Nakajima Mamoru 11, Radial 14 Engine
date: label: Date
content: Circa World War II
name: label: Manufacturer
content: Nakajima Hikoki K. K.
notes: label: Physical Description
content: Type: Reciprocating, 14 cylinders, 2 rows, radial, air-cooled
label: Physical Description
content: Power rating: 1,394 kW (1,870 hp) at 2,600 rpm
label: Physical Description
content: Displacement: 44.49 L (2,715 cu. in.)
label: Physical Description
content: Bore and Stroke: 155 mm (6.1 in.) x 170 mm (6.69 in.)
label: Physical Description
content: Weight: Not available
label: Physical Description
content: Manufactured circa World War II
label: Physical Description
content: Has baffles; missing data plate; some cooling fins bent
label: Summary
content: Nakajima provided Japan with its first large radials by building licensed Bristols beginning in the late 1920s, and Gnome-Rhone engines beginning in 1936. Nakajima built three 14-cylinder radial engines. The pre-World War II Mamoru possibly shares characteristics with the Pratt & Whitney R-2000. It was the most powerful 14-cylinder engine ever built, with versions at 1,790 kW (2,400 hp) and one of the largest at 44.49 L (2,715 cu. in.).
label: Summary
content: This engine is of the type that powered the World War II Japanese Nakajima B6N Navy Carrier Attack Bomber Tenzan Type 11 (Allied Code Name Jill). Between 1941 and 1944, 200 engines of all Mamoru series were manufactured, but these were generally not considered successful. After 1945, the company became Fuji, building airframes only.
place: label: Country of Origin
content: Japan
setName: label: See more items in
content: National Air and Space Museum Collection
creditLine: label: Credit Line
content: Transferred from the U.S. Navy
dataSource: label: Data Source
content: National Air and Space Museum
identifier: label: Inventory Number
content: A19710933000
objectType: label: Type
content: PROPULSION-Reciprocating & Rotary
objectRights: label: Restrictions & Rights
content: CC0
physicalDescription: label: Materials
content: Aluminum, Steel, Rubber, Copper, Ceramic, Magnesium, Wood
label: Dimensions
content: Approximate: 162.56 x 226.06 x 167.64cm (5ft 4in. x 7ft 5in. x 5ft 6in.)
label: Dimensions
content: 3-D (Weight on stand): 1230.2kg (2712lb.)