Harley-Davidson Knucklehead engine: Difference between revisions

The '''knucklehead''' is a [[retronym]] used by enthusiasts to refer to a [[Harley-Davidson]] [[motorcycle]] [[engine]], so named because of the distinct shape of the [[rocker boxes]].<ref>{{cite web|url=http://www.motorcycleclassics.com/motorcycle-reviews/1977-harley-davidson-custom-flhs.aspx|title=1977 Harley-Davidson custom FLHS|publisher=Motorcycle Classics|accessdate=2009-08-18|date=November–December 2005|author=Margie Siegal}}</ref> The engine is a two -cylinder, 45 degree, pushrod actuated [[overhead valve]] V-twin engine with two valves per cylinder. It was the third basic type of V-Twin engine used by Harley-Davidson, replacing the Flathead-engined VL model in 1936 as HD's top-of-the-line model. The engine was manufactured until 1947 and was replaced by the [[Panhead]] engine in 1948. The Knucklehead-engined models were originally referred to as "[[Overhead valve|OHV]]s" by enthusiasts of the time and in Harley's official literature; the nickname arose from the California chopper culture of the late 1960s.