SR20 WATER PUMP PULLYships directly from Japan Please allow 2 4 weeks for delivery It is a necessity to suppress the rise in water temperature of the SR20DET engine. The reason for making the pulley bigger is to lower the speed of the pump than normal and reduce the foam. The bubble is actually the big enemy of raising the water temperature. At 7000 revolutions, if you keep the water temperature rise to 6000 revolutions, the water temperature will stop rising. It's a