Benz Bz.IV
The Benz Bz.IV was a German six-cylinder, water-cooled, inline engine developed for aircraft use. Deliveries began in 1916 and some 6,400 were produced.
| Bz.IV | |
|---|---|
 | |
| A Benz Bz.IV at the National Air and Space Museum's Udvar-Hazy Center (2017) | |
| Type | Inline piston engine |
| National origin | Germany |
| Manufacturer | Benz |
| First run | c. 1916 |
| Number built | 6,400 |
| Developed from | Benz Bz.III |
| Developed into | Benz Bz.IVa |
Design and development
The Bz.IV was a dual-camshaft design, with two intake and two exhaust valves per cylinder. The cylinders were cast iron surrounded by a sheet metal cooling jacket. The crankcase was aluminium and pistons were initially steel but later versions had aluminium pistons. A high compression version of the engine (Bz IVü) was produced from 1917 onwards and can be recognised by the red bands painted on each cylinder. In February 1918, pistons from a Bz.IV were the first captured aluminium pistons to be examined by the British Ministry of Munitions.[1]
Applications
- AEG C.VI
- AEG J.I
- AGO C.IV
- Albatros C.VII
- Albatros C.XIV
- Albatros J.I
- Chitty 2 (racing car)
- DFW C.V
- Dobi-II
- Friedrichshafen FF.49
- Friedrichshafen G.II
- Halberstadt C.III
- Halberstadt C.V
- Junkers J.I
- LFG Roland C.III
- LVG C.VI
- NAVO RK-P4/220
- Pfalz D.XII
- Pfalz D.XIV
- Riesenflugzeug, the German giants of WWI
Specifications
Data from [2]
General characteristics
- Type: 6-cylinder, water-cooled, inline aircraft piston engine
- Bore: 145 mm (5.7 in)
- Stroke: 190 mm (7.5 in)
- Displacement: 18.825 l (1,148.8 cu in)
- Length: 1,990 mm (78.3 in)
- Width: 530 mm (20.9 in)
- Height: 1,150 mm (45.3 in)
- Dry weight: 370 kg (815.7 lb)
Components
- Valvetrain: Twin inlet and exhaust valves operated by pushrod actuated double rockers
- Fuel system: Two Benz 2-jet carburettors feeding three cylinders each
- Fuel type: Gasoline specific gravity 0.72
- Oil system: Pressure feed at 0.2 MPa (28 psi): 50% Vacuum Heavy, 50% Sternol
- Cooling system: Water-cooled
Performance
- Power output: 170 kW (228.0 hp) at 1,400 rpm
- Specific power: 9.1 kW/l (0.2 hp/cu in)
- Compression ratio: 4.91:1
- Fuel consumption: 85.2 l (150 imp pt) / hour
- Specific fuel consumption: 0.495 l/kW/hr (0.65 pts/hp/hour)
- Oil consumption: 2.6 l (4.5 imp pt) / hour
- Power-to-weight ratio: 0.3796 kW/kg (0.231 hp/lb)
References
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Wikimedia Commons has media related to Benz Bz.IV. |
- "Report on Aluminium Pistons from 230 HP Benz Engines". Flight. 4 July 1918.
- Grey, C.G. (1969). Jane's All the World's Aircraft 1919 (Facsimile ed.). David & Charles (Publishing) Limited. pp. 1b to 145b. ISBN 978-0-7153-4647-1.
- Grey, C.G. (1969). Jane's All the World's Aircraft 1919 (Facsimile ed.). David & Charles (Publishing) Limited. pp. 1b to 145b. ISBN 978-0-7153-4647-1.
- Kroschel, Gunter and Helmust Stützer. (1977) Die deutschen Militarflugzeuge 1910-1918 Wilhelmshaven: Lohse-Eissing Mittler.
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