Type of engine layout in which the cylinders are placed at 180° to one another. It is also described as a flat twin or flat four, etc. Also known as a boxer engine.
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[...] A two cylinder internal combustion engine with the cylinders arranged on opposite sides of the crankshaft. The best known example is the ‘traditional’ (since 1923) BMW motorcycle engine, where it is known as the “Boxer. ” Also known as Horizontally Opposed. [...]