The delta is in conversion efficiency of the gas engine. There's "HP', and then there is "brake horsepower". The brake HP of an engine is the work product, with all of the internal loads, and lags taken into account.
A 25HP engine will typically produce between 12-16 brake HP. Diesel might be a bit better with no intake vacuum.
For the motor, I would try a 16HP 1750RPM and see how that works. Without knowing more about the engine, it's kinda hard to be precise.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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