Lister 5/1 Diesel

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Aviation engines Page 4 - Diesels

Another German company which was involved or getting involved at the time (1930's) was BMW, who went on to produce so many engines during WW2 for the war effort, matched only by Daimler-Benz as the premier aircraft engine makers in the country.

The Junkers Motor Manufacturing Co.of Dassau were well ahead of the game, and in 1929 announced completion of their transport aircraft engine, which was subsequently to pass both the German and International Type Tests, and went into airline service in the summer of 1931. The engine was an opposed piston six-cylinder two-stroke diesel, with cylinders of 120 mm X 210 mm giving a published displacement of 14252 cc or 867 cu ins, but published figures quote 1738 cu ins, double that figure, probably allowing for the twin pistons in the same bore.

 Junkers Opposed-Piston 6cyl Aero Diesel

Junkers Opposed-Piston 6cyl Aero Diesel

The engine was supercharged or more correctly it was scavenged by a single-stage centrifugal compressor, driven off the rear of the crankshaft through a geared drive and safety clutch. The engine produced 645 hp at 1700 rpm as a service rating, with 735 hp being seen on the type tests. Weight was a very agreeable 1760 lbs, which compares very well with the Beardmore engine on page 2. The injection system was quite complex, with four injector nozzles in the area between the pistons, two being supplied from a pump on one side of the engine, and two from the other side. Sfc was a good 0.365 lb per hp hr at full load.

 Junkers Opposed-Piston 6cyl Aero Diesel

Junkers Opposed-Piston 6cyl Aero Diesel

 Junkers Opposed-Piston 6cyl Aero Diesel

Junkers Opposed-Piston 6cyl Aero Diesel


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