No...

Posted by FM on August 06, 2004 at 20:41:37 from (64.186.198.161):

In Reply to: Pulley Sizes=?Speed posted by Scooby on August 06, 2004 at 19:10:10:

That will more than quadruple your speed. The formula I have is RPM of Driver over(or divided by) RPM of Driven Equals(=) Diameter of driven over Diameter of driver.

Using the RPM of 750 for the driver, your rear pulley would turn at ~428.5 RPMs. With your suggested change, it'll turn at 1714 RPMs.

If you are wanting to double your speed compared to your current set up, you can keep the same size driver and replace the driven with your 3.5" sheave. That'll get ya pretty close(~857 RPM using the 750 input RPM above).

Mike

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