The Austro Engine E4 (marketed as the AE 300) is a liquid-cooled, inline, four-cylinder, four-stroke, aircraft diesel engine.^[2][3] The engine is manufactured by Austro Engine, an Austrian-based company and subsidiary of Diamond Aircraft Industries.

Development

The engine is based on the Mercedes-Benz OM640 road Diesel engine.^[4]

Following Diamond's "General Aviation Single Point of Contact" strategy, Austro Engine started to design a new engine for use on Diamond products in 2005. It received its type certificate in January 2009.^[2]

Applications

• Diamond DA40
• Diamond DA42
• Diamond DA50
• Diamond DA52
• Diamond DA62 180hp AE330.

Specifications (E4)

Data from Austro Engine and type certificate^[1][2][3]

General characteristics

• Type: Four-cylinder, four-stroke diesel aircraft engine
• Bore: 83 mm (3.3 in)
• Stroke: 92 mm (3.6 in)
• Displacement: 1,991 cm³ (121 cu in)
• Length: 738 mm (29 in)
• Width: 855 mm (34 in)
• Height: 574 mm (23 in)
• Dry weight: 186 kg (410 lb)
• Mean time between failures: > 100,000 h
• Time between overhauls: 1,800 h

Components

• Fuel type: Kerosene and diesel (EN 590)
• Cooling system: liquid-cooled
• Reduction gear: Gearbox with 1:1.69 ratio

Performance

• Power output: 168 hp (125 kW) (maximum takeoff and continuous power) at up to 2,300 propeller RPM
• Specific power: 1.38 hp/cu in (62.80 kW/L)
• Fuel consumption: 35 L/h (9.25 US gal/h) at 100% power, and

19 L/h (5.02 US gal/h) at 60% power

• Power-to-weight ratio: 0.41 hp/lb (0.67 kW/kg)
• Torque: 512 Nm (maximum)