Super EVO Water Pump with Large Impeller
Fitted with a PPS, glass filled plastic impeller as used by Aston Martin and Jaguar it reduces weight on the bearing loading and has a triple lip seal giving a better controlled flow rate through the rev range.The pump is about 130 grams lighter and has the rolled edge gasket facing evolved for better sealing. Tested with coolant pumping at 10,000 rpm with no detriment to the PPS impeller this larger impeller pump moved more coolant than the original early standard pump.
The GWP134EVO has the by-pass hose take off. These water pumps have a much larger impeller, it sticks into the block very slightly more than 1/2"(14.03mm).
This water pump will fit all 1275cc blocks and all small bore blocks, with the exception of early 850/997cc units. These early blocks will need an amount of modification, relieving corrosion and slight material from the liner wall and impeller if required should enable clearance, try spinning pump loosely fitted without gasket for clearance. The high capacity water pump helps to reduce cavitation in the water jacket, particularly at high RPM, as well as circulating a greater volume of coolant. Further reduction of cavitation is achieved by using a large diameter water pump pulleys. When using a large diameter pulleyit is necessary to check clearance between the large pulley and the head, if a lot of material has been machined from the head face as it may foul the pulley function.
- Morris Minor 1000