Benz Bz.IV

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 IVsü) was produced from 1917 onwards. In February 1918, pistons from a Bz.IV were the first captured aluminium pistons to be examined by the British Ministry of Munitions.{{Cite journal

Variants

;IV : (1916) Main production variant produced by Benz & Cie.

;IVmarta : (1916) Licensed production of the Benz Bz.IV in Austria-Hungary by Magyar Automobil Részvény Társaság Arad (MARTA). The Marta produced version was heavier and had a lower compression ratio than the German original.

;IVsü : (1917) Overcompressed version producing 275 hp at altitudes above 2000 m. Also known as the IVs, IVü or IVaü. The "ü" in the model description stands for überverdichtet (German: "overcompressed”) while the "s" denotes the use of steel cylinder liners.

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
• Siemens-Schuckert R.III
• Siemens-Schuckert R.IV
• Siemens-Schuckert R.V
• Siemens-Schuckert R.VI
• Zeppelin-Staaken R.IV
• Zeppelin-Staaken R.XVI

Specifications

| and start a new, fully-formatted line with -- |power/weight= 0.3796 kW/kg (0.231 hp/lb)

References

Bibliography

• Kroschel, Gunter and Helmust Stützer. (1977) Die deutschen Militarflugzeuge 1910-1918 Wilhelmshaven: Lohse-Eissing Mittler.

References

1. Düsing, Michael. (2022). "German & Austro-Hungarian Aero Engines of WW1". Aeronaut Books.
2. Grey, C.G.. (1969). "Jane's All the World's Aircraft 1919". David & Charles (Publishing) Limited.