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LOM M132/332 engine

A short history of the Walter / LOM aircraft engines

Beginning with the production of cars and motorcycles, the Walter company was founded in 1896 and got into the manufacturing of aircraft engines after W.W. 1. It quickly became the major aircraft engine manufacturer in the newly established state of Czechoslovakia. Walter produced a number of models of radial engines of their own design and in 1932 introduced their first inline inverted engine, the four cylinder Walter Junior. The Mikron, Minor and Major followed, and eventually the Sagitta.

After W.W. II Walter re-started production of their inline inverted engines. However, except for the names, there were almost no similarities with their pre-war predecessors. The new Walter Mikron III (65 HO), Minor 4-III (105 HP) and Minor 6-III (160 HP) were actually engines newly designed by Ing. Bohumil Simunek. Over 1800 of the Minor 4-III, and 1300 of the Minor 6-III were built between 1946 and 1958. Both engines were used in several different airplanes, including such world renown acrobatic planes as the Zlin, where they proved to be excellent engines.

In 1959 a new Simunek's engine, the M332, got into production. Even though the M332 has a number of identical parts with the Minor 4 III engine, it should be considered a new design. It has an OHC, new pistons, cylinder heads and, the primary difference, is the supercharger and fuel injector. The power of the M332 was raised to 140 HP, in comparison with the Minor’s 105 HP. But the weight was increased by only 4 lbs!

The M332 engine and the six cylinder M 337 and M 137 are not produced by Walter anymore. The AVIA Co. took over production of these engines in 1959 and made them until 1990. At that time LOM (Letecke Opravny Malesice or Air Repair Malesice) obtained the manufacturing rights and currently are producing M 332, M 337 and M 7 engines. LOM also has a long history of overhauling various piston and jet engines including the making of spare parts or even whole engines. LOM also makes wooden fixed pitch propellers and is currently testing prototypes of in-flight adjustable propellers.

PICTURES

  1. VIEW OF LOM M332 INSTALLATION - HATZ CB-1, COWL-OFF
  2. VIEW OF LOM M332 INSTALLATION, HATZ CB-1, COWL-ON
  3. M132 ENGINE DRAWING
  4. M332 ENGINE DRAWING and PERFORMANCE CHARTS

TECHNICAL SPECIFICATIONS

	


     

    
M 132


    
 M 332


    
No. of cylinders




    
4




    
4





    
Low weight of




    
1.7 lb/HP




    
1.6 lb/HP








    
Frontal area




    
2.1 sq. ft




    
2.1 sq. ft





    
Bore (Inches)




    
4.13




    
4.13








    
Stroke (inches)




    
4.53




    
4.53





    
Displacement (Cubic Inches)




    
242.8




    
242.8








    
Compression Ratio




    
6.3:1




    
6.3:1





    
Propeller Drive




    
direct




    
direct








    
 Performance (HP/ RPM)

    * Take-Off	         	

    * Cruise	   




    
120 / 2700

100 / 2400




    




    
140 / 2700

120 / 2400





    
Fuel Consumption (US GaL/HR)

    * Cruise 2400 RPM




    
7.1




    
7.6








    
Recomended Fuel (Oct.)




    
78 or 100 LL




    
78





    
Crankshaft Rotation




    
ctclockwise




    
ctclockwise








    
TBO (Hrs)




    
2000




    
2000





    
TBO AKModel (Hrs)




    
1400




    
1400








    
Dry Weight (Lbs.)




    
246 to 255




    
263 to 273





     

     

     





Engine suffix codes











  
Note: Permissible G-load is the same for all models of LOM

  engines.


  Prohibition of "snap" manoeuvers is in effect for all

  models of LOM engines, except engineM-137A and M-137AZ.












LINKS TO LOMS














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