{{Refimprove|date=January 2009}} <!-- This article is a part of Wikipedia:WikiProject Aircraft. Please see Wikipedia:WikiProject Aircraft/page content for recommended layout. --> {{infobox aero engine |name = BMW IV |image = File:BMW IVa vl TCE.jpg |caption = Preserved BMW IVa |engine_type=Inline engine |manufacturer=BMW |national_origin= |first_run=1919 |major_applications= |number_built = |developed_from = |developed_into = {{ubl | BMW V | BMW VI }} |variants_with_their_own_articles = }}

The '''BMW IV''' was a six-cylinder, water-cooled inline aircraft engine built in Germany in the 1920s. Power was in the 180&nbsp;kW (250&nbsp;hp) range.

== World record == On 17 June 1919 Franz Zeno Diemer flew a DFW F37, powered by a BMW IV engine to an unofficial world record height of {{convert|9760|m|ft|abbr=on|0}} from Oberwiesenfeld, reaching that altitude in 89 minutes.<ref>{{cite web|url=http://www.bmwgroup.com/e/nav/index.html?http://www.bmwgroup.com/e/0_0_www_bmwgroup_com/forschung_entwicklung/science_club/veroeffentlichte_artikel/2008/news200804.html|title=BMW group|author=|date=|publisher=|accessdate=27 July 2013|archive-date=28 February 2012|archive-url=https://web.archive.org/web/20120228204311/http://www.bmwgroup.com/e/nav/index.html?http://www.bmwgroup.com/e/0_0_www_bmwgroup_com/forschung_entwicklung/science_club/veroeffentlichte_artikel/2008/news200804.html|url-status=dead}}</ref> Diemer stated at the time, "I could have gone much higher, but I didn't have enough oxygen." {{citation needed|date=July 2013|reason=see Talk}}

==Applications== * Arado SC I * Albatros L 72 * Albatros L 74 * Caspar C 27 * DFW F37 * Heinkel HD 22 * Heinkel HD 24 * Heinkel HD 39 * Junkers A 35 * Junkers F 13 * LFG V 59 * LFG V 60 * Polikarpov R-1 BMW (Soviet unlicensed copy of Airco DH.9A) * Kalinin K-Series * Rohrbach Ro VII Robbe * Rohrbach Ro VIII Roland I * Type 91 Heavy Tank * Type 95 Heavy Tank

==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 is missing, leave the parameters blank (do not delete them). For additional lines, end your alt units with )</li> and start a new, fully formatted line with <li> --> |ref=''BMW Type IV description and user manual.''<ref>[https://bmw-grouparchiv.de/research/detail/index.xhtml?id=3052440 bmw-grouparchiv.de] Retrieved: 5 December 2016</ref> |type=Six-cylinder inline piston engine |bore={{convert|160|mm|in|abbr=on|2}} |stroke={{convert|190|mm|in|abbr=on|2}} |displacement={{convert|22.92|L|cuin|abbr=on}} |length= |diameter= |width= |height= |weight={{cvt|290|kg}} |valvetrain=Overhead camshaft, two valves per cylinder |supercharger= |turbocharger= |fuelsystem= |fueltype= |oilsystem= |coolingsystem=Water-cooled |power=Nominal {{cvt|230|PS|hp kW|0}} , maximum continuous {{cvt|250|PS|hp kW|0}} |specpower= |compression=5.5:1 |fuelcon= |specfuelcon= |oilcon= |power/weight=

|designer= |reduction_gear=

|general_other= |components_other= |performance_other= }}

==See also== {{aircontent <!-- other related articles that have not already linked and do not fit the specific entries below: --> |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= *Liberty L-6 (United States)

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

== References == {{reflist}}

== External links == {{commons category|BMW IV}}

{{BMW aeroengines}}

Category:BMW aircraft engines Category:1910s aircraft piston engines Category:Straight-six engines Category:Liquid-cooled aircraft piston engines