Some typical Harley-Davidson engine sizes include the 88-cubic-inch Twin Cam 88, the 80-cubic-inch Evolution and the 74-cubic-inch Shovelhead. Some older Harley-Davidson motorcycles are equipped with either the 61- or 74-cubic-inch Panhead or Knucklehead engines.
The Knucklehead 1000cc engine, manufactured from 1930-1948, was the first of Harley-Davidson's overhead valve engines. The Panhead engine, produced from 1948 to 1965, had aluminum cylinder heads and boasted up to 1200cc of power. The Shovelhead engine, manufactured from 1965 to 1986, offered up to 1338cc of power. The Evolution 1340cc engine, produced from 1984 to 1999, was designed with an electronic ignition and a belt drive, and aimed at meeting modern-day emission standards, which is something for which the older engines were not equipped. In 1999, Harley-Davidson released the Twin Cam engine, which comes in sizes ranging from 88 to 110 cubic inches and 1450 to 1800cc, depending on the model. The Twin Cam engine is standard on most of the company's touring motorcycles, as of 2015.