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Rolls-Royce Buzzard was a British piston aero engine of 36.7 litres (2,240 cubic inches) capacity that produced about 800 horsepower (600 kW). Designed and built by Rolls-Royce Limited it is a V12 engine of 6 in (150 mm) Bore and 6.6 in (170 mm) Stroke. Only 100 were made. A further development was the Rolls-Royce R engine. The Buzzard was developed by scaling-up the Rolls-Royce Kestrel Engine. 
List from Lumsden.
Buzzard IMS, (H.XIMS)
(1927), Maximum power 955 hp (712 kW), nine engines produced at Derby.
Buzzard IIMS, (H.XIIMS)
(1932-33), Maximum power 955 hp (712 kW), reduced propeller drive ratio (0.553:1), 69 engines produced at Derby.
Buzzard IIIMS, (H.XIVMS)
(1931-33), Maximum power 937 hp (699 kW), further reduced propeller drive ratio (0.477:1), 22 engines produced at Derby.
Specifications (Buzzard IMS)
Data from Lumsden 
Type: Liquid-cooled V12 Aircraft piston engine
6 in (152.4 mm) Bore:
6.6 in (167.6 mm) Stroke:
2,239.3 in³ (36.7 L) Displacement:
Length: 75.7 in (1,923 mm)
Width: 30.6 in (777 mm)
Height: 44.4 in (1,128 mm) 1,140 lb (517 kg) Dry weight:
^ Rubbra 1990, p. 59.
^ Lumsden 2003, p.198.
British Piston Engines and their Aircraft. Marlborough, Wiltshire: Airlife Publishing, 2003. ISBN 1-85310-294-6. Rubbra, A.A. Rolls-Royce Piston Aero Engines - A Designer Remembers. Rolls-Royce Heritage Trust. Historical Series no 16. 1990. ISBN 1-872922-00-7]