The BMW 801 was a powerful German air-cooled radial aircraft engine built by BMW and used in a number of German military aircraft of World War II. The engine's cylinders were in two rows of seven cylinders each, the bore and stroke were both 156 mm (6.14 in), giving a total capacity of 41.8 litres (2,502 in³). The engine generated between 1,560 and 2,000 PS (1,540-1,970 hp, or 1,150 and 1,470 kW). The unit (including mounts) weighed from 1,010 to 1,250 kg and was about 1.29 m (51 in) across, depending on the model.