Tractor engines tend to have much longer stroke as compared to bore - then a car or pickup truck engine. Long stroke allows good low-end torque. It's also why the Cummins diesels were so popular when they first showed up in Dodge pickups. They were the only true HD, long-stroke engine around in consumer vehicles (same engine also used in some tractors).
Also, most tractor engines also serve as part of the tractor frame and hold the front ends on - and sometimes also support front loaders. So, those blocks have to be extra heavy.
Tractor engines also, as most other HD engines, are "derated" in power output specs since they are intended to make high power much of the time - unlike most cars and trucks.
But to be fair, HD truck engines get a similar rating called "B" rating - when they ARE tested in full-time HD use.
By the way, some tractors have car engines - like the Allis Chalmers ED40, or Massey Ferguson with the Standard Diesel - which was also used in small British cars.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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