You can read engineering specs in regard to harmonics, balancing, ad nauseum, but generally speaking - three and fives are easier to balance and naturually smoother. Four cylinder engines are not - and just about always have a vibration problem when they get over a certain cubic inch size unless alternative/extra balancers are used. That's why Deere fours use twin balancing shafts (1020, 2020, 450 crawlers, etc.) or Deere big fours e.g. 3020 and 500 industrial use a balancing box added to the bottom of the engine. Deere threes and sixes don't need the extra balancing. Even with cars and smaller fours, many have used balancing shafts. Rememer Chrysler's "Silent Shaft Arrow?"
Threes and fives have been around for a long time - but from what I've read, not always very marketable in cars because they don't sound appealing in sales literature. Deere used the Perkins three cylinder diesel for years in Europe, and then finally built their own.
I'll add that for a few years, Deere tried to cheapen their smaller fours by leaving the two balancing shafts out - first doing it in the 210C backhoe/loader. They vibrated so bad the mufflers cracked.
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Today's Featured Article - Product Review: JB Weld - by Staff. JB Weld is basically an epoxy glue that does an exceptionally good job of bonding to cast iron and steel along with several other materials. As I mentioned, it is so common that I have yet to buy a tractor that did not have JB Weld used somewhere. It is sometimes used so well you can't tell its there and other times used as a sloppy quick fix. Finding where and how it can be used correctly is key to whether you are using it as an "inelegant hack" or an integral solution to difficult and expens
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