With this compound name, the engine is practically the same as the one in the Perfetti chapter.

-But there are two engines with the same style and name, one giving 300 CV and the other with 450 CV.

“Perfetti-Dollara, 300 CV”

In this bare motor group we can perfectly observe the oscillating plate and the nine cylinders around the propulsion shaft.

-The plate is pushed by the pistons' rigid connecting rods in such a way that they make it slide, producing rotation.

-It has slight improvements, above all by the application of a second magneto. Both powers are obtained at 1,500 rpm.

From Appendix 12: A new illustration of the 300 hp barrel -or revolver- engine.

"Perfetti-Dolara, 300 CV, more detailed" (PiP-Flu)