220 volt unit. The model no. is 5EIHT6 and it is rated at 15.81 CFM running at 1100 rpm, and producing 90 psi.

It has a 60 gallon receiver. Pump up time from 0 psi to 175 psi is 7 minutes and 46 seconds.

It will run everything that we have except
extended sand blasting and it does not have the horsepower for that. We change the oil in the crankcase on a regular basis and have had no problems with it. We run the compressor 20-25 hours per week. We built a room for the compressor outside of the pole barn to keep the noise out because compressors are noisy.

Prior to getting this compressor we had a 6 hp Sears and it would not do half of what this compressor will do.

Jim
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Old 03-27-2002, 01:52 PM   #12
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if you are going to be doing painting you will need at least 14 cfm any less and you will starve your spray gun. air tools will normally run on 10 -12cfm I am looking for a compressor to so don't cfheap out or you'll regret it.
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Old 03-27-2002, 02:10 PM   #13
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I have a Black Max 80 gallon,2 stage,11 cfm from Sam's Club. I got it on sale for $750.00. Before that i had a Sears "oilless" compressor. DO NOT buy one of these. Bad move. Way more annoying noise than the Black Max. And was the biggest peice of crap compressor i ever had.
Go to Sam's Club and check them out. 5 years i have had this compressor and not 1 problem.
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Old 03-27-2002, 02:28 PM   #14
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I got a Quincy 5hp two stage with a 60 gal tank from Harbor Freight. Free shipping, no sales tax and made in Illinois. Beautiful !
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Old 03-27-2002, 02:42 PM   #15
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I do alot of work with Campbell Hausefeld. I got a 2 stage 80gal 7.5HP upright. It catches up and waits on everything like sandblasting, grinding, etc. One thing to keep in mind is hidden costs like the wiring, regulators and plumbing. It's been a workhorse with no problems for about 7 years now.

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Old 03-27-2002, 03:26 PM   #16
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Well, I've checked on some of the brands people have mentioned, but some of them either aren't being sold any more or not available.

I did check up on some compressors at harbor freight, but a lot of them are single stage. Bottom line is I'm thinking correctly. The price range is going to be in the $800-$1000 range. There are simply no 2-stage compressors in any other range besides UP!

I'm thinking either:

1. Ingersoll-Rand
2. Campbell-Hausfeld
3. Porter Cable

I checked with the local distributor for Ingersoll-Rand. They can get me a 5hp 2stage Compressor (60 gal. capacity) that puts out 14.9 CFM at 90psi, and 14.7 CFM @ max (175psi). They're quoting me $1050. Its driving distance to my dad's place.

I think this is the one I'm going to persue.

------------------
'69 3/4 ton C20 2wd w/ 350ci/400THM and a wood bed!
'69 3/4 ton Custom 20 2wd w/ ORIGINAL 350ci/4sp Manual and a wood bed (parts beast).
Seattle, WA.

*See pics of my trucks and project at www.webshots.com!
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Old 03-27-2002, 03:33 PM   #17
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Sounds like an awsome deal, and it will be plenty to do anything you want.

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Old 03-27-2002, 05:27 PM   #18
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what is there an air compressor company in Quincy, Bernie ?
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Old 03-27-2002, 05:30 PM   #19
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http://www.quincycompressor.com/
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Old 03-27-2002, 05:46 PM   #20
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Yeah, Quincy and
http://www.championpneumatic.com

where the two that 1972c10_ohio had suggested to me via email.

Quincy quoted me about $300 higher than the compressor 1972c10_ohio is thinking about buying from the private fabricator, or
http://air.ingersoll-rand.com

which is local and has a walk-in show room.

Champion never got back to me. I think I've "looked" enough! hehe




------------------
'69 3/4 ton C20 2wd w/ 350ci/400THM and a wood bed!
'69 3/4 ton Custom 20 2wd w/ ORIGINAL 350ci/4sp Manual and a wood bed (parts beast).
Seattle, WA.

*See pics of my trucks and project at www.webshots.com!



[This message has been edited by new69owner (edited March 27, 2002).]
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Old 03-28-2002, 02:03 AM   #21
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i just bought a new craftsmen 80 gallon compressor, its rated at 16.4 cfm at 90 psi, it is great, i sandblaset my bed and never ran out of air. I paid a little over 800 for it at sears.

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Old 03-28-2002, 08:37 AM   #22
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I've got a Campbell-Hausfeld. I wouldn't buy another one. I sure like those Ingersol units though. At work we've used those Devilbis units that Costco sells. They run all day every day for like two years before they start to use any oil and even then they still work great. For a DIY guy they would go a lifetime.
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Old 03-28-2002, 01:35 PM   #23
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that compressor you mentioned sounds like a good compressor you shouldn't have a problem doing anything with that one
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