Junkers Jumo 207 D-V2 In-line 6 Diesel Engine


Display Status:

This object is not on display at the National Air and Space Museum. It is either on loan or in storage.

Collection Item Summary:

Dr. Hugo Junkers started development of his Diesel aircraft engines in a small factory at Dessau, Germany in 1911. His early engines functioned on the two-stroke cycle principle with piston-controlled parts, as did his later Junkers Jumo Diesels. Among the advantages of later, refined Diesel aircraft engines were lower specific fuel consumption (for long-range applications), lower exhaust gas temperature (for exhaust-driven supercharger installations), and reduced fire hazard as compared to conventional reciprocating aircraft engines.

The Jumo 207 was a Jumo 205 with a turbo-supercharger. A Diesel operating on a two-stroke cycle, it incorporated six cylinders and 12 opposed pistons (i.e. 2 per cylinder) in an in-line, liquid-cooled configuration. The Jumo 207 could maintain its sea-level rated power to approximately 7,900 m (26,000 ft.). The Jumo 207 A and B powered the Junkers Ju 86 P and R reconnaissance/bomber aircraft that had an absolute ceiling of approximately 15,000 m (49,000 ft.).

Collection Item Long Description:


Circa World War II

Inventory Number


Physical Description

  • Type: Reciprocating, in-line, 6 cylinders with 12 pistons, two cycle, liquid-cooled, Diesel, supercharger
  • Power rating: 746 kW (1,000 hp) at 3,000 rpm
  • Displacement: 16.6 L (1,526 cu in.)
  • Bore and Stroke: 105 mm (4.1 in.) x 2 x 160 mm (6.3 in.)
  • Weight: 648.6 kg (1,430 lb)

Credit Line

Transferred from the U.S. Navy, Naval Supply Center, Cheatham Annnex, Williamsburg, Virginia.

Country of Origin



Magnesium, Paint, Steel, Aluminum, Nickel plating


Height 132.6 cm (52.2 in.), Width 59.9 cm (23.6 in.), Depth 218.4 cm (86 in.)

Data Source

National Air and Space Museum

Restrictions & Rights

Do not reproduce without permission from the Smithsonian Institution, National Air and Space Museum


PROPULSION-Reciprocating & Rotary