The 1,170 cc air-cooled boxer engine is a type of internal combustion engine characterized by its horizontally opposed cylinder layout. This design allows for a lower center of gravity, improving vehicle stability. The engine's displacement of 1,170 cc indicates the total volume of all cylinders, which affects power output and efficiency. Air-cooled means that the engine relies on air flow rather than liquid coolant to dissipate heat. This feature simplifies the engine design and reduces weight, making it popular in various vehicles, including some models of the BMW motorcycle lineup.