Reply to "Aluminum Water Pump Issue"

The open face side of the stock water pump impeller, however, allows the pumped engine coolant to `spill` over the open back of the blade during operation through the open spaces between each of the impeller blades, spoiling the ability of each blade to fully trap and pump all the water that is in front of it. This spillage also creates cavitation, decreasing pumping efficiency and requiring that more power be used to rotate the pump than would be required if the cavitation was not present. The addition of the anticavitation disk to the stock impeller eliminates the cavitation caused by coolant spilling out the open face of the stock impeller by blocking off the open spaces between the blades.