This is what it's all about: the BMW air cooled, two cylinder, 1150 cc boxer engine. 90 bhp. Tough, reliable, proven techn… | Motorcycle engine, Bmw motorcycle, Bmw
The Venerable VW Air-Cooled Engine
Subaru's boxer engine celebrates its golden anniversary | Hemmings
VW Beetle Flat-Four Boxer Engine Kit – With Visible Working Internals
Here's a pic of a classic air cooled 6cylinder porsche boxer.
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Aircraft engines from 15 kW to 40 kW. Small and efficient
Singer presented a new air cooled boxer engine with 500 hp | Vehiclejar Blog