The Packard Single Six is a series of 6-cylinder cars that the Packard Motor Car Company in Detroit in the model year made ​​1921 to 1924.

Packard introduced after the 1913 six-cylinder models in 1915 in favor of the model Twin Sixgave the twelve-cylinder engine, it was decided in 1921, again a more economical alternative to the big car introduce.

The car had a six-cylinder engine with side-side valves, 3,957 cc (bore x stroke) = 85.7 mm × 114.3 mm) and an output of 52 bhp (38.2 kW) at 2400 rpm. The design of the engine leaned against the Packard in the First World War developed Liberty to aircraft engines. A seven disk oil-bath clutch, the engine power to a manual three-speed transmission, and from there to the rear wheels has been forwarded. The mechanical brakes acted only on the rear wheels.

Gave the Single Six is ​​only on a chassis with 2946 mm wheelbase. It was an open, 5-seater tourer, an open 2-seater runabout, a 5-seat sedan or a 4-seater coupe to be built.

In 1922, the model has been completely redesigned: The engine received a stroke of 127 mm, so that the displacement was 4398 cc. This resulted in 54 bhp (39.7 kW) at 2.700/min.The clutch had nine discs to transfer the greater engine power safely. There were chassis with 3,200 mm or 3,378 mm wheelbase and wide range of bodies with two to seven seats.

The models were called by their wheelbase in inches, ie 1921/1922 as a model 116 and 1922/1923 as the models 126 and 133 They formed together with the model Single Eight of 1924 the first Series, a numbering system which was continued until 1953 (26 series).

1924, six months after the introduction of the Single Eight, a new Single Six was introduced.He combined technology and extent of the 1923er Single Six with the new achievements of the Single Eight: four-wheel brakes and manually operated windshield wiper. The following year the model was Packard Six renamed. Overall, in four years created 46,585 Single Six.