Motor pulley sizing is crucial but often misunderstood. This article explains the math behind it and provides a helpful thread on the topic! .
For air compressors and all applications that use motors, as a matter of fact, it is critical that pulleys are sized correctly to ensure that the correct RPMs (revolutions per minute) are. .
The formulas for determining pulley ratios are complex, but in generic, more layman-like terms, you can simply divide the pump’s RPM by the motor’s RPM to get the required pulley ratio. .
This was a long thread that started when Zain sent in a request for help with the size and RPM required for an older air compressor. His initial post was in early October 2019 and he asked: “Please help me identify this compressor pump. I am interested to know what size and RPM motor I need for it as well as recommended oil and capacity.. [pdf]
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