Junkers L2

L2

Type	4-stroke petrol 6-cylinder water-cooled inline aircraft engine
National origin	Germany
Manufacturer	Junkers Motorenbau GmbH (Jumo)
First run	1925
Number built	58

The Junkers L2 was Junkers' first water-cooled four-stroke engine and the first to be built on a production line, though only 58 were made. It was a six-cylinder inline engine and powered many Junkers aircraft until replaced by the more powerful L5.

Design and development

The Junkers L2 (the L signifying a four-stroke petrol engine rather than a two-stroke diesel) had some features in common with their first petrol engine, the L1, both six-cylinder upright direct drive inline engines with four overhead camshaft driven valves per cylinder, but was water-cooled rather than air-cooled and had a much greater swept volume.^[1] It initially developed a cruise power of 195 horsepower (hp) (145 kW) at 1,550 rpm but was developed to 220 hp (164 kW).^[2]

Operational history

The L2 powered early versions of several Junkers aircraft. It was soon replaced in these models by the more powerful Junkers L5 and only 58 L2s were built.^[1]

Variants

L2 initial version.
L2a refined L2, 230 hp.^[1]

Applications

Early versions of^[1]

Re-engined^[3]

Junkers Ju 21

Specifications (L2)

Data from Kay (2004) pp.263-4

General characteristics

Type: 6-cylinder upright water-cooled inline 4-stroke piston engine
Bore: 150 mm (5.906 in)
Stroke: 180 mm (7.09 in)
Displacement: 19.1 L (1,166 cu in)
Length: 1.58 m (5 ft 2¾ in)
Width: 0.555 m (1 ft 9¾ in)
Height: 1.085 m (3ft 6¾ in)
Dry weight: 310 kg (684 lb)

Components

Valvetrain: Two inlet and two exhaust valves per cylinder, overhead camshaft operated
Fuel system: Twin carburettors
Fuel type: Petrol
Oil system: Combined splash and pressure
Cooling system: Water-cooled
Reduction gear: Direct drive

Performance

Power output: cruise 195 hp (145 kW) at 1,550 rpm, take-off 230 hp (171 kW)
Fuel consumption: 31.82 kg/h (70.16 lb/hr)

References

Wikimedia Commons has media related to Junkers L2.

1 2 3 4 Kay, Antony (2004). Junkers Aircraft & engines 1913-1945. London: Putnam Aeronautical Books. pp. 263–4. ISBN 0-85177-985-9.
↑ Gunston, Bill (1989). World Encyclopaedia of Aero Engines (2 ed.). Wellingborough: Patrick Stephens Ltd. p. 85. ISBN 1-85260-163-9.
↑ Kay (2004) Ibid, p. 44

Junkers Jumo aircraft engines

Piston engines	L1 L2 L5 L7 L8 L55 L88 203 204 205 206 207 208 210 211 213 218 222 223 224

Turbojet	004 012 022

See also HeS 30 (Junkers design built by Heinkel)

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