SIA Ambrosini was established in Rome and built two types of engines, a horizontally-opposed four-cylinder and a horizontally-opposed two-cylinder.

“Ambrosini P.25”

-The two-cylinder P.25 was a two-stroke engine that gave 22 HP.

-The P.70 was a four-cylinder, four-stroke engine that gave 75 HP with a classic architecture.

“Ambrosini P.70”

-Ambrosini's full name was SAI Ambrosini, that is, “Societá Aeronautica Italiana Ambrosini”.