The 8N had R1 tires and the Bobcat had R4's. The 8N had calcium in the tires. The Bobcat had either methanol or magnesium, every time I asked at the dealer what fluid they put in the tires I got a different answer. If you look at a 8N the front axle is in front of the engine, so a lot of the weight is on the rear. If you get a 8N on a somewhat hard pull the front will lift. The Bobcat had the loader on it, I don't know if this helped or hurt it, never tried it without. With the diff locked and in 4wd the Bobcat had 3 tires pulling versus the 8N having 1 tire pulling. I was on the Bobcat and I could start dragging the 8N backwards and he could let out on the clutch and easily pull the Bobcat. The front was barely lifting on the 8N. I saw an antique tractor pull on RFD TV. They weighed each tractor. It was a contest to see who could pull the most percentage of their weight. I think a 8N pulled 75% and a Allis Chalmer won with 135%. Using both tractors for 3PH work the Bobcat seemed more powerful though. Maybe it was just because it was a hydro and I could contol my ground speed better than the 8N. Whenever you did anything with the 8N you spun quite a bit, but maybe it was doing better than I thought:confused3: I looked up the Nebraska test for the 8N, it would pull a max of 2810lbs, the tractor was ballasted to a weight of 4043lbs.