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Junkers L2




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. First run in 1925, it was a 4-stroke six-cylinder water-cooled inline engine and powered many Junkers aircraft until replaced by the more powerful L5.

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. It initially developed a cruise power of 195 horsepower (hp) (145 kW) at 1,550 rpm but was developed to 220 hp (164 kW).

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.


L2 initial version.
L2a refined L2, 230 hp.


Early versions of:
Junkers F 13
Junkers A 20
Junkers G 23
Junkers G 24
Junkers W 33
Junkers Ju 21


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



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