Does the engine RPM affect pump performance?
Changing the engine RPM changes the performance characteristics of the total pump package. Generally, increasing engine speed will increase the pump’s flow capacity. However, the higher the engine speed is increased, the smaller the gain in performance becomes. In addition, increasing the engine speed increases engine fuel consumption, reduces continuous operating time and reduces overall engine life, all of which increase operating cost. Many manufacturers quote high pump performance characteristics at high engine RPM to make their specifications appear better. Thompson Pump rates its pumps only at 1,800 and 2,000 RPM.
