The Argus As 8 was a four-cylinder, air-cooled, inverted inline aircraft engine produced in Germany by Argus Motoren in the 1930s.
As 8A
Initial production version 71 kW (95 hp) maximum for 5 minutes, 60 kW (80 hp) continuous.
As 8B
A more powerful variant developing 101 kW (135 hp) maximum for 5 minutes, 86 kW (115 hp) continuous.
As 8R
A variant produced for sport aircraft, particularly for competition use, developing 110 kW (150 hp) for take-off. Featuring:
Increased compression ratio, from 5.36 to 5.8
Improved cooling by increasing the numbers of cooling fins at the cylinder head and the cylinder body
Increasing the heat dispersing area of the pistons
Improved crankcase and oil cooling
Improved cylinder charging
Modified valve timing
Albatros L 100
Albatros Al 101
Arado L II (As 8A)
Arado L IIa (As 8R)
BFW M.23
BFW M.27
BFW M.29
Heinkel He 64
Klemm L 25E
Ruhrtaler Ru.3
Data from
Type: 4-cylinder inverted air-cooled in-line piston engine
Bore: 120 mm (4.72 in)
Stroke: 140 mm (5.51 in)
Displacement: 6.333 l (386.46 cu in)
Length: 1,075 mm (42.3 in) without airscrew hub
Width: 470 mm (18.5 in)
Height: 731 mm (28.8 in)
Dry weight: 116 kg (256 lb) empty
Valvetrain: Overhead valves operated by pushrods and rockers
Fuel system: One down-draught carburretor
Fuel type: Aviation gasoline
Oil system: Pressure feed
Cooling system: Air-cooled
Power output: 101 kW (135 hp) maximum for 5 minutes at 2200 rpm, 86 kW (115 hp) continuous at 2090 rpm.
Compression ratio: 5.36:1
Specific fuel consumption: 212 g/PSh at maximum, 236 g/PSh at continuous
Oil consumption: 1.2 kg (2.6 lb) / h
