Author(s): Greg Field
Celebrate the 80th anniversary of the engine that changed the motorcycle world.Motorcycle technology lagged far behind automotive technology since the earliest days of the internal-combustion engine. All that changed in 1936 when Harley-Davidson introduced the Model EL. For the first time ever, a company was manufacturing a high-performance overhead-valve engine for the masses.And what an engine it was; in addition to bringing state-of-the-art technology to the motorcycling world, the engine itself was a work of art. Because of the shape of its rocker covers, the engine was given a nickname to match its looks: the Knucklehead. The technology used in this engine was so advanced that it laid the foundation for every future Harley-Davidson motorcycle, including the current models built in the 21st century. To this day every cruiser style motorcycle still adheres to the shape of that original Knucklehead."Harley-Davidson Knucklehead: 80 Years" tells the entire Knucklehead story, from the very first overhead-valve V-twin Harley produced for the public through the post-war models, continuing right up until today, when aftermarket manufacturers reproduce complete Knucklehead crate engines because of its continuing popularity.
Greg Field has written a number of books on the subject of motorcycles, including several volumes dealing with Harley-Davidson, including "Harley-Davidson Knucklehead," "Harley-Davidson Panhead," "Harley-Davidson Century," "Harley-Davidson Evolution Motorcycles," "Harley-Davidson Softail," "Original Harley-Davidson Knucklehead," and "Original Harley-Davidson Panhead." Most recently he contributed several chapters to "Harley-Davidson Motorcycles: A Complete History."