A 12-cylinder piston inline engine in a V configuration (3 cylinders in 4 blocks), side-valve, designed and manufactured at the Sunbeam Motor Car Co. Ltd. It was used in the Sikorski Ilia Muromets, Short Bomber and Sopwith 860 Seaplane aircraft.
| Configuration | 12-cylinder V-type |
| Cooling | liquid |
| Displacement | 11.8 l |
| Weight | 500 kg |
| Maximum power | 225 hp at 2000 rpm |
