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No problem just wondered what the cfm is witha 5 hp 1725 rpm motor.

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General rule of thumb is 3.75 cfm per hp.

Posted on Dec 19, 2013

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SOURCE: More RPM Issues for Tools 1)

I had the same problem a while back, But I didn't bother with exact speed, what I cared more about was power and speed, and not bogging down. And I had it running smooth. Of course I have no idea what the pulley diameters were, but it sounds like you should be real close with the 2 1/2 inch at the head and 5 1/2 inch at the motor spinning 1725, should be about 900? So to get 700, bring the 5 1/2 down to 4 1/2, see if it has enough speed/power.

Posted on Feb 13, 2010

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