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Jim's shroud looks to space the face of the fan about 0.5-0.75" away from the face of the radiator. In this case, there is 0.5-0.75" of a gap where the fan will suck air from instead of through the radiator fins if the second fan is removed or unplugged. If there is ANY gap between the outer edges of the fan housing and the face of the radiator fins, then it will greatly affect the cooling ability of the fan.For a SPAL fan, you want to mount the face directly to the fins, or have an air tight seal from the outer edges of the fan to the face of the shield. On another note, for the end tanks, I think you drew the diagram wrong for the top/bottom end tank design. I believe all production cars have the hot water go IN the TOP then the cooled water comes OUT of the BOTTOM. Could you elaborate on how the cross flow radiator cools better than the top-down?
Jim's shroud looks to space the face of the fan about 0.5-0.75" away from the face of the radiator. In this case, there is 0.5-0.75" of a gap where the fan will suck air from instead of through the radiator fins if the second fan is removed or unplugged. If there is ANY gap between the outer edges of the fan housing and the face of the radiator fins, then it will greatly affect the cooling ability of the fan.
For a SPAL fan, you want to mount the face directly to the fins, or have an air tight seal from the outer edges of the fan to the face of the shield.
On another note, for the end tanks, I think you drew the diagram wrong for the top/bottom end tank design. I believe all production cars have the hot water go IN the TOP then the cooled water comes OUT of the BOTTOM. Could you elaborate on how the cross flow radiator cools better than the top-down?
