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85 hp is pretty good at less than 2000 rpms with a 6 cyl gasser,, (if thats what you have) Really,, the 560 and the 806 pto speeds are very different,, where the 560 at 540 may run 1900 engine rpm, make 85 hp, but you go put that same engine in a 806 chassis, that same engine would be alot more powerful, probably close to 110 hp,,, 806's run 2640 engine speed, at 540 pto rpm. Follow what Im saying here??? The PTO speed difference in the two tractors is why the HP is not where it is,,, Id belive it would be 100 hp solid if you could test it at the 806 rpm. I know factors are so much different under running conditions,,, but I took your Known factors,, and did something like this,,,,, A 560, 85hp at 540 pto speed,,, that about 1900 engine rpm,,,
I take 85HP divided by the rpm, then multiply that figure by the new rpm,,,, in this case, at 806 specs,, it MIGHT be 118hp at 2640 engine rpm. The only factor thats different between the 560 and the 806 is the rated engine speed at 540,, the 560 is 1900 or less, and the 806 is 2640+. So,, it looks like this,,,, 85 hp, divided by 1900 = .044736842 then, multiply that by any rpm you want to try,,, so lets go with 3000 rpm,,,, .044736842 X 3000 = 134.21 hp at 3000 rpm. If you know the engine speed at 540, and the known HP at 540,, you can try that figure, and have a close idea on what it might be at a higher rpm. Chad
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