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Re: Optical Tachometer:Different Pulley Diameters-
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Posted by Jerry/MT on June 20, 2005 at 16:31:41 from (206.183.120.247):
In Reply to: Optical Tachometer:Different Pulley Diameters-QUES posted by Andrew H on June 18, 2005 at 16:57:12:
If your rpm is 580 at the water pump pulley and the water pump pulley has a 20 % smaller diameter than the crank shaft then D water pump/ Dcrankshaft = 0.8. Your crankshaft speed is 580/0.8 =725 rpm. The equation is N1 x D1 = N2 x D2 = a constant. So knowing one rpm and the diameter of the respective pulleys, or the diameter ratio of the pullies, you can calculate the other desired rpm
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