A U engine is a piston engine made up of two separate straight engines (complete with separate crankshafts) joined by gears or chains. It is similar to the H engine which couples two flat engines.
The design is also sometimes described as a "twin bank" or "double
bank" engine, although these terms are sometimes used also to describe V engines.
This configuration is uncommon, as it is heavier than a V design. The
main interest in this design is its ability to share common parts with
straight engines. However, V engines with offset banks can also share
straight engine parts (except for the crankshaft), and this is therefore
a far more common design today when both engine forms are produced from
the same basic design.
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