See:Given the lack of further details on this latter power unit, it is believed that it could be identified with the Alfa 101 RC80 engine that was under development at the time and for which a power output of 1,800 hp at 8,000 m was predicted for the basic version or 2,100 hp at the same altitude for the “maggiorato” version (presumably an improved version of the basic version).
https://oldmachinepress.com/2020/11/05/alfa-romeo-1101-28-cylinder-aircraft-engine/