{{Short description|1930s Czech piston aircraft engine}} <!-- This article is a part of Wikipedia:WikiProject Aircraft. Please see Wikipedia:WikiProject Aircraft/page content for recommended layout. --> {{infobox aero engine |name= Junior |image = File:Walter Junior 4 (1932-6).jpg |caption = |engine_type= Inline piston engine |national_origin = Czechoslovakia |manufacturer= Walter Aircraft Engines |first_run= 1932 |major_applications= |number_built = |developed_from = |developed_into = |variants_with_their_own_articles = }}
The '''Walter Junior''' was a family of four cylinder air cooled inverted inline engines produced by Walter Aircraft Engines in Czechoslovakia in the 1930s for aircraft, characterised by a bore and stroke of {{cvt|4.53|x|5.51|in|order=flip}}, a displacement of {{cvt|354.8|cuin|order=flip}} and producing roughly {{cvt|105|hp|order=flip}}.
The Junior was also built in Poland as the '''P.Z. Inż. Junior'''.<ref name="Forbes">{{cite web |last1=Forbes |first1=Peter |last2=Forbes |first2=Rita |title=Engine Data Sheets:Czechoslovakian Aero Engines: Page 117 of 140 |url=http://www.oldengine.org/members/diesel/Duxford/czechaer1.htm |website=Peter & Rita Forbes' Engine Webpages |accessdate=20 April 2018 |archive-date=4 August 2007 |archive-url=https://web.archive.org/web/20070804020858/http://www.oldengine.org/members/diesel/Duxford/czechaer1.htm |url-status=dead }}</ref>
== Variants == ;Walter Junior 4-I :{{convert|105|hp|kW|abbr=on|disp=flip}} at 2,000 rpm.
;Walter Junior-Major :{{convert|120|hp|kW|abbr=on|disp=flip}} at 2,100 rpm (nominal), {{convert|130|hp|kW|abbr=on|disp=flip}} at 2,350 rpm (maximum).
;P.Z. Inż. Junior :Approximately 600 engines manufactured under license in Poland by Państwowe Zakłady Inżynierii, Warsaw.
;Elizalde J4 :Approximately 150 engines manufactured under license in Spain by Elizalde SA Barcelona.
==Applications== [[File:Beneš-Mráz Be-150 Beta-Junior.jpg|thumb|Beneš-Mráz Be-150 Beta-Junior]] *Adaro Chirta *Aero A.34 *Beneš-Mráz Be-150 Beta-Junior *Breda Ba.15 *de Havilland Puss Moth *González Gil-Pazó GP-1 *Hispano-Suiza E-34 *Hopfner HS-10/32 *Praga BH-111 *RWD 5 *RWD 8 *RWD 10
==Specifications== thumb {{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= |type=4-cylinder inverted air-cooled inline |bore={{convert|115|mm|in|abbr=on}} |stroke={{convert|140|mm|in|abbr=on}} |displacement={{convert|5.816|L|cuin|abbr=on|1}} |length={{convert|1182|mm|in|abbr=on}} |diameter= |width={{convert|526|mm|in|abbr=on}} |height={{convert|767|mm|in|abbr=on}} |weight={{convert|135|kg|lb|abbr=on}} dry |valvetrain=One intake and one exhaust valve per cylinder operated by pushrods and rockers |supercharger= |turbocharger= |fuelsystem=Zenith or Claudel-Hobson carburettor |fueltype=68 octane petrol |oilsystem=Pressure fed, dry sump |coolingsystem=Air-cooled |power= {{convert|105|hp|kW|abbr=on|disp=flip}} at 2,000 rpm (nominal), {{convert|120|hp|kW|abbr=on|disp=flip}} at 2,200 rpm (maximum) |specpower= |compression=5.2:1 |fuelcon= |specfuelcon= |oilcon= |power/weight= |designer= |reduction_gear=Direct drive, left hand tractor |general_other= |components_other= |performance_other= }}
==See also== {{aircontent <!-- other related articles that have not already linked: --> |see also=
<!-- designs which were developed into or from this aircraft: --> |related=
<!-- aircraft that are of similar role, era, and capability 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= *Menasco Pirate
<!-- See WP:Air/PC for more explanation of these fields. --> }}
==References== {{Commons category}} {{reflist}}
{{Walter aeroengines}}
Junior Category:Aircraft air-cooled inline piston engines Category:1930s aircraft piston engines Category:Inverted aircraft piston engines