Re: Optical Tachometer:Different Pulley Diameters-

Posted by NC Wayne on June 18, 2005 at 18:23:02 from (205.188.117.66):

In Reply to: Optical Tachometer:Different Pulley Diameters-QUES posted by Andrew H on June 18, 2005 at 16:57:12:

Your right, a reading off of any of the pulleys but the one connected to the crank is gonna give you a false reading. If a larger pulley is driving a smaller pulley the smaller one is gonna be turning at a greater speed (overdriven)than the driving pulley, and the reverse happens if the driven pulley is larger because it will turn slower. If you can get a fairely accurate measurement of both the driving and driven pulleys then you ought to be able to figure out the speed. In the example you gave the crank should be turning 20% slower than the water pump pulley or 464 RPM. Hope this helps and good luck.

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