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.
Comments
3 Comments so far
[...] Flat-twin, BMW motorcycles with an air-cooled engine that were built from 1923 up to 1995. The airhead design was replaced by the oilhead, which uses oil, in addition to air, to transfer engine heat to the atmosphere. _uacct = “UA-2039470-2″; urchinTracker(); [...]
[...] 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 [...]
[...] flat-twin engine mounted with cylinders positioned in line with the [...]