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Colombo S. 53
1928 - anni '30



The S. 53 engine was designed and produced by the Officine Meccaniche Colombo of Milan, in 1928, for general aviation aircrafts. Subsequently the company was acquired by Alfa Romeo which continued the production of the engine up the 1930s.

Technical specifications

ManufacturerOfficine Meccaniche Colombo, Milan, Italy, from 1928 to 1930s
TypeS. 53
Descriptionaircraft engine with 4-inline cylinders, aluminium crankcase with 5 main bearings, steel-made cylinders, headd and pistons in aluminium alloy
Stroke140 mm
Bore114 mm
Displacement5710 cm³
Compression ratio5.24
Power94 hp at 1900 rpm at sea level
Specific fuel consumption230 g/hp/h
Specific power16.5 hp/litre
Valvetrain system2 overhead valves per cylinder, operated by pushrods and rocker arms controlled by a gear-driven camshaft housed in the crankcase
Fuel feeding systemwith one single-barrel gasoline carburetor Zenith 48 J 9, with an inlet mixture heater
Ignition systemwith two Marelli H4 spark plugs per cylinder fed by two Marelli SA4 magneto distributors
Cooling systemair-fed
Lubrication systemforced by a feeding gear pump and one scavenge gear pump
Weight105 kg
Mass-to-power ratio1.1 kg/hp


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Courtesy of the Technical High School Vittorio Emanuele III of Palermo.

Testi e immagini di Giuseppe Genchi
Sito realizzato da Pasquale Pillitteri