I suspect it has to be a Detroit Diesel 2-stroke-cycle powered tractor - and the bigger the better.
The Big Bud tractor - model 16V-747 has 1000 engine horsepower, 900 drawbar horsepower, and 1472 cubic inches. That comes to .679 of a horsepower per cubic inch. I don't know of any other tractors that high.
Some lessers ones are:
Oliver Super 99 GM with 213 c.i. 3-71 Detroit 78.7 horsepower .369 horse per c.i.
Big Deere 4-stoke is close though - Deere 8430T 548 c.i. 298 horse .543 of a horse per c.i.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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