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Posted by JohnD [71.255.216.165] on Saturday, October 29, 2011 at 09:29:46 :
In Reply to: cfm/psi?? gmharris? posted by Jerry in Idaho [69.59.83.175] on Thursday, October 27, 2011 at 19:37:48 :
If you think of the compressor as an engine, the CFM is the diameter and stroke of the piston(s) times the rpm's of the compressor.
The pressure is the result of cramming more and more air into a tank. Eventually, the motor will stall, or the compression (fit between piston rings and cyllinder walls) will reach it's maximum and the compressor wil just flat out refuse to put out additional pressure.
The tank is only a storage vessel. It would allow you to use - say an impact wrench for a few seconds, even though the compressor (pump) is not big enough to run the wrench directly.
The only way to increase CFM is to get a pump with bigger pistons, or to speed up the rpm's of the one you have now. Speeding it up will increase the air flow, but will cause your motor to work much harder as it builds pressure, probably exceeding it's horsepower capacity.