What if the OP is looking for more HP for a PTO application?
His implement is too big for the tractor/engine? or he's going too fast for the implement to keep from bogging down the engine? Power comes from Torque ... HP yields speed by maintaining torque further along the rpm curve until the two are equal at max HP. Any more rpm after that & torque drops off. Also, if the hp is for PTO only, he risks the gearbox/the tranny/the driveshafts(s)/axles as well as engine bearings/crankshaft, valves, pistons if his build isn't done right. Assuming he is getting 540 rpm at the pto @ 2200 engine rpm, what will the extra 750-1000 engine rpm get him @ the pto besides broken parts & worn clutches? If the implement is stalling his tractor he needs a smaller implement or he needs to run it slower. I love power/speed/& hot rodding for all things driven by an engine. At the same time, I will always gauge the application & the results of failure. If he's got another reliable tractor to do work & this is his "toy" ... hell drop an old p-pump cummins 4 or 6 BTA into the thing, manufacture/find the tranny adaptors (or replace with the dodge 5 speed manual), put in a new hydraulic pump set-up, redesign the hood, mounts & frame to support the weight & cover the beast & go break stuff with the 105-600 HP he can produce with relatively little effort. It ain't going to be reliable, fuel efficient, or cheap, but it will be LOTS of fun until he has to tow it back to the barn. Depending on weight distribution & traction, a roll cage probably would be a good safety addition. I've come close to winning a Darwin award on numerous occasions & spent WAY too much money adding power to things that weren't designed to handle it, & in all likelihood I will again before I die. It's one thing to throw a rod or blow your tranny when you're halfway down a 1/4 mile strip of asphalt, different calculation if you're 100 miles offshore in a boat or if you ain't feeding the family this month because you had "a great idea" to soup up the old girl cheap. Anything CAN be done, but it ain't always the smart or "best" thing to do. If he needs more power to run the 18 ft batwing field mower on a regular basis, a bigger tractor is probably cheaper & more reliable than anything I might do, if he needs to skid some big trees that he can't pull now, he's probably better cutting the logs in half or off renting something for the day that will. If it's a matter of the 6 ft bush hog bogs down the tractor at 6 mph, try downshifting & run at 3 mph while maintaining the pto rpm or run a 4 footer instead. Lots of answers, but OP still hasn't responded with why he wants the power, nor has he offered an indication of the budget to achieve said extra power.
