Modifying a 360 water pump

I don't know why I cant post any pictures, but think about this
if you run the belt over the crank pulley, and the water pump pulley, they both turn in the same direction

now, if you place an idler pulley above and slightly to the right of the water pump pulley, you can run one side of the belt of the water pump pulley and now it runs the opposite way

(I had made a great drawing, colours and all, but it didn't link for some reason)