It takes more than 6 to 8 HP to run a 72 inch rotary mower. I hate to be the bearer of bad news but I think you'd be spending a bunch of money on something that you'll be very disappointed with. You'll never be able to lift the deck up. The back wheels would be 3 feet in the air. How are going to sharpen or change blades? Where will you mount the extra capacity hydraulic tank and oil cooler? Getting a fast enough motor is only one part of the design. You need to have a high enough horsepower and torque motor as well. If you had all 16 HP of the engine available for the deck would still be low in all but very short grass. Like I said, go to a commercial mower dealer and check on some specs. of mowers that are already made. They are designed by experienced engineers. They can have some problems but usually the HP and oil flow are figured out correctly. Dave
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