in october 1936, with several thousand "salmson s4 "s sold over the previous two years, the manufacturer used the motor show to launch a further upgrade. the four-cylinder engine retained its twin overhead camshafts, and the length of the piston stroke was unchanged, but a further increase in cylinder bore (diameter) provided for a further increase in capacity, now to 1731 cc. the cylinder head now featured hemispherical piston heads and centrally positioned spark plugs, which gave the engine a level of responsiveness not normally associated with a 10cv engine. the car shared its place in the 10cv tax band with the recently introduced peugeot 302. where comparably bodied versions existed, however, the salmson s4 da was nevertheless priced approximately 50% higher than the peugeot 302: there was evidently no need for salmson to compete on price with the volume automakers.