The Milwaukee-Eight 117 engine roars to life like a sleeping giant awakening from its slumber, embodying the spirit of American motorcycling. It's a powerhouse that's been engineered to deliver an unparalleled riding experience. With its impressive 117 cubic inch displacement and advanced cooling system, this engine isn't just about raw power—it's a demonstration of precision engineering and rider-focused design. From its optimized torque curve to its emissions compliance, the Milwaukee-Eight 117 offers a blend of performance and practicality that's hard to ignore. But there's more to this mechanical marvel than meets the eye.

Quick Takeaways

• Largest displacement in Harley-Davidson lineup at 117 cubic inches, delivering 127 lb-ft peak torque at 3750 RPM.
• Precision oil/air cooling system with Twin-Cooled™ option for enhanced performance and heat management.
• Dual counter-balancers minimize primary vibration, improving long-distance ride comfort.
• Meets 50-state emissions regulations while maximizing performance through advanced engineering.
• Features a high-performance camshaft and tuned heavy breather intake system for maximized airflow and efficiency.

Displacement and Power Output

The Milwaukee-Eight 117 engine boasts three key performance features that set it apart.

First and foremost is its impressive displacement of 117 cubic inches, making it the largest factory-installed engine in Harley-Davidson's lineup. This behemoth of an engine is designed to deliver raw, unbridled power to riders who crave the ultimate freedom on the open road.

Second, the Milwaukee-Eight 117's power output is nothing short of remarkable. With a peak torque of 127 lb. ft. at 3750 RPM, it provides riders with a surge of mid-range performance that's perfect for quick overtakes and exhilarating acceleration. This torque-rich engine empowers riders to break free from the constraints of ordinary riding experiences.

Lastly, the engine's design contributes considerably to its power output. The Milwaukee-Eight 117 features a bore of 4.075 inches and a stroke of 4.5 inches, coupled with a compression ratio of 10.2:1.

These specifications, combined with a high-performance camshaft and high-flow intake system, result in an engine that's not just powerful but also efficient. It's a demonstration of Harley-Davidson's commitment to pushing the boundaries of motorcycle engineering, offering riders an unparalleled sense of liberation on two wheels.

Advanced Cooling System

One of the Milwaukee-Eight 117 engine's most impressive features is its advanced cooling system. This precision oil/air cooling system is designed to enhance performance under challenging conditions, ensuring efficient heat management.

The Twin-Cooled™ design enhances thermal comfort by effectively reducing heat absorption while increasing heat rejection, allowing riders to break free from traditional cooling constraints.

The engine's cooling strategy specifically targets hot areas around the cylinder heads, maintaining ideal operating temperatures for improved reliability and comfort. This innovative approach empowers riders to push their machines to new limits without worrying about overheating.

A new knock sensor in the cooling system allows for precise timing control, further enhancing overall engine performance and efficiency.

In a move that demonstrates Harley-Davidson's commitment to rider liberation, the rear exhaust pipe has been repositioned to minimize heat exposure for passengers.

This thoughtful design change enhances the riding experience for both the rider and passenger, allowing them to focus on the thrill of the open road rather than discomfort from excessive heat.

The Milwaukee-Eight 117's advanced cooling system truly sets it apart, offering riders unparalleled performance and comfort.

Precision-Engineered Components

Building on its advanced cooling system, the Milwaukee-Eight 117 engine's precision-engineered components further elevate its performance. This powerhouse boasts a massive 117 cubic inch displacement, achieved through a carefully designed 4.075-inch bore and 4.5-inch stroke.

It's the largest factory-installed engine in Harley-Davidson's lineup, offering riders unparalleled freedom on the open road.

The engine features a high-performance camshaft and a tuned heavy breather intake system, maximizing airflow for enhanced mid-range torque and overall power delivery. This high flow design allows riders to release their full potential, breaking free from the constraints of lesser engines.

Harley-Davidson's engineers have incorporated dual counter-balancers to minimize primary vibration, greatly improving rider comfort during long journeys. The precision oil/air cooling system guarantees peak performance in challenging conditions, allowing riders to push their limits without compromise.

With a compression ratio of 10.2:1 and hydraulic self-adjusting lifters, the Milwaukee-Eight 117 delivers efficient power and requires minimal maintenance.

These precision-engineered components work in harmony to create an engine that's not just powerful, but also reliable and smooth, empowering riders to break free from the ordinary and embrace the extraordinary.

Torque Curve Optimization

Milwaukee-Eight 117's torque curve optimization sets it apart from its predecessors. The engine delivers a peak torque of 127 lb-ft at 3750 RPM, providing riders with a powerful surge of mid-range acceleration.

What's truly remarkable is the consistency of the torque curve, maintaining over 100 lb-ft from 2,700 to 4,900 RPM. This broad powerband guarantees riders have ample thrust available throughout the rev range, freeing them from the constraints of gear selection.

The Milwaukee-Eight 117 doesn't just improve upon its predecessor; it revolutionizes the riding experience. With a 5% increase in torque over the 114 model, this engine breaks free from conventional limitations.

The high-performance camshaft and tuned heavy breather intake optimize air flow, releasing the engine's full potential. Dual counter-balancers minimize vibration, allowing riders to fully embrace the raw power without compromise.

For those seeking liberation on two wheels, the Milwaukee-Eight 117 offers:

• Unparalleled mid-range acceleration for swift overtakes
• Consistent torque delivery for confident, responsive riding
• Optimized air flow for enhanced performance across the rev range

This engine empowers riders to break free from the ordinary and experience the thrill of unbridled power on the open road.

Emissions Compliance

Harley-Davidson's commitment to environmental responsibility shines through in the Milwaukee-Eight 117 engine's emissions compliance. This powerhouse V-Twin engine is engineered to meet 50-state emissions regulations, ensuring riders can express their freedom across the entire United States without compromising performance or breaking the law.

The Milwaukee-Eight 117 V-Twin engine showcases advanced engineering that minimizes emissions while maximizing performance. It's a demonstration of Harley-Davidson's dedication to both rider satisfaction and environmental stewardship.

The engine's precision oil/air cooling system and high-performance components work in harmony to reduce emissions without sacrificing the raw power that enthusiasts crave.

Dual counter-balancers not only enhance rider comfort by reducing vibration but also optimize combustion efficiency, further aiding emissions control.

For those seeking even more power, Harley-Davidson offers dealer-installed Screamin Eagle Performance Parts that maintain compliance with emissions regulations. This allows riders to push the boundaries of performance without crossing legal lines, embodying the spirit of rebellion within the confines of responsibility.

The Milwaukee-Eight 117 proves that emissions compliance and exhilarating performance can coexist, offering riders the best of both worlds.

Twin-Cooled and Oil-Cooled Compatibility

Two distinct cooling configurations cater to diverse rider preferences in the Milwaukee-Eight 117 engine. The Twin-Cooled™ and oil-cooled options offer riders the freedom to choose the system that best suits their riding style and environment.

The Twin-Cooled™ configuration employs liquid cooling for the cylinder heads, enhancing thermal management and overall efficiency. This advanced system allows riders to push their machines to the limit without compromising performance.

For those who prefer a more traditional approach, the oil-cooled version of the Milwaukee-Eight engine delivers ideal temperature control through a robust oil circulation system.

Both configurations share the engine's high-performance design, featuring dual counter-balancers that minimize vibration and guarantee rider comfort.

The Milwaukee-Eight 117 engine's versatility extends beyond cooling options:

• Compatibility with various stage kits for further customization
• Consistent performance across both cooling configurations
• Adaptability to different riding conditions and preferences

This flexibility empowers riders to break free from conventional limitations and tailor their machines to their unique desires.

Whether opting for the cutting-edge Twin-Cooled™ system or the tried-and-true oil-cooled version, enthusiasts can experience the full potential of the Milwaukee-Eight 117 engine while maintaining their individuality on the open road.

Performance Enhancements

Power-packed enhancements define the Milwaukee-Eight 117 engine, setting it apart from its predecessors. This beast of an engine delivers a jaw-dropping 126 lb. ft. of torque at 3750 RPM, releasing a 5% increase over its Milwaukee-Eight 114 counterpart. Riders craving liberation on the open road will find their thirst for power quenched by this formidable powerplant.

The Milwaukee-Eight 117's performance enhancements are engineered to ignite the soul of freedom-seekers. A high-performance camshaft works in tandem with a tuned heavy breather intake, maximizing airflow and amplifying mid-range torque delivery. This combination guarantees riders experience an exhilarating surge of power with every twist of the throttle.

With a compression ratio of 10.2:1, the engine's responsiveness is taken to new heights, allowing riders to break free from the constraints of ordinary riding experiences.

The incorporation of dual counter-balancers notably reduces primary vibration, providing a smoother ride without compromising the raw, unbridled feel of the machine. Whether cruising leisurely or pushing the limits, the Milwaukee-Eight 117's instant acceleration and razor-sharp throttle response empower riders to embrace the spirit of rebellion and adventure on two wheels.

Rider Comfort Features

Four key rider comfort features distinguish the Milwaukee-Eight 117 engine, making it a standout choice for long-distance riders. The engine's dual counter-balancers greatly reduce primary vibration at idle and during operation, enhancing overall comfort for extended journeys.

A redesigned exhaust system minimizes heat exposure for passengers, while precision cooling targets hot spots around cylinder heads, improving thermal comfort for both rider and passenger.

The Harley-Davidson Milwaukee-Eight 117 also boasts a reduced idle speed of 850 RPM, down from 1,000 RPM, decreasing engine noise and vibrations. This, combined with the slim primary drive cover and low-profile air cleaner design, creates a more relaxed riding position with improved rider legroom.

These comfort-focused features offer riders:

• Liberation from fatigue during long rides
• Enhanced control and connection with the machine
• A more immersive and enjoyable riding experience

The Milwaukee-Eight 117's emphasis on rider comfort demonstrates Harley-Davidson's commitment to evolving their iconic engines. By addressing key comfort issues, they've created a powerplant that not only delivers impressive performance but also guarantees riders can fully embrace the freedom of the open road without compromise.

Common Questions

Is the Milwaukee 8 117 a Good Engine?

The Milwaukee-Eight 117 is widely considered an excellent engine.

It's a powerhouse that delivers impressive torque and acceleration, giving riders the freedom to conquer the open road with confidence.

Its smooth operation, thanks to dual counter-balancers, enhances the riding experience.

While it's thirsty for high-octane fuel, it offers a respectable fuel economy.

What Is the Difference Between the M8 114 and 117?

The M8 117 packs a bigger punch than its 114 sibling, boasting increased displacement and power.

It's got a beefier 117 cubic inch capacity, churning out 5% more torque at 127 lb. ft.

The 117's high-performance cam and intake are tuned for mid-range muscle, while its higher compression ratio gives it an extra edge.

Both engines share similar valve setups, but the 117's optimized for better airflow and power delivery, making it the choice for riders craving more oomph.

How Much Horsepower Does a 117 Milwaukee 8 Have?

Imagine roaring down the open road, feeling the raw power beneath you.

That's the Milwaukee-Eight 117 engine, breaking free from old constraints. It's packing a rebellious 101 horsepower at 4,850 RPM, releasing riders' potential for freedom.

But it's not just about peak power – this beast keeps churning out over 90 HP from 4,600 to 5,750 RPM.

With its dual spark plugs and improved design, it's a game-changer that's redefining what's possible for those who crave liberation on two wheels.

What Is Different About the Milwaukee 8 Engine?

The Milwaukee-Eight engine breaks free from its predecessors, offering riders a revolutionary experience.

It's got dual counterbalancers that crush vibrations, giving a smoother ride. The engine's high-flow intake and performance camshaft release quicker throttle response and beefier mid-range torque.

It's not just about power; it's about comfort too. Advanced cooling tech targets hot spots, keeping riders cool.

With a 10% torque boost and improved efficiency, it's a liberating upgrade for Harley enthusiasts.

Wrapping Up

The Milwaukee-Eight 117 engine stands as a beacon of power and innovation in the motorcycle world. It's a steel stallion, galloping through the streets with its 117 cubic inches of raw displacement. The Twin-Cooled™ technology acts as a cool breeze, taming the beast within. With its precision engineering and rider-friendly features, this engine isn't just a heart; it's the soul of the machine, promising an exhilarating journey on the open road.