Alfa Romeo 125

Jupiter, 125, 126, 127, 128, 129 and 131
A 610 kW (820 hp) Alfa Romeo 128 R.C.18 from ca1939.
Type	Piston aircraft engine
Manufacturer	Alfa Romeo
First run	1930s
Major applications	Savoia-Marchetti SM.79
Number built	~11,000

Alfa Romeo built/designed a range of aircraft engines based on the Bristol Jupiter and Bristol Pegasus designs, designated Alfa 125, Alfa 126, Alfa 127, Alfa 128, Alfa 129 and Alfa 131. All these essentially similar engines were mainly fitted to Italian bombers in World War II, Alfa Romeo building around 11,000 units between 1934 and 1944

Alfa Romeo adapted the Jupiter / Pegasus (which are very closely related) to metric measurements, local materials and indigenous equipment.

(The Italian engine designation system includes a suffix indicating major components or attributes. The most common were R for Riduttore - reduction gear and C for Compressore - compressor/supercharger, followed by a number indicating the rated altitude in hundreds of metres, two speed superchargers were indicated by a double figure such as 10/34).

Data from Aircraft Engines of the World 1945 Archivio Storico Alfa Romeo - Volume II

Notes

Bibliography

...
Wikipedia