Horizontally Opposed seems to be what "boxer" is slang for.
The cylinders move in opposition away and towards.
If one drops the opposed and just uses horizontal, or flat, it becomes ambiguous between a boxer or a flat V.
Quote:
Originally Posted by masraum
The way I believe the writer meant this to read is that there are 2 sorts of horizontally opposed engines, flat and boxer. And the difference between flat and boxer is in the crankshaft configuration and how the piston pairs move relative to each other.
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