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 - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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