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The torque on the Diesel engine at peak HP must be much higher on the big Diesel than the auto engine.
the 9-16 hp rating for the tractor proved rather conservative when it was tested at Nebraska in April 1922, yielding over 13 hp at the drawbar and nearly 20 hp on the belt.
I wonder if some of the same thing happens with cars vs trucks. A Corvette may be able to spin its wheels for a few seconds with 500HP. Your semi will be able to push out 500 HP pulling a load uphill for miles.