They were adapted Plymouth car engines from Chrysler Motors. It started its march in 1928.

“Plymouth logos”

-With vertically upright in-line cylinders, it required a front radiator to cool the water.

“Dos Plymouth”

-It gave 80 HP, weighed 500 lb and was installed in the Plymouth Coupe SF1 and SF2 cars.

“Plymouth reduction gear”

-The engine modifications to adapt it to an airplane were made by the Fahlin Aircraft Company.. The magnetos were Vertex-Scintilla and the compression could be from 6.7 to 1 or from 7 to 1.

-Maximum power was obtained with the crankshaft rotating at 3,600 rpm while the propeller did so at 1,800 rpm.