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 - George's Fordson Major - by Anthony West (UK). This is a bit of a technical info to add on to the article about George's Major in the "A Towny Goes Plowing" article. George bought his Major from a an implement sale about 18 years ago for £200.00. There is no known history regarding its origins or what service it had done, but the following work was undertaken by Harold alone to bring it up to show standard. From the engine number, it was found that the major was produced late 19
... [Read Article]
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