I just completed getting my 1953 Tecumseh 2 cyl in line compressor running and in service.

It fill a 60 gallon tank.
I timed how long it took it to get to the following pressures with no air being used--just filling the tank.
20 PSI in 40 seconds
40 Psi in 1: 40 ( one minute, 40 seconds)
60 PSI in 2:40
80 PSI in 3:50
100 PSI in 5:10
110 PSI in 6:00

Can anyone show me how to calculate the free air delivery, or the delivery at 40 PSI and,say 90 PSI?

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1982 300SD " Wotan" ..On the road as of Jan 8, 2007 with Historic Tags