Benz Bz.IV

{{Infobox aircraft begin

|name= Bz.IV

|image = Benz BZ 4S Aircraft Engine.jpg

|caption = A Benz Bz.IV at the National Air and Space Museum's Udvar-Hazy Center (2017)

}}

{{Infobox Aircraft Engine

|type= Inline piston engine

|national origin = Germany

|manufacturer= Benz

|first run= c. 1916

|major applications=

|number built = 6,400

|developed from = Benz Bz.III

|developed into = Benz Bz.IVa

|variants with their own articles =

}}

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.{{Cite journal

|journal=Flight

|title=Report on Aluminium Pistons from 230 HP Benz Engines

|date=4 July 1918

|url=http://www.flightglobal.com/pdfarchive/view/1918/1918%20-%200746.html

}}

Applications

{{columns-list|colwidth=30em|

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
Zeppelin-Staaken R.IV
Riesenflugzeug, the German giants of WWI

}}

Specifications

{{pistonspecs

|ref={{cite book|last=Grey|first=C.G.|title=Jane's All the World's Aircraft 1919|year=1969|publisher=David & Charles (Publishing) Limited|isbn=978-0-7153-4647-1 |pages=1b to 145b|edition=Facsimile}}

|type=6-cylinder, water-cooled, inline aircraft piston engine

|bore={{convert|145|mm|in|abbr=on|1}}

|stroke={{convert|190|mm|in|abbr=on|1}}

|displacement={{convert|18.825|L|cuin|abbr=on|1}}

|length={{convert|1,990|mm|in|abbr=on|1}}

|diameter=

|width={{convert|530|mm|in|abbr=on|1}}

|height={{convert|1,150|mm|in|abbr=on|1}}

|weight={{convert|370|kg|lb|abbr=on|1}}

|valvetrain=Twin inlet and exhaust valves operated by pushrod actuated double rockers

|supercharger=

|turbocharger=

|fuelsystem=Two Benz 2-jet carburettors feeding three cylinders each

|fueltype=Gasoline specific gravity 0.72

|oilsystem=Pressure feed at {{convert|28|psi|MPa|abbr=on|1|disp=flip}}: 50% Vacuum Heavy, 50% Sternol

|coolingsystem=Water-cooled

|power={{convert|170|kW|hp|abbr=on|1}} at 1,400 rpm

|specpower= 9.1 kW/L (0.2 hp/cu in)

|compression=4.91:1

|fuelcon={{convert|150|imppt|L|abbr=on|1|disp=flip}} / hour

|specfuelcon= 0.495 L/kW/hr (0.65 pts/hp/hour)

|oilcon={{convert|4.5|imppt|L|abbr=on|1|disp=flip}} / hour

|power/weight= 0.3796 kW/kg (0.231 hp/lb)

}}

References

Bibliography

{{cite book|last=Grey|first=C.G.|title=Jane's All the World's Aircraft 1919|year=1969|publisher=David & Charles (Publishing) Limited|isbn=978-0-7153-4647-1|pages=1b to 145b|edition=Facsimile}}
Kroschel, Gunter and Helmust Stützer. (1977) Die deutschen Militarflugzeuge 1910-1918 Wilhelmshaven: Lohse-Eissing Mittler.

External links

[https://web.archive.org/web/20070210052043/http://www.wwiaviation.com/engines/Engines.html]

Category:1910s aircraft piston engines