Franklin 4-cylinder automobiles were notable in the brand's history for their innovative engineering, especially with the use of air-cooled engines. These cars were introduced in 1902 with manual transmissions and power sent to the rear wheels. The inline four engines ranged from 1.7L up to 4.0L in displacement. Notable variants include the Model A, Model G and Type E. These early four cylinder Franklin cars were produced until 1912.