Surging with power and precision, the 1959 Harley-Davidson KR750 housed a side-valve 45 cubic inches V-twin engine that propelled this beast to remarkable speeds.
But, did you know that this engine's design was revolutionary for its time, setting a new standard in motorcycle engineering?
Unravel the mysteries behind this iconic engine and discover the secrets that made it a legend in the world of racing.
Key Takeaways
- The 1959 Harley Davidson KR750 featured a 45 cubic inch V-twin engine with 46 HP.
- Equipped with a modified M54 Linkert carburetor for enhanced performance.
- Utilized a magneto ignition system for reliability on the track.
- Integrated a unit-construction 4-speed gearbox for smooth gear shifts.
Evolution of the KR750 Engine
The evolution of the KR750 engine can be traced through significant advancements in design, performance, and technological innovation over the years.
In 1959, the Harley-Davidson KR750 stood as an AMA Grand National Champion with its formidable side-valve V-twin engine. This powerplant, with its 45 cubic inches (750cc) displacement, was a marvel of its time.
The KR750 engine boasted a modified M54 Linkert carburetor that contributed to its optimal performance, ensuring that power delivery was smooth and efficient. The ignition system, fueled by a magneto setup, added to the reliability and race-readiness of the engine. Paired with a unit-construction 4-speed transmission, this engine produced an impressive 46.0 HP (33.6kW) at 6500 RPM.
Such power allowed the 1959 KR750 to achieve a top speed of 177.0 km/h (110.0 mph), solidifying its place as a champion on the track. The 1959 model marked a significant milestone in the evolutionary journey of the legendary KR750 engine.
Key Features of the 1959 Engine
Exemplifying technological prowess and performance excellence, the 1959 Harley-Davidson KR750 engine showcased a blend of precision engineering and innovative design features. The side-valve V-twin engine, a hallmark of the KR750, boasted a displacement of 45 cubic inches (750cc), delivering power through a modified M54 Linkert carburetor for optimal fuel-air mixture. With a magneto-powered ignition system ensuring reliable spark generation, this engine was a marvel of its time. The unit-construction 4-speed gearbox facilitated seamless gear shifts, enhancing the rider's experience on the road. Below is a breakdown of the key features of the 1959 engine:
| Feature | Description |
|---|---|
| Engine Type | Side-valve V-twin engine |
| Carburetor | Modified M54 Linkert carburetor |
| Ignition System | Magneto-powered for reliable spark generation |
In 1959, the Harley-Davidson KR750 engine stood as a testament to the brand's commitment to innovation and performance, earning its place in the AMA Motorcycle Hall of Fame.
Performance Specifications Overview
Nestled within the heart of the 1959 Harley-Davidson KR750 lies a powerhouse of performance specifications waiting to be uncovered. Let's delve into the numbers that made this motorcycle a legend in the world of road racing:
- Powerful Engine: The KR750 boasted a 45 cubic inches V-twin side-valve engine, delivering a robust power output of 46.0 HP at 6500 RPM. This power allowed it to compete at the national level with remarkable agility.
- Impressive Speed: With a top speed of 177.0 km/h, or 110.0 mph, the KR750 showcased its capability to push boundaries on the racetrack. Its speed capabilities caught the attention of many enthusiasts and professionals alike.
- Optimized Performance: Weighing in at 163.3 kg, the KR750 had a power-to-weight ratio of 0.2817 HP/kg, a crucial factor in its exceptional performance. Paired with a unit-construction 4-speed transmission, this motorcycle became a staple in the AMA and the Motorcycle Hall of Fame.
Engine Design and Technology Insights
Unveiling the intricate engineering behind the 1959 Harley-Davidson KR750's engine design and technological advancements showcases a blend of precision and innovation that set this motorcycle apart in the realm of road racing. The engine of the KR750 was a side-valve 45 cubic inches (750cc) V-twin powerhouse, finely tuned to deliver power efficiently to the rear wheel. One of the notable features was the modified M54 Linkert carburetor, optimizing performance for top-notch speed and acceleration. Ignition, crucial for combustion, was ensured by a reliable magneto system, guaranteeing a consistent spark. The transmission, a unit-construction 4-speed setup, worked seamlessly with the engine to maximize the KR750's capabilities. This finely crafted machine, ridden by Joe Leonard, a three-time AMA Grand National Champion, proved to be a formidable weapon for nearly any road racing competition. In the engine's design, hundreds of holes were drilled, showcasing the meticulous attention to detail that contributed to its exceptional performance.
| Feature | Description |
|---|---|
| Carburetor | Modified M54 Linkert carburetor for optimal performance |
| Ignition System | Reliable magneto system providing consistent spark for combustion |
| Transmission | Unit-construction 4-speed setup efficiently delivering power to the rear wheel |
Significance of the KR750 Engine
Highlighting the pivotal role of the KR750 engine in shaping the performance and legacy of the 1959 Harley-Davidson road racing motorcycle, the significance of this powerhouse can't be understated. Here's why the KR750 engine stands out:
- Dominance in Racing: The KR750 engine played a crucial role in Harley-Davidson's success in road racing competitions, leading the brand to numerous victories, including the National Championship.
- Endorsement by Experts: Renowned figures like Marsh Runyon, an esteemed American Motorcyclist, lauded the KR750 engine for its exceptional power output, which propelled the motorcycle to new heights in terms of performance and speed.
- Engineering Marvel: Featuring a 45 cubic inch side-valve V-twin engine with a modified M54 Linkert carburetor, the KR750 engine boasted 46 horsepower at 6500 RPM, making it a standout choice for riders seeking both power and precision on the track.
Conclusion
In conclusion, the 1959 Harley-Davidson KR750's side-valve 750cc V-twin engine was a powerhouse on the track. With its impressive power output, top speed, and lightweight design, the KR750 set a new standard for high-performance racing motorcycles.
The engine's efficiency and endurance ensured its dominance in the AMA Grand National Championship, solidifying Harley-Davidson's reputation as a leader in the world of motorcycle racing.
