The CNA C.VI I.R.C.43 was a six-cylinder, supercharged, inverted, inline engine designed and built in Italy in the 1930s.
Following standard Italian practice, the designation IRC43 indicated that the engine was inverted, geared down and had a supercharger rated to 4,300 m (14,110 ft).
[1]
Data from Italian Civil and Military Aircraft 1930-1945[2] Data from Jane's All the World's Aircraft 1938[1]