Franklin 6-cylinder automobiles were notable in the brand's history for their innovative engineering. These cars were introduced in 1914 with manual transmissions and power sent to the rear wheels. The inline six engines ranged from 3.3L up to 4.5L in displacement. These engines constantly evolved, increasing the displacement and refining their design, always maintaining the brand's philosophy based on air cooling and aerodynamics. Notable variants include the 11A, 11B, 10C and 12B. These six cylinder Franklin cars were produced until 1934 when the brand stopped producing automobiles and declared bankruptcy due to the Great Depression and the decline in demand for luxury cars.