The "motorjet" that Uno Campini developed to propel the C.C.4 is substantially different from the jet engines of today and his engine used a conventional piston engine to compress air.
The Caproni Campini N.1, also known as the C.C.2, was an experimental jet aircraft built in the 1930s by Italian aircraft manufacturer Caproni. The engine of the N.1 featured a radical design, differing substantially from the later-produced turbojet and turbofan engines. 
