I am making a dyno to measure gokart engine torque for a highschool project. I would like to use a water brake by varying input/output through a water pump and have read that this should be a positive displacement (not centrifugal). It would be great if you could provide ideas where I could find a cheap pump. For example, could I find a suitable pump at an auto wrecker? What car manufacturers would use a PD pump? Thanks for any input.
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