Netflix is set to release a documentary specifically focused on the Harley-Davidson Milwaukee-Eight engine. While Netflix offers a variety of documentaries related to motorcycles and automotive topics, center exclusively on the Milwaukee-Eight engine.
The Milwaukee-Eight engine marks a significant milestone in Harley-Davidson’s storied history, representing the ninth generation of the company’s iconic “big twin” powerplants. Introduced in 2016, the engine is named for its notable configuration—eight valves in total, with four valves per cylinder. This design evolution plays a critical role in optimizing airflow and combustion, allowing for enhanced engine efficiency. As a result, riders benefit from improved throttle response, more robust power delivery, and a smoother, more refined ride when compared to earlier Harley-Davidson engines.
When it first hit the market, the Milwaukee-Eight was offered in two displacements: 107 cubic inches and 114 cubic inches. These engines were fitted into a range of Harley-Davidson touring and cruiser models. Later on, the lineup was expanded to include a 117 cubic inch version, available on select high-performance models. Not stopping there, Harley-Davidson’s performance division, Screamin’ Eagle, introduced a powerful upgrade—the Milwaukee-Eight 131 Performance Crate Engine. This high-performance option was designed to provide a dramatic increase in both torque and horsepower, catering to riders who seek maximum power and acceleration.
The Milwaukee-Eight stands out not only for its performance but also for its engineering refinements. One of its key innovations is the use of four valves per cylinder. This setup increases the volume of both incoming air and outgoing exhaust gases, significantly improving the engine’s ability to breathe. Better breathing directly translates to stronger performance and greater efficiency, which riders can feel in every twist of the throttle.
Another major improvement over previous Harley engines is the adoption of a single camshaft design. Traditional Harley V-twins often relied on dual camshafts, but the move to a single cam helps streamline the mechanical layout of the engine. This reduces overall complexity and weight, making for a lighter and more efficient machine.
To address rider comfort, Harley-Davidson incorporated counter-balancers into the Milwaukee-Eight engine. These internal components are specifically designed to minimize engine vibrations, a common concern among riders of large V-twin motorcycles. With the Milwaukee-Eight, the result is a ride that feels smoother and more stable—especially on long journeys where engine vibration can contribute to fatigue.
Temperature management was also a major focus in the design of the Milwaukee-Eight. Harley-Davidson introduced improved cooling systems, which include either precision oil cooling or liquid cooling, depending on the model. These systems are engineered to keep engine temperatures in check, even under heavy load or in hot weather conditions. This is a notable upgrade, as previous engine generations often struggled with heat buildup during extended use.
All of these changes work in harmony to deliver a more responsive and comfortable riding experience. Riders immediately notice the benefits in throttle control, smoother engine operation, and reduced heat emanating from the bike during rides. The Milwaukee-Eight engine reflects Harley-Davidson’s commitment to staying true to its heritage while also embracing modern engineering practices to meet the expectations of today’s riders.
The engine also helps Harley-Davidson stay competitive in a market that increasingly values both tradition and technological innovation. While it retains the classic V-twin sound and character that have long been associated with the brand, the Milwaukee-Eight introduces a level of refinement that appeals to both longtime Harley loyalists and a new generation of motorcyclists looking for performance and reliability.
In short, the Milwaukee-Eight engine is more than just a new motor—it’s a carefully designed piece of engineering that strikes a balance between tradition and modernity. With advancements like increased valve count, a simplified camshaft setup, integrated counter-balancers, and effective cooling technologies, the engine is a cornerstone of Harley-Davidson’s modern lineup. These upgrades collectively address many of the criticisms aimed at earlier engines while delivering a powerful, smooth, and enjoyable ride that meets the demands of today’s riders.
