BMW IV

The BMW IV was a six-cylinder, water-cooled inline aircraft engine built in Germany in the 1920s. Power was in the 180 kW (250 hp) range.

BMW IV
Preserved BMW IVa
Type	Inline engine
Manufacturer	BMW
First run	1919
Developed into	BMW V BMW VI

World record

On 17 June 1919 Franz Zeno Diemer flew a DFW F37, powered by a BMW IV engine to an unofficial world record height of 9,760 m (32,021 ft) from Oberwiesenfeld, reaching that altitude in 89 minutes. Diemer stated at the time, "I could have gone much higher, but I didn't have enough oxygen."

Applications

• Arado SC I
• Albatros L 72
• Albatros L 74
• Caspar C 27
• DFW F37
• Heinkel HD 22
• Heinkel HD 24
• Heinkel HD 39
• Junkers A 35
• Junkers F 13
• LFG V 59
• LFG V 60
• Polikarpov R-1 BMW (Soviet unlicensed copy of Airco DH.9A)
• Rohrbach Ro VII Robbe
• Rohrbach Ro VIII Roland I
• Type 91 Heavy Tank
• Type 95 Heavy Tank

Specifications

Data from BMW Type IV description and user manual.

General characteristics

• Type: Six-cylinder inline piston engine
• Bore: 160 mm (6.30 in)
• Stroke: 190 mm (7.48 in)
• Displacement: 22.92 L (1,399 cu in)
• Dry weight: 290 kg (640 lb)

Components

• Valvetrain: Overhead camshaft, two valves per cylinder
• Cooling system: Water-cooled

Performance

• Power output: Nominal 230 PS (227 hp; 169 kW) , maximum continuous 250 PS (247 hp; 184 kW)
• Compression ratio: 5.5:1

See also

Comparable engines

• Liberty L-6 (United States)

Related lists

• List of aircraft engines