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Posted by gmharris [71.105.36.40] on Thursday, October 27, 2011 at 22:52:04 :
In Reply to: cfm/psi?? gmharris? posted by Jerry in Idaho [69.59.83.175] on Thursday, October 27, 2011 at 19:37:48 :
When I bought my 5hp compressor, I had the choice of two models: One had a 125 PSI max and the other 175 PSI max.
The 175 PSI machine has a smaller pump displacement allowing the 5 HP motor to reach the higher cutoff setting. The 125 PSI pump has more displacement so it can pump more air, but at lower air pressures. The machines were otherwise identical.
I got the 175 PSI machine because it was on a closeout special. I think most people wanted the higher volume of the 125 PSI model and the high pressure machine was not selling well.
I find I almost never need 175 PSI, but I could occasionally use more air volume.
If you want to spend enough money you can get the best of both worlds: high pressure and high volume. But, at the 5HP non-commercial level you're probably going to have to compromise.