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 - Search For Spares - by Anthony West (UK). Following on from the aquisition of the old Fordson F, I was very much in need of spares. As a novice though I didn't appreciate the fact that there were so many Fordson tractors made, that all the other makes seem rare by comparison. As far as I was aware a fordson was a fordson and it was only through trial an
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