Avia M 337
{{Short description|1960s Czechoslovak piston aircraft engine}}
{{more footnotes|date=October 2013}}
| {{Infobox aircraft begin
|name =M 337 |image =WalterM337engine.JPG |caption=Right side view of a Walter M337; the front cylinder is hidden by the engine cowling }}{{Infobox Aircraft Engine |type =six-cylinder inverted inline piston engine |national origin =Czechoslovakia |manufacturer =Walter Aircraft Engines/Avia/LOM |designer = |major applications =Let L-200 Morava |produced = |number built= }} |
The Avia M 337 (originally designated the Walter M337) is an inverted six-cylinder air-cooled inline engine. It was developed by the Czechoslovak company as a six-cylinder derivative of the four-cylinder M 332 engine, going into production in 1960. An unsupercharged version of the M 337 is designated as the LOM M137. Production transferred to Avia in 1964, and to Letecke Opravny Malesice (LOM) in 1992.
Variants
;M 337A: Basic supercharged engine - not rated for aerobatics
;M 337R: Modified for pusher installation
;M 337AK: modified oil system for unlimited inverted flying. "Snap" aerobatics permitted.
;M 337AK1:AK fitted with alternator instead of generator
;M 337B:Increased max running speed (3000 rpm) - increased power - {{cvt|235|hp|order=flip}}.
;M 337BK:Aerobatic version of B.
;M 337C:Increased compression ratio - {{cvt|252|hp|order=flip}}
;M 137A: Unsupercharged version of M 337 {{cvt|180|hp|order=flip}} take-off power. Aerobatics allowed.
;M 137AZ:As M 137A, with filtered air feed
;M 437: Gear ratio 0.7:1 {{cvt|240|hp|order=flip}}
Applications
Specifications (M 337)
{{pistonspecs|
|ref=Jane's All The World's Aircraft 1980-81 J W R Taylor 1980, p.692.
|type=6-cylinder inverted air-cooled supercharged inline engine
|bore=105 mm (4.13 in)
|stroke=115mm (4.53 in)
|displacement=5.97 L (364.3 in3)
|length=1,410 mm (55.51 in)
|diameter=
|width=472 mm (18.58 in)
|height=628 mm (24.72
|weight=148 kg (326.3 lb)
|valvetrain=OHC two camshaft operated valves per cylinder, sodium filled exhaust valve
|supercharger=Centrifugal
|turbocharger=
|fuelsystem=Low-pressure fuel injection
|fueltype=Min 72-78 Octane
|oilsystem=Dry sump pressure feed system
|coolingsystem=Air-cooled
|power=157 kW (210 hp) at 2,750 rpm (take-off)
|specpower=
|compression=
|fuelcon=
|specfuelcon=
|oilcon=
|power/weight=1.06 kW/kg (0.64 hp/lb)
|designer=
|reduction_gear=
|general_other=
|components_other=
|performance_other=
}}
References
{{Commons category|Walter M337}}
{{reflist}}
- {{cite book| editor-last = Taylor| editor-first = John W R | title = Jane's All The World's Aircraft 1980-81| year = 1980| publisher = Jane's| location = London| isbn = 0-7106-0705-9 }}
- http://www.walterjinonice.cz/historie-spolecnosti-walter {{Webarchive|url=https://web.archive.org/web/20190803061506/http://www.walterjinonice.cz/historie-spolecnosti-walter |date=2019-08-03 }}
{{Avia aeroengines}}
{{Walter aeroengines}}
Category:Aircraft air-cooled inline piston engines
Category:1960s aircraft piston engines
Category:Inverted aircraft piston engines