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.

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.

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