By 1921 the Benjamin car brand presents three new engines for aviation. They were 8-cylinder V engines without gear and its cylinders were grouped in pairs.

-They were the MJ-5 that gave 350 CV at 1400 rpm and had the V at 65° while the MJ-6 and MJ-7 had the cylinder V at 90°.

-The MJ-6 delivered 450 CV and the MJ-7, reached 700 CV. The Benjamin factory is also known as “Amual”.