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Overhead valve, V-twin engine
- This overhead valve, V-twin engine got its nickname from the distinct shape of its rocker covers, which resemble two clenched fists with protruding knuckles. The Knucklehead was a significant technological advancement for Harley-Davidson, as it was their first production motorcycle to feature overhead valves.
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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. [1] The engine is a two-cylinder, 45 degree, pushrod actuated overhead valve V-twin engine with two valves per cylinder.
- A Brief History of The Knucklehead Engine
- Motorcycles That Used The Knucklehead Engine
- Interesting Facts About The Knucklehead Engine
- The Legacy of The Knucklehead Engine
The Knucklehead engine, officially known as the Harley-Davidson EL, was introduced by Harley-Davidson in 1936. This overhead valve, V-twin engine got its nickname from the distinct shape of its rocker covers, which resemble two clenched fists with protruding knuckles. The Knucklehead was a significant technological advancement for Harley-Davidson, ...
The Knucklehead engine was primarily used in the Harley-Davidson EL and FL series of motorcycles. The EL model, also known as the “61,” was introduced in 1936 and featured a 61-cubic inch (1,000 cc) engine. In 1941, the FL model, also known as the “74,” was introduced with a larger 74-cubic inch (1,200 cc) engine. These bikes were popular among rid...
The Knucklehead engine was initially designed by Harley-Davidson engineers Joe Petrali and Bill Ottaway. They were inspired by the overhead valve engines used in aircraft.The Knucklehead engine played a crucial role in Harley-Davidson’s success during World War II. The military version of the motorcycle, the XA, used the Knucklehead engine to power thousands of bike...The Knucklehead engine is considered one of the most iconic and collectible motorcycle engines. Original Knucklehead-powered motorcycles are highly sought after by collectors and restored or origin...The Knucklehead engine’s unique design has inspired several custom motorcycle builders, such as Indian Larry, who often used Knucklehead engines in their custom builds.The Knucklehead engine holds a special place in the hearts of motorcycle enthusiasts, not just for its distinctive appearance but also for its historical significance. It marked a turning point for Harley-Davidson and set the stage for the company’s future innovations. Today, the Knucklehead engine serves as a reminder of Harley-Davidson’s rich his...
Aug 25, 2023 · The Knucklehead engine pioneered the engine layout that exists to this day in the modern Harley-Davidson Milwaukee 8 engine. Related: Win a 1937 Harley Davidson Knucklehead With Wheels Through...
- Motorcycle Writer
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. The engine is a two cylinder, 45 degree, pushrod actuated overhead valve V-twin engine with two valves per cylinder.
Jun 27, 2024 · In the mid-1930s, Harley-Davidson introduced the Knucklehead engine, named for its distinctive rocker boxes resembling clenched fists. This groundbreaking design featured overhead valves, a departure from the side-valve configuration prevalent at the time.
The Shovelhead and Knucklehead are two iconic engine designs from Harley-Davidson, each representing distinct eras in motorcycle engineering. The Knucklehead, introduced in 1936, was a transformative design that established Harley as a major influence in the motorcycle industry.
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.
