I am making a dyno to measure go-kart engine torque for a high-school 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) pump.
It would be great if you could provide ideas where I could find a cheap pump. For example, could I find one at an auto wrecker? What car manufacturers would use a PD pump? Thanks for any input.