Reply to "double water pumps."

A few years ago, while revisiting my Pantera's cooling system, I decided to consult with Stewart and Meziere, to see what they suggested. The people I spoke with at both firms were familiar with the Pantera and both had the same concerns and suggestions. They both felt the biggest problem with the Pantera's cooling system (once you replaced the OEM fans) was cavitation at mid to high RPM's, due to resistance to coolant flow. They went on to say that the largest contributor to this resistance was simply the length of the coolant lines due to the distance between the water pump and the radiator.

Both Stewart and Meziere had the same recommendations: remove as much restriction to flow as possible and install an electric "booster" water pump as close to the radiator's outlet as possible. The guy at Stewart told me they usually recommend two pass radiators but in the case of the Pantera, they'd go with a single pass rad, in order to reduce resistance to coolant flow and the chances of cavitation. I mentioned the remote thermostat mod. that some Pantera owners have had success with and both people liked the idea.

I did ultimately buy an electric "booster" water pump. I went with the Stewart as it presents zero restriction to coolant flow when it's turned off. The other thing I found interesting was that both company's representitives steered me away from using an electric water pump as the primary pump on a car that's mainly street driven.