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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.
Aug 25, 2023 · The Model 61E with the Knucklehead engine was a huge step forward for Harley-Davidson. Increased power was the most obvious benefit, but the gearbox was now a constant-mesh unit, which was ...
Aug 18, 2016 · The H-D Knucklehead V-twin was introduced in 1936. Here’s a look at the technical evolution of the 61-cu.-in. engine and chassis of Harley-Davidson’s first OHV Big Twin.
Dec 13, 2023 · The Harley-Davidson Knucklehead engine replaced the cheaper and simpler flathead engines, offering more power and better performance. The Knucklehead engine was ahead of its time in design and technology, featuring innovations such as a dry sump, mechanical oil pump, and better air and fuel flow.
The Harley Davidson Knucklehead is a retronym referring to an engine blueprint produced by the American OEM from 1936 to 1947. This power mill had a piston displacement of 997—1,210 cm 3 (61—74 ci), spewed 36—53 hp (26.8—39.5 kW), and was the forerunner of the Panhead and Shovelhead engines.
Aug 7, 2020 · The first engines built had problems with valve spring breakage, poor rocker arm lubrication and leakage of oil from the top end. Spring metallurgy was improved, rockers redesigned, and repair kits were sent out to dealers to fix the over 1000 affected new bikes already on the road.
Dale's Wheels Through Time Museum, located in Maggie Valley, NC, features over 375 American motorcycles, unique cars, and transportation history.For more inf...
Nov 14, 2016 · Harley-Davidson had been unable to use cast integral rocker boxes on this new OHV engine because that technology had been patented by aircraft engine maker Pratt & Whitney. So they had attempted to use separate rocker boxes bolted to the head.
Nov 10, 2014 · The 61 cubic-inch E, ES and EL Harley-Davidson models ushered in the transition from the long-serving but under-powered side-valve flathead V-twin engine to the higher tech and higher powered...
The Knucklehead provided vastly increased horsepower and durability, and became the bedrock of Harley-Davidson engine design for the next 65 years. The Knucklehead was the heart of a boldly redesigned and reengineered cycle, the revolutionary Model E.
