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((More citations needed|date=August 2008))
<!-- This article is a part of [[Wikipedia:WikiProject Aircraft]]. Please see [[Wikipedia:WikiProject Aircraft/page content]] for recommended layout. -->
{|((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= [[Reciprocating engine|Inline piston engine]]
 |national origin = Germany
 |manufacturer= [[Mercedes-Benz|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]].<ref>((Cite journal
  |journal=[[Flight (magazine)|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
))</ref>

==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]]
* [[Riesenflugzeug]], the German giants of WWI
))

==Specifications==
((pistonspecs
|<!-- If you do not understand how to use this template, please ask at [[Wikipedia talk:WikiProject Aircraft]] -->
<!-- Please include units where appropriate (main comes first, alt in parentheses). If data are missing, leave the parameter blank (do not delete it). For additional lines, end your alt units with </li> and start a new, fully-formatted line with <li> -->
|ref=<ref name=JAWA1919>((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))</ref>
|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)
))

==See also==
((aircontent
<!-- first, the related articles that do not fit the specific entries: -->
|see also=

<!-- designs which were developed into or from this aircraft or engine: -->
|related=

<!-- aircraft that are of similar role, era, and capability as this design: -->
|similar aircraft=

<!-- relevant lists that this aircraft appears in: -->
|lists=
*[[List of aircraft engines]]
<!-- For aircraft engine articles.  Engines that are of similar to this design: -->
|similar engines=

<!-- See [[WP:Air/PC]] for more explanation of these fields. -->
))

==References==
((Commons category|Benz Bz.IV))
((Reflist))
((refbegin))
*((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.
* [https://web.archive.org/web/20070210052043/http://www.wwiaviation.com/engines/Engines.html] 
((refend))

((Benz aeroengines))

[[Category:1910s aircraft piston engines]]

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