Dirtman wrote:1.8 cfm @ 90 psi delivers more volume.
cfm (cubic feet per minute) is the volume of the flow, regardless of the pressure. 1.8 cfm is a larger volume of flow than 1.7 cfm.
tks. I should have phrased that differently. I was wondering which compressor delivers more volume @ 100psi. The one which is rated 1.8 cfm @90psi or the one rated 1.7 @100psi. If it helps, one compressor delivers 2.6 cfm @ 40psi and 1.7 cfm @ 100psi, the other one delivers 2.7 cfm @ 40psi and 1.8 cfm @ 90psi. The first one loses the ability to deliver .9 cfm over the rise in pressure from 40 - 90 psi, the other one loses the ability to lose .9 cfm over the pressure change from 40 - 100 psi. So I'm wondering how much volume the one which has a rating for 90psi delivers at 100 psi.