• Source: Walter Minor

The Walter Minor is a family of four- and six-cylinder inverted inline air-cooled engines, developed under auspices of ing. Šimůnek and used on light aircraft. First produced in 1929, the Minor engines' family has an advanced design for the period and sports steel cylinders, aluminum heads and overhead valves, with identical bore and stroke of 105 mm (4.1 in) and 115 mm (4.5 in), respectively. Typical power ratings varied from 105 to 160 hp (78 to 119 kW).
After Walter concentrated on the turbine powerplants only, the production of piston engines has been transferred to the Avia company that further developed the family, bringing fuel injection, as the Avia M-137 and M-337. Nowadays the smallest of the family, the four-cylinder carburetted Minor, is produced by a small company in the Czech Republic, while the M337 was available from the LOM Prague.




Variants






= 4 Cylinder

=
Minor 4-I

Minor 4-II

Minor 4-III

Minor 4-IIIS
A 4-III fitted with a crankshaft driven supercharger.
Minor M 332 (4 cyl.)




= 6 Cylinder

=
Minor 6-I

Minor 6-II

Minor 6-III

Minor 6-IIIS
A 6-III fitted with a crankshaft driven supercharger.
Minor M 337 (6 cyl.)




= Others

=
Minor Sc.




Applications






Specifications (Minor 4-cylinder)



Data from: Oldengine.org




= General characteristics

=
Type: 4-cylinder inverted inline air-cooled
Bore: 105 mm (4.14 in)
Stroke: 115 mm (4.53 in)
Displacement: 4 L (244 cu in)
Length: 1,119 mm (44.09 in)
Width: 440 mm (17.32 in)
Height: 630 mm (24.80 in)
Dry weight: 93 kg (205 lb)




= Components

=
Valvetrain: 1 inlet and 1 exhaust valve per cylinder
Fuel system: 1 Claudel carburetor
Fuel type: 68 octane
Cooling system: Air-cooled




= Performance

=
Power output: 95 hp (71 kW) at 2,550 rpm
Compression ratio: 5.3:1
Power-to-weight ratio: 0.76 kW/kg (0.46 hp/lb) at cruise power




See also



Comparable engines

Argus As 8
Blackburn Cirrus Minor
de Havilland Gipsy Minor
Related lists

List of aircraft engines




References



"National Technical Museum, Prague". Retrieved 8 July 2013.
Gunston, Bill. World Encyclopedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989. ISBN 1-85260-163-9
Oldengine.org




External links

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