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Old 06-10-2003, 11:55 PM
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Compressor shopping..

guys check out this compressor...http://www.harborfreight.com/cpi/cta...emnumber=46168
I think it should be enough to paint car...esp having V style which should last me longer. what I dont understand is that CFM should be more at higher pressure right? cause its cubic feet per minite and so as it has more psi, it should have more cfm but it shows at higher PSI it has less cfm? how's so? well anyways let me know what do you think of this ohe guys, I might not keep but just for one paint job and then return it.

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Old 06-11-2003, 06:57 AM
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I personally do not like direct drive compressors. The specs on that compressor (if believable) are certainly enough to run a spray gun, if you can stand the noise.

Vince
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Old 06-11-2003, 09:56 AM
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That compressor is too small. It will run constantly and add alot of heat to the air. I would suggest at least a 5HP if yo uare going oiless direct drive. I have a 5HP with 30 gallon tank, and it will barely keep up with a spray gun, and I mean barely.

Chris
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Old 06-11-2003, 10:38 AM
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You will be much happier with a 5HP Harbor Freight compressor. They can be had for about $350 on sale. As mentioned above, the direct drive small units are strictly hobby grade. Won't last very long for shop work.

The volume goes down as pressure goes up due to air being a compressible gas. A piston compressing air to 10 psi will move a lot more gas than one compressing it to 100psi. The former uses a lot of the stroke to move the air thru the valves while the latter uses the majority of the stroke to compress the air to pressure then a small part of the stroke to shove it thru the valve.
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Old 06-11-2003, 05:18 PM
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Mitmaks, the higher the pressure the lower the CFM. This is due to the standard rating of a compressor. In painting, you are interested in a constant volume at a regulated pressure. For air tools, it is the same. So if you demand more volume to paint or operate tools at a set pressure that is above the compressors capability, then the pressure will continue to drop, trying to deliver the set volume. Thus a larger compressor could provide 18 CFM at 175 PSI and 30 CFM at 90 PSI. Now you are talking about two stage compressor and 6+HP motor and near $2000.

Trees
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Old 06-15-2003, 10:13 PM
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I would suggest a 5 horse 60 gallon tank it want have to wark as hard and have less water and 60 gallon tank will give you more air reserve so you can have consistent ail pressure
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