The History of Harley-Davidson’s V-Twin Engine (And All Its Nicknames)
Harley-Davidson’s identity is inseparable from its V-twin engine, a design that has defined the brand’s sound, character, and legacy for over a century. The story begins in 1909 with the company’s first V-twin, the 49.5-cubic-inch Model 5-D, a 7-horsepower atmospheric-valve…