If my rpm speed is too high will that cause my motor to over heat on a 2 stage

I built a 80 gallon compressor using a new 2 stage 29 cfm pump.

I used a brand new Baldor 7.5 hp 1ph 3450 rpm motor.

The pump has a 16.8 in flywheel.

I put a 6.75 in pulley on the motor, on the assumption that I would need 1400rpm on the pump.

My motor labors hard at the upper end just before shuting off at 120lbs .

I researched and found that many compressors require around 800 rpm to the pump.

My question that I am looking for, will the higher rpm cause the motor to over work? Or is there something that I might be over looking?

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Bill says....

Sounds like you need an engineer... however, here goes.

Your electric motor has a fixed RPM. You adjust the speed of the driven component by the use of various sized sheaves, one on the motor shaft, and one on the pump or driven component.

In some cases, the motor sheave drives another sheave that, in turn, drives another as the speed of the pump necessitates the RPM increase or decrease.

Re this... "new 2 stage 29 cfm pump" what were the specs of the pump in terms of the HP necessary to drive it? Surely they would have provided that info?

Re this... "I put a 6.75 in pulley on the motor, on the assumption that I would need 1400rpm on the pump." On what basis did you make this assumption... the manual, I hope?

This... "My motor labors hard at the upper end just before shuting off at 120lbs . " could be that the sheaves are the wrong size to allow the motor to drive the pump at the correct RPM, or it could be that the check valve going into the tank is causing a problem.

I am happy to post this in the hope that an engineering or electric motor re-builder can provide more info for you.

Cheers,

Bill