Avia M 337
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.
|Right side view of a Walter M337; the front cylinder is hidden by the engine cowling|
|Type||six-cylinder inverted inline piston engine|
|Manufacturer||Walter Aircraft Engines/Avia/LOM|
|Major applications||Let L-200 Morava |
Zlín Z 43
- 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 - 175 kW (235 hp).
- M 337BK
- Aerobatic version of B.
- M 337C
- Increased compression ratio - 188 kW (252 hp)
- M 137A
- Unsupercharged version of M 337 130 kW (180 hp) take-off power. Aerobatics allowed.
- M 137AZ
- As M 137A, with filtered air feed
- M 437
- Gear ratio 0.7:1 180 kW (240 hp)
Specifications (M 337)
- 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)
- Width: 472 mm (18.58 in)
- Height: 628 mm (24.72
- Dry weight: 148 kg (326.3 lb)
- Valvetrain: OHC two camshaft operated valves per cylinder, sodium filled exhaust valve
- Supercharger: Centrifugal
- Fuel system: Low-pressure fuel injection
- Fuel type: Min 72-78 Octane
- Oil system: Dry sump pressure feed system
- Cooling system: Air-cooled
- Power output: 157 kW (210 hp) at 2,750 rpm (take-off)
- Power-to-weight ratio: 1.06 kW/kg (0.64 hp/lb)
- J W R Taylor 1980, p.692.
- Taylor, John W R (editor) (1980). Jane's All The World's Aircraft 1980-81. London: Jane's. ISBN 0-7106-0705-9.CS1 maint: extra text: authors list (link)