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Answer:
you want a pulley with a 3/4" shaft.
You want the pump to run at about 1700 rpm so you will have to adjust you size accordingly. A lot of gasoline engines have a 3" pulley and the water pump is a 6" pulley. Formula circumference = Diameter X Pie 3.14 = x
3 X 3.14 = 9.42"
6 X 3.14 = 18.84"
Using 9.42 over 18.84 = X over 3400
Cross multiply
So when the engine is turning 3400 RPM the pump runs 1700 rpm
you want a pulley with a 3/4" shaft.
You want the pump to run at about 1700 rpm so you will have to adjust you size accordingly. A lot of gasoline engines have a 3" pulley and the water pump is a 6" pulley. Formula circumference = Diameter X Pie 3.14 = x
3 X 3.14 = 9.42"
6 X 3.14 = 18.84"
Using 9.42 over 18.84 = X over 3400
Cross multiply
So when the engine is turning 3400 RPM the pump runs 1700 rpm
