For safty's sake, I hope you all check this website to see what the potential is for a compressor tank to explode:
https://sites.google.com/site/metropolitanforensics/cause-of-explosion-of-air-compressor-tanks
Found It!!! (...a small miracle) Here is what the Tech Specialist at Ingersoll-Rand provided me for that Model B pump. I think my recollection of "(up) to 1100 rpm" was in error.
Ingersoll-Rand Model B Compressor Pump Characteristics
0.75 HP 80 psi 2 CFM 575 RPM
1.00 HP 150 psi 2 CFM...
I have a Model B and use it regularly. Mine is an old gasoline service station pump from the 1950's. It is a low volume compressor, about 2 cfm. I run mine at 900 rpm and it takes roughly 20 minutes to fill an 60 gallon (oversized) tank to 125psi. That is plenty of air for me. I contacted IR...