I am looking at different engines and wanted to know is there a formula for finding out how much PSI I would be putting out with knowing the motor size and the gear drive GPM pump.....anyone know?
I was responding to russ's post everything I wrote came across.
Any engine, regardless of HP, that will turn a pump at the specified RPM will produce the specified GPM & PSI output.
Pump output is based on RPM not HP. HP is needed only to achieve the desired RPM with a certain amount of efficiency.
This is simple logic folks, not rocket science. The pumps have already been engineered to produce a given PSI and GPM flow at a specific RPM.
Altering the RPM will change the GPM & PSI output. Find the pump specs and attach a motor that will turn it at the specified RPM and you're done.