I am trying to design a small engine dyno using a water pump. The problem I have getting started is pump selection. The motor I will be testing is a 50 to 60 hp maximum and 10,000 rpm maximum. My first thought is to reduce the driven speed of the pump by possibly 10:1. How do I determine the gpm and maximum pressure pump required to adequately load this engine. My plan is to increase the engine load by slowly closing a valve to increase the pump pressure. I believe that by comparing the output pressure to the rpm and torque measured off the free to rotate pump housing. The torque data would be collected using a load cell attached to the pump housing.
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