The Alfa Romeo D2 was a nine-cylinder radial engine for aircraft use produced in Italy. It was typically rated between 240-270 hp.
The engine was designed by Vittorio Jano

Vittorio Jano

Vittorio Jano was an Italian automobile designer of Hungarian descent from the 1920s through 1960s.Jano was born Viktor János in San Giorgio Canavese, in Piedmont, to Hungarian immigrants, who arrived there several years before the birth of Jano. He began his career at the car and truck company...

and produced 600 units between 1931-1934. This engine was also first purpose-built aircraft engine produced by Alfa Romeo, before it all Alfa engines used in airplanes were derived from engines used in cars.