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Tool Talk Discussion Forum

Air Compressor CFM Question??

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Art

11-01-2003 06:40:44




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Looking to buy a new air compressor for the garage, to run on 110 current.Looking at about 5 horse and at least 20 gallon.My question is: is the CFM produced at 40 lbs more important than cfm produced at 90 lbs? Some compressors go from like 7.1 at 40 to 4.7cfm at 90 lbs.Isnt 4.7 kinda low? Biggest air hog that will be ran is air impact occasionally.




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fixerupper

11-01-2003 20:28:44




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 Re: Air Compressor CFM Question?? in reply to Art, 11-01-2003 06:40:44  
One thing many people forget to look at when using an air wrench is air flow to the wrench. Air tools like a lot of air flow and if the air line is restricted by a shut off valve that has a little dinky hole through it or a hose that has an inside diameter that is too small, you will need more pressure to get enough flow to make it work right. A 3/8'' I.D. airline will give you adequate flow and the shut off valve on the compressor needs to have at least a 5/16'' hole in it. This should give you enough air at 90 psi. to make your wrench work right. A 20 gallon tank will let you get the wheel bolts off of one wheel on an average car if the compressor is pumped up fully to begin with. Get the biggest compressor that will run on the wiring you have in your garage. And yes,forget the advertised horsepower it can be VERY deceptive. Go by the motor amperage and the CFM,s.

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Robert in W. Mi

11-01-2003 08:13:42




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 Re: Air Compressor CFM Question?? in reply to Art, 11-01-2003 06:40:44  
It takes close to 10 amps at 110V to make "one" hp, so don't believe any of the advertised hp claims!! Look at the name plate on the motor and see how many amps. it draws!!

"If" you want a 5hp then you will need to go 220V, as on 110V it would be pulling close to 50 amps!! And, that's not going to happen!

Robert



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rustyfarmall

11-01-2003 07:11:38




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 Re: Air Compressor CFM Question?? in reply to Art, 11-01-2003 06:40:44  
Take a good look at the air tool you are going to be using, the label will tell you the CFM required, and most air tools also require a regulated 90 psi minimum. In other words, your air impact may require 4.7 cfm at 90 psi. You need an air compressor which will supply at least that much.



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Gene SC

11-01-2003 15:47:48




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 Re: Re: Air Compressor CFM Question?? in reply to rustyfarmall, 11-01-2003 07:11:38  
I'm a Contractor, and i use an "AirMate"by
Emglow. DeWalt also has a good one. 4.7 cfm use it about 100 lbs. will run an air gun all day it'll usually catch up while you reload. I also
use it in my shop connected to a 20 gal tank. have lines run from tank to outlets throughout
shop. set comp. outside (less noise). The 4.7
will do about anything you need. I sometimes even
run a paint sprayer with mine. sometimes you have to let it "catch up" Have had mine for about 7 years with NO problems Good Luck

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