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Just Collect Pumping fluid in a barrel and count the time.Then measure how much liters or Gallons of fluid collected in barrel with in one minute.You will get ltrs/min or GPM
just couple the pump and connect the prime mover to a pulse counter (which will give you singe pulse per rotation ) put the delievery (output) into the scaled jar ,run the pump for a while and devide the quantity by the number of rotations (after subtracting the quantity of oil in the delievery line )
so it the method to get the displacement of a pump.
