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Tool Talk Discussion Forum

Air compressor questions...

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Jay87T

02-25-2005 04:59:27




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Hey guys first time posting here love the forum, my question is about air compressors. 1st question is how important is HP? what exactly does HP mean anyways when they all turn a pully is it the ammount of rpm it puts out? Im going to look at a 60 gallon Gilber & Barker older upright compressor, has a big pump on it but it only has a 220, 1hp motor on it. would adding a bigger motor put out more cfm? because its turns faster?
Thanks.

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Roger P.

02-25-2005 18:10:19




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 Re: Air compressor questions... in reply to Jay87T, 02-25-2005 04:59:27  
I can guarantee that that compressor is a re-badged unit from another manufacturer. If you could shoot me a pic I might be able to identify it for you. Kellogg used to make a model 321 which was pretty big for its rating (1.5hp).



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Jay87T

02-26-2005 10:10:11




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 Re: Air compressor questions... in reply to Roger P., 02-25-2005 18:10:19  
Hey!! you are right I just checked the web and found this. >Link
that>Link looks exactly like it! any Idea what the output of these are? cfm wise? and what the speeds they should run at are?
Thanks.



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Roger P.

02-26-2005 13:23:34




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 Re: Air compressor questions... in reply to Jay87T, 02-26-2005 10:10:11  
1.5hp = approximately 6 cfm. I think that this is a bit small of a compressor for a 60 gallon tank, but it might have been a light duty unit. These are good machines. Parts should still be around. Depending on the amp draw of the motor at cut-out, you might be able to lower the cutout pressure and put a slightly bigger motor pulley on it to get a bit more air, but I'd be tempted just to put on a smaller tank. That one is probably close to the end of its life anyway at that age.

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Jay87T

02-26-2005 10:00:59




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 Re: Air compressor questions... in reply to Roger P., 02-25-2005 18:10:19  
I will sure do that Im going over to the guys house tomororw to take the pump off the compressor, I will take a pic, I saw the motor was a 1.5hp motor and spins at about 1700rpm. the pump is very big and has a little round glass on the side for looking at the oil



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bill b va

02-25-2005 14:20:50




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 Re: Air compressor questions... in reply to Jay87T, 02-25-2005 04:59:27  

the size of the tank means very little . except to take up space . if the compressor has the pumping capacity it will stay ahead of tool needs .



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thejdman01

02-25-2005 12:32:09




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 Re: Air compressor questions... in reply to Jay87T, 02-25-2005 04:59:27  
you dont want to start speeding up your compressor by changing pullies. yes it will run faster and will put out more cfm but the life will greatly be reduced



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Jay8T

02-25-2005 14:44:09




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 Re: Air compressor questions... in reply to thejdman01, 02-25-2005 12:32:09  
what speeds in rpm do these old 1951 monstor compressors run at? when he started this thing up it didnt seem like it turned very fast.



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thejdman01

02-25-2005 16:38:31




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 Re: Air compressor questions... in reply to Jay8T, 02-25-2005 14:44:09  
yes you can swap out pullies and make it run faster. faster will = more cfm. i cannot give you an answer as to speed w/o knowing a model number etc. there should be a tag on the comjprssor with model speed cfm manufacture and manufacture date. the only thing a bigger motor would be good for is if you set the pressure higher, swapped out pullies to make it run faster, or if your unloader isnt working (the unloader relieves pressure in the motor so it starts up easier. starting a comprssor or a electric motor in general takes 3 times as much energy and 3 times as much power to get it started up vs running at full speed. also a higher horse motor would help it start if it isnt in a heated shop. when oil gets cold on those old compressors it takes alot of power to get them running. alot of time what i see more then the mtoor being undersized is the wiring isnt heavy enough. also make sure you drain those old beasts. old cast iron tanks get alot of condensation in them esp if your using it cycling on and off turning on and off tank pressures building and bleeding off. i knew a guy once had a big 60 gal tank said pos cant keep up with my air tools worn out junk constantly turning on and off and the guy went out bought a brand new compressor and told me i oculd have the "piece of junk". well i went to drain the tank to transport it home i opened the drain water started coming out and no joke the tank probably had 50 gallons of water in it. the compressor wasnt the problem. the outlet for the tools was ontop of the tank so he didnt get alot of water in his tools but had to be getting some. moral of the story is jkeep your tanks drained at least once a month

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RustyFarmall

02-25-2005 07:16:52




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 Re: Air compressor questions... in reply to Jay87T, 02-25-2005 04:59:27  
Horsepower means nothing, what you need to be concerned with is the capacity of the compressor in cubic feet per minute, CFM. If the unit you are looking at has the CFM required to power the tools you will be using it with then that is just about all you need to know. The air tool you might be using will be marked with the required cfm to run it, such as 11.4cfm @ 90psi.



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Jay87T

02-25-2005 07:33:29




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 Re: Air compressor questions... in reply to RustyFarmall, 02-25-2005 07:16:52  
would there be anyway to make the compressor stronger to sandblast? ie faster running motor? or is it all in the compressor pump, in theory cant you speed up the pump to pump more air?



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Coloken

02-25-2005 06:47:00




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 Re: Air compressor questions... in reply to Jay87T, 02-25-2005 04:59:27  
The amount of air it puts out depends on the size of the piston and the rpm of the pump. The HP REQUIRED depend on this (the cu ft.) and the pressure developed. If the motor is big enough, putting a larger one on, will change nothing--un less you speed up the compressor with diferent pullies. Or want to up the pressure. A larger motor with a larger pulley would give more Cu/in per min. Don't get confussed with your "for real" 1 HP motor and the lied about HP ratings on the import compressors in the stores.

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FarmerDave

02-25-2005 06:11:25




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 Re: Air compressor questions... in reply to Jay87T, 02-25-2005 04:59:27  
HP does not mean anything. There was a class action lawsuit against the builders and they have started toning down their ratings. If you remember there are about 750 watts in a HP and you calculate the number of watts you can draw on a 20 a line ( 20 * 120 ), you will quickly know that 7 HP just isn't so.

20A * 120v / 750w is 3.2 HP max theoretictal.

Chances are you're old 220 model will do about all you need except sandblast.

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Co;oken

02-25-2005 06:32:20




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 Re: Air compressor questions... in reply to FarmerDave, 02-25-2005 06:11:25  
Never heard about the law suit, but sure glad. This is one of the things that has realy bugged me. Look in the store and air compressors are painted with signs like, 5 HP and 7 1/2 Hp and they are 110 volt jobs. My guess is about a true 1/2 HP. I have a 1 1/2 HP with a regular type motor hooked up as 110 volt. I have to have it on a circuit with 30 amp breakers. Big argument with friend who has a "5 HP" that he plugges into any old wall plug in. Talk about lieing. I did get used to the audio amps "sound power" rateing. A peak power/average power thing. Like my computer speakers being 20 watt, (but transformer that runs them is a 5 watt). But electric motors..no way.

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Rod in Smiths Falls, ON,

02-25-2005 14:26:43




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 Re: Air compressor questions... in reply to Co;oken, 02-25-2005 06:32:20  

KMS Tools in B.C. has a no-nonesense buying guide on their website. It explains the horsepower questions quite ably. Seems the newer compressors get past the start-up impedence by automatically draining the pressure down to where the motor can start easily.

It's a good site.

http://www.kmstools.com/main.php?scripts/products/cat.php?3



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