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Tool Talk Discussion Forum

Compressor Comparisons

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Just Wondering

11-30-2006 09:15:52




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Would like opinions for comparing two air compressors. One delivers 9.7 scfm @ 90 psi, with a 135 psi max and 60 gal. tank (motor listed as "7 HP peak"). The other delivers 10.2 scfm @ 90 psi, with a 150 psi max and 60 gal. tank (motor listed at "3.2 HP running"). Both are single-stage.

Will the 150 psi compressor allow more tool use before the motor kicks in? This would be for home shop use, nothing heavy duty, but with occassional continuous air use in sander or small sand blaster setup.

Right now the budget can't afford a huge pro model, and I don't think the usage would justify it either. But on the other hand, I don't really want to get something that won't be any better than the 25 gal. 2 HP model that I'm running to death right now.

Any thoughts on the better setup?

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135 Fan

11-30-2006 17:16:52




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 Re: Compressor Comparisons in reply to Just Wondering, 11-30-2006 09:15:52  
Try to get a 1725 rpm motor and a oil lube cast iron pump. Don't go by motor HP. A true 7 HP compressor would probably put out over 40 CFM. The two units you mentioned are really close. A lot of air tools aren't recommended for over 125 psi max. Some are only 90 psi. A bigger tank is better because you have some reserve. Dave



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jeffcat

11-30-2006 16:24:29




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 Re: Compressor Comparisons in reply to Just Wondering, 11-30-2006 09:15:52  
I have told people this many times on this site, and it is stil true. Cast iron pump if possible. LIFE TIME of ues. Biggest tank you can afford. This gives you more run time on your tools. IF the pump goes {chug chug chug} and NOT WHHHHAAAAA A; then that is a good compresssor. Go to your local car shop or repair center and look at what they have. When the pump starts up it goes chug-chug. There is a VERY good reason. They last and they PUMP. Not bustin your tail but a REAL machine will work SOOO much better. I have a couple of Emglo compressors and they will run for HOURS and still keep right on pumpin with no sweat. Let us know if you need any more advice. Jeffcat

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Charles (in GA)

11-30-2006 14:26:36




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 Re: Compressor Comparisons in reply to Just Wondering, 11-30-2006 09:15:52  
So far, Old is the only one with the right answer, your question has nothing to do with the compressor or the motor, nothing.

It simply has to do with a 60 gal tank and how much pressure it has in it. More pressure means more molecules of air have been jammed into the same space, thus more stored energy in the higher pressure tank (assuming you regulate both of them down to about 90 psi) and a longer run time till the pump kicks in ..... .... assuming both pumps kick in AT THE SAME PRESSURE, which may or may not be true.

Charles

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JMS/MN

11-30-2006 14:05:34




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 Re: Compressor Comparisons in reply to Just Wondering, 11-30-2006 09:15:52  
What Rustyfarmall says about hp marketing strategy is true. Look at the motor plate to see amperage draw. Using W=V times Amps....do the math and divide calculated watts by 745 to get true hp. I bought a labeled 6hp last year that comes out to only 4.4 true hp. Ok as long as you know ahead of time what you're buying.



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Rustyfarmall

11-30-2006 11:29:12




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 Re: Compressor Comparisons in reply to Just Wondering, 11-30-2006 09:15:52  
The deciding factor is the scfm. Go with the most scfm you can afford. Everything else such as 7 horsepower or 3.2 horsepower is nothing more than a marketing scheme geared towards the un-informed, it means nothing. If you intend to use the compressor for sand blasting or other powered tools with extended run times, even the 10.2 scfm will not be enough. You should be able to find a unit with around 15 scfm and still not break the bank. My compressor is rated at 11.5 scfm, it will keep up with a siphon type sand blaster, but it will never shut off.

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old

11-30-2006 09:21:28




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 Re: Compressor Comparisons in reply to Just Wondering, 11-30-2006 09:15:52  
Higher preassure means more time before the motor kicks back in but longer run time to get back up to full tank. Its a catch 22 either way you go. I do my self prefer the higher preassure type because it will do more work with things like impact guns etc.



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