Air Compressor Motor Upgrade Question

Things to consider. What is the RPM of the current motor? What is the shaft size of the current motor? What is the rpm of the new motor? What is the shaft size of the new motor?
If they are the same rpm and shaft size, just install the original pulley onto the new motor and be done with it. If one or both mismatch, then you will need to do some figuring. If the rpm's are the same, but shaft size is different, a new pulley can be bought. But if the rpm's are different, then a pulley change can be made to take up the difference, to a point.
It depends on what the rpm is. If the new motor is slower, and larger pulley can be bought, but a larger pulley can make the motor work harder and be slower/harder to start. If the new motor is faster, a smaller pulley can be bought, but I don't think I have seen smaller than a 2 inch pulley.
Here is a good site to do some testing. Measure your compressor pulley, and motor pulley. Enter them in and enter the motors rpm. This will then tell you what rpm the compressor is spinning. You can use that data and then change the rpm to the new motors rpm and then change the pulley size till it matches what it was before.
http://www.blocklayer.com/pulley-belteng.aspx

Like stated above, as long as you don't exceed the max rpm of the compressor, it does not matter how may HP the motor is.Things to consider. What is the RPM of the current motor? What is the shaft size of the current motor? What is the rpm of the new motor? What is the shaft size of the new motor?If they are the same rpm and shaft size, just install the original pulley onto the new motor and be done with it. If one or both mismatch, then you will need to do some figuring. If the rpm's are the same, but shaft size is different, a new pulley can be bought. But if the rpm's are different, then a pulley change can be made to take up the difference, to a point.It depends on what the rpm is. If the new motor is slower, and larger pulley can be bought, but a larger pulley can make the motor work harder and be slower/harder to start. If the new motor is faster, a smaller pulley can be bought, but I don't think I have seen smaller than a 2 inch pulley.Here is a good site to do some testing. Measure your compressor pulley, and motor pulley. Enter them in and enter the motors rpm. This will then tell you what rpm the compressor is spinning. You can use that data and then change the rpm to the new motors rpm and then change the pulley size till it matches what it was before.