Water pump pulley
Rat Bastid I see you disagree. There are plenty of articles that support what I said. Here is one from Hot Rod. There is also a section in mopar performance manual.
Marlan DavisWriter, Photographer
Jul 15, 2020
Engine Coolant Flow Rate In The Motor Should Have Enough Time To Fully Circulate And Absorb Heat, And In The Radiator For Efficient Heat Transfer Without Getting Into Laminar Flow
Faster is not better when it comes to engine coolant flow rate. The purpose of a radiator is to support heat transfer, which is a time-dependent process. As Flex-a-Lite explains, to move the heat from one medium to another (engine to coolant to radiator to atmosphere), the coolant has to remain in contact with a surface for heat transfer to take place. Moving fluid too quickly through an area can result in laminar flow, where the fluid forms layers. The layer closest to the surface moves slower than layers farther away from the surface. When this occurs, the layers act as insulators and the capacity to transfer heat is diminished.
A low RPM cruiser will benefit with a high flow rate pump. A high RPM performance car where the RPM's are consistently higher will not. Manufactures who sell overdrive pulleys and High flow rate pumps will never tell you that. It would diminish sales of their product.
Why do you think mopar had two different flow rate pumps in the 70's. A 340 took a different pump then a 318. Or a car with AC and without
Dig out your old Direct Connection manual and read. They also recommend a washer with a 1 inch hole . I ran 1 inch hoses on my car. The 1 inch NPT threads came right in the Moroso stat housing connector. Wonder Why????
Rat Bastid I see you disagree. There are plenty of articles that support what I said. Here is one from Hot Rod. There is also a section in mopar performance manual.
Marlan DavisWriter, Photographer
Jul 15, 2020
Engine Coolant Flow Rate In The Motor Should Have Enough Time To Fully Circulate And Absorb Heat, And In The Radiator For Efficient Heat Transfer Without Getting Into Laminar Flow
Faster is not better when it comes to engine coolant flow rate. The purpose of a radiator is to support heat transfer, which is a time-dependent process. As Flex-a-Lite explains, to move the heat from one medium to another (engine to coolant to radiator to atmosphere), the coolant has to remain in contact with a surface for heat transfer to take place. Moving fluid too quickly through an area can result in laminar flow, where the fluid forms layers. The layer closest to the surface moves slower than layers farther away from the surface. When this occurs, the layers act as insulators and the capacity to transfer heat is diminished.
A low RPM cruiser will benefit with a high flow rate pump. A high RPM performance car where the RPM's are consistently higher will not. Manufactures who sell overdrive pulleys and High flow rate pumps will never tell you that. It would diminish sales of their product.
Why do you think mopar had two different flow rate pumps in the 70's. A 340 took a different pump then a 318. Or a car with AC and without
Dig out your old Direct Connection manual and read. They also recommend a washer with a 1 inch hole . I ran 1 inch hoses on my car. The 1 inch NPT threads came right in the Moroso stat housing connector. Wonder Why????
