Boxer

Technology / Motorcycle / Boxer: Refers to the BMW R-Series engine that has two horizontally opposed cylinders.
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Boxer Twin

Technology / Motorcycle / Boxer Twin: A horizontal engine configuration with the two pistons opposing each other, commonly found on BMW twin-cylinder motorcycles. The term comes from the resemblance of fists coming towards each other. MORE

Flat Twin

Technology / Motorcycle / Flat Twin: 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 MORE