Avia M 137 / M 337
Walter M 337
LOM M 137 / M 337
The Avia M 337 (originally designated the Walter M337) is an inverted six-cylinder air-cooled inline engine. It was developed 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 M 137. Production transferred to Avia in 1964, and to Letecke Opravny Malesice (LOM) in 1992.
Basic supercharged engine - not rated for aerobatics
Modified for pusher installation
modified oil system for unlimited inverted flying. "Snap" aerobatics permitted.
AK fitted with alternator instead of generator
Increased max running speed (3000 rpm) - increased power - 173 kW (235 hp).
Aerobatic version of B.
Increased compression ratio - 185 kW (252 hp)
Unsupercharged version of M 337 - 134 kW (180 hp) take-off power. Aerobatics allowed.
As M 137A, with filtered air feed
Falconar SAL Mustang
Let L-200 Morava
Zlín Z 526, Z 726
Zlín Z 43
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: two camshaft operated valves per cylinder, sodium filled exhaust valve
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)
Cycle: supercharged 4
No cylinders: 6 inline
Bore: 105 mm
Stroke: 115 mm
Displacement: 5970 cc
Ignition: Double magneto
Weight: 147 kg
Max pwr: 180 hp at 2750 rpm
Fuel consumption: 43 lt/hr