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   What is a knucklehead engine?

   • 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.

   Harley-Davidson Knucklehead engine - Wikipedia

   en.wikipedia.org/wiki/Harley-Davidson_Knucklehead_engine

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   What is a Knucklehead motorcycle?

   • The Knucklehead, introduced in 1936, was a transformative design that established Harley as a major influence in the motorcycle industry. Its innovative overhead valve design and distinctive knuckle-shaped rocker boxes set a new standard for power and reliability.

   Shovelhead Vs Knucklehead [Ultimate Comparison] - Two Wheller

   www.twowheller.com/shovelhead-vs-knucklehead/

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   Why did the next Harley-Davidson have a knucklehead engine?

   • More speed needs more power and more power creates more heat, which is something the all-iron Knucklehead engine didn’t need and couldn’t cope with. Thus, the next Harley-Davidson engine had iron barrels but aluminum cylinder heads, complete with a rocker cover that resembled an up-turned cooking pan.

   The Harley-Davidson Knucklehead Engine: Everything You Need To Know

   www.topspeed.com/the-harley-davidson-knucklehead-engine-everything-you-need-to-know/

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   What is the difference between Knucklehead and Shovelhead engines?

   • Each engine brought its unique innovation to the table. The Knucklehead introduced overhead valves, the Panhead aimed to improve oil containment, and the Shovelhead offered increased power for heavier motorcycles. How Is Aftermarket Support For These Engines?

   Shovelhead vs Panhead vs Knucklehead (Trip Through Time)

   theseasonedwrench.com/shovelhead-vs-panhead-vs-knucklehead/

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   Are Knucklehead motorcycles worth a premium price?

   • Original Knucklehead-powered motorcycles are highly sought after by collectors and restored or original bikes can fetch a premium price at auctions. 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.

   What is a Knucklehead Motorcycle? | Biker Report

   biker.report/what-is-a-knucklehead/

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   What is the difference between a Knucklehead and a panhead engine?

   • Each engine has a distinct aesthetic that reflects its era. Knuckleheads have a classic, vintage look with their iconic knuckle-shaped rocker covers. Panheads are recognizable by their flat, pan-like rocker cover design.

   Shovelhead vs Panhead vs Knucklehead (Trip Through Time)

   theseasonedwrench.com/shovelhead-vs-panhead-vs-knucklehead/

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2. en.wikipedia.org › wiki › Harley-DavidsonHarley-Davidson Knucklehead engine - Wikipedia

   en.wikipedia.org › wiki › Harley-Davidson

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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.

3. www.topspeed.com › the-harley-davidson-knuckleheadThe Harley-Davidson Knucklehead Engine: Everything You Need ...

   www.topspeed.com › the-harley-davidson-knucklehead

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   Aug 25, 2023 · The Knucklehead was one of the first modern motorcycle engines ever produced, and provided a foundation for Harley-Davidson to build upon.

   • Occupation: Motorcycle Writer

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5. motorcyclehorizon.com › what-is-a-knuckleheadWhat makes the Knucklehead motorcycle engine a timeless ...

   motorcyclehorizon.com › what-is-a-knucklehead

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   Jun 27, 2024 · Knucklehead motorcycle engines were revolutionary in the 1930s, featuring overhead valves for enhanced power and efficiency. The distinctive design of knucklehead engines, with rocker box covers resembling clenched fists, made them iconic in motorcycle culture.

6. www.twowheller.com › shovelhead-vs-knuckleheadShovelhead Vs Knucklehead [Ultimate Comparison] - Two Wheller

   www.twowheller.com › shovelhead-vs-knucklehead

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   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.

7. Videos

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     1936 Harley-Davidson Knucklehead - Jay Leno's Garage

     4 May 2015

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     1947 Harley Davidson FL Knucklehead Running

     29 May 2015

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     Check out this freshly restored 1936 Harley-Davidson Knucklehead!

     19 Dec 2023

     11.1K views

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8. theseasonedwrench.com › shovelhead-vs-panhead-vsShovelhead vs Panhead vs Knucklehead (Trip Through Time)

   theseasonedwrench.com › shovelhead-vs-panhead-vs

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   Dec 11, 2023 · Originally referred to as “OHV” (Overhead Valve), the Knucklehead was the first Harley-Davidson engine to place the valves at the top of the cylinder, controlled by rockers contained within the cylinder head.

9. bigbikereviews.com › harley-knuckleheadHarley Davidson Knucklehead Engine Review - Big Bike Reviews

   bigbikereviews.com › harley-knucklehead

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   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 cm3 (61—74 ci), spewed 36—53 hp (26.8—39.5 kW), and was the forerunner of the Panhead and Shovelhead engines.

10. biker.report › what-is-a-knuckleheadWhat is a Knucklehead Motorcycle? - Biker Report

    biker.report › what-is-a-knucklehead

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    Mar 27, 2023 · Discover the iconic Knucklehead motorcycle engine, its history, the Harley-Davidson models it powered, and fascinating facts about this classic V-twin.