La Polymecanique was the builder of Motobecane motorcycles and made horizontally-opposed, twin-cylinder engines and a 5-cylinder radial.

-As it appears in this ad from the mid-twentieth century, towards the 1950’s.

“La Polymecanique ad”

-The twin cylinder with 2 opposed cylinders gave 38 CV. We show it from the front and from the back. It is the 2A1 model.

“The 38 CV engine”

“Polymecanique 2A1”

-The shape of the cylinders is characteristic and is maintained in the second engine that appears in 1938. This engine, the 5-cylinder radial model 5G1, was for use on aircraft and gave 90 CV.

"Polymecanique 5G1 5-cylinder"

-During the war, a 7-cylinder 115/125 CV (7G1) is presented without knowing if it was finished or what application it had. The 7G1 is shown below.

“Polymecanique 7G1”