I decided to use a Pierburg CWA100-3 for the intercooler. Pierburg is the same manufacturer that I plan on using for the main cooling system. They were the world's first series-production supplier of an electric coolant pump so they've been doing it longer than anyone. The pumps are manufactured in Germany and are OEM equipment for BMW and others. They have a brushless motor and an integrated variable speed controller which can be controlled via a PWM signal. I’m not sure what other pumps spin at, but I was surprised to see this one is rated at 7,000 RPM. As can be seen in the graph below 30-35 l/min @ 0.75 bar.
Like many electric fluid pumps the inlet and outlet are 90-degrees apart. It makes sense to vertically orient the pump so that inlet is gravity fed by the reservoir and the outlet points towards the tube in the side pod. The top is clock-able in one of four directions once the four T20 Torx screws are removed. As can be seen in the picture below the top is sealed with an O-ring. I clocked the top so that the electrical connector was oriented towards the chassis.
The pump has a rubber sleeve for vibration isolation. The sleeve has a full-height ~0.06” x 0.73” bump on the OD so the mounting bracket requires a notch. I’m sure that there are OEM brackets out there, but a 3D-printed bracket makes sense in this situation; I’m no where near a heat source, it will be lighter than an aluminum one and I can place the notch exactly where I want it to orient the pump. Once I get the pump mounted to the chassis I may need to tweak the location of the notch.
