Remember, today's tractors are also turning more hydraulic pumps for the powershift, bigger pumps for the hydraulics, with more parasitic losses at the motor end for AC and the alternator due to higher electrical loads. The new MX Magnums are actually comparable to the 89 series Magnums they replaced, but you can't really compare the drivetrain power losses in them to the older tractors because of the powershift vs gear transmissions, and the hydraulic capacities and such.
I have no idea what the flywheel power on something like an SM or 1066 would be. Did they even bother to advertise that back in the day?
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Today's Featured Article - On the Road with Dave Gohl: Tractor Club Beginnings - by Dave Gohl. I was surprised about a month ago when I got a call from a fellow tractor croonie. His message was interesting and to the point. He's says "Dave, I've been thinking about starting a Two Cylinder club for our area. What do ya think?" It was a loaded question. I said that I would be interested, and was wondering what his next step was. (Although I was talking under my breath, since I thought of this some years ago) My friend, Arlyn Lamb of Lakeville, Minnesota was sincere in his miss
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