Hudson Super Six engine

The Hudson Super Six was the straight-six engine that the Hudson Motor Car Company of Detroit introduced in January 1916 in the car of the same name, also called the Series H. Its inline six displaced 288.5 cubic inches, about 4.7 litres, and developed 76 horsepower, against 40 horsepower from the equally sized engine of the contemporary Model Six-40. The gain came from a crankshaft with integral counterweights, designed by Hudson engineer Howard E. Coffin, which tamed the internal vibration that limited early engines and let the Super Six turn at up to 3,400 rpm, nearly double the speed of its contemporaries. It was the first engine Hudson built itself, after earlier Hudson designs had been manufactured by Continental Motors. Hudson redesigned the engine for 1927 with an F-head and 92 horsepower, and when Hudson cars went to eight cylinders in 1930 the Super Six name carried on in Essex models. The articles read for this entry do not state its fuel.