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Old 09-27-2019, 06:13 AM
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Test your air compressor cfm

https://www.airgastech.com/resources/calculators.html


My 5hp Saylor-Beall 17cfm 0 to 175 time comes in at just about 10 seconds short. Not bad since it's from the early 70's.

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Old 09-27-2019, 08:01 AM
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Some years ago my compressor was running lots and I called the company. Woman said I should not be having the problem, gave me the times from 1-120 and 60-120. She then asked me if I have changed the filter...me: "what filter?". She sent me a couple of free filters, changed it and everything was fine. Painted several cars and the filter was so clogged I don't know why it could get ANY air.
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Old 09-29-2019, 05:58 AM
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My new Quincy builds pretty quick, 0-175 psi, but I'll check it to see. Cool calculator...
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Old 09-29-2019, 07:07 AM
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My calculation is a little of since it's listed at 17.3cfm and it only takes whole numbers, but when I timed it I also had the valve to the line and hose open so I guess that added some "tank" volume. Not much though.


Curious, I never normally let the pressure go down to zero, but dang it sure knocks until it gets up to over 15-20psi. The manufacture told me that it's the check valve in the tank? Sounds like a rod knock but gets quiet, at 25psi I can't hear it anymore. Please let me know if yours does similar. I don't think my little sears 1hp does that?
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Old 09-29-2019, 08:08 AM
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Mine is pretty quiet for the most part considering the type of compressor and motor. It makes the same noise when it starts whether the tank is full or empty, and the pitch of the pump doesn't change regardless....but no knocking noise at all...ever....yet..........
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