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The Harley-Davidson Milwaukee 8 Motor: Pros and Cons

Harley-Davidson, one of the most iconic motorcycle brands in the world, has long been synonymous with power, heritage, and the open road. One of the brand's standout innovations in recent years is the Milwaukee 8 motor, a powerhouse that has stirred both excitement and debate among motorcycle enthusiasts. In this post, we’ll delve deep into what the Milwaukee 8 engine brings to the table, examining its strengths, potential drawbacks, and overall impact on Harley-Davidson motorcycles.

The Background of the Milwaukee 8 Engine

The Milwaukee 8 engine, introduced in 2017, was Harley-Davidson's bold step forward to replace the Twin Cam engine that had been the cornerstone of their lineup for nearly two decades. Named for its eight valves (four per cylinder), this V-twin engine marked a significant technological shift for the company, promising greater power, improved efficiency, and enhanced rider comfort.

The Milwaukee 8 is available in several displacements: 107 cubic inches (1,746cc), 114 cubic inches (1,868cc), and the larger 117 cubic inches (1,923cc). These variations are found in different models across Harley-Davidson's Touring and Softail lines, with each engine size catering to various riding needs and preferences.

Pros of the Milwaukee 8 Motor

1. Enhanced Power and Torque One of the most celebrated aspects of the Milwaukee 8 engine is its significant boost in power and torque compared to its predecessor. The addition of four valves per cylinder allows for better airflow, resulting in improved combustion. Riders immediately notice the enhanced acceleration and pulling power, which is particularly beneficial for long-distance touring and carrying passengers or cargo. The engine delivers torque ranging from approximately 111 lb-ft in the 107 variant to 126 lb-ft in the 117, ensuring a robust and thrilling riding experience.

2. Smoother and Cooler Performance Harley-Davidson addressed some of the persistent issues with engine heat that plagued earlier models. The Milwaukee 8 comes equipped with improved cooling mechanisms, either oil-cooled or twin-cooled (liquid-cooled) depending on the model. These cooling enhancements contribute to a more comfortable ride, especially during long trips or in warmer climates. Additionally, the engine’s redesigned cylinder heads and better oil circulation reduce excessive heat buildup, ensuring the rider’s legs and thighs remain more comfortable.

3. Better Fuel Efficiency The Milwaukee 8 motor boasts improvements in fuel economy, a much-appreciated feature for long-distance riders. Harley-Davidson claims that this engine is roughly 10% more fuel-efficient than its predecessor. For those who spend hours on the open road, this translates to fewer fuel stops and cost savings over time.

4. Quicker Throttle Response Riders often rave about the Milwaukee 8's immediate throttle response. The engine’s refined design ensures faster acceleration and a more responsive feel, contributing to an engaging and connected riding experience. This quick response is due to the improved air/fuel mixture and optimized combustion, giving riders more control and confidence in various riding conditions.

5. Reduced Vibration Harley-Davidson’s iconic “potato-potato” sound is preserved with the Milwaukee 8, but the engine runs with noticeably reduced vibration. This is achieved through the use of a single internal counterbalancer that smooths out most of the vibration while maintaining the traditional Harley feel. The reduced vibration not only enhances rider comfort but also minimizes fatigue on longer rides.

6. Improved Maintenance and Durability The Milwaukee 8 engine is designed with simpler valve adjustments and fewer components requiring frequent servicing, making it easier and less costly to maintain. Harley-Davidson's dedication to engineering an engine with improved longevity means riders can enjoy thousands of miles with minimal mechanical issues.

Cons of the Milwaukee 8 Motor

1. Initial Cost Harley-Davidson motorcycles equipped with the Milwaukee 8 motor are known for their premium pricing. While the investment often reflects the quality and performance enhancements, the higher price tag can be a barrier for potential buyers, especially those considering entry into the world of Harley-Davidson. The cost of upgrading or customizing these models can also add up, deterring some enthusiasts.

2. Heat Management Concerns Although the Milwaukee 8 motor introduced better cooling systems, some riders still report heat management issues, particularly on the larger 114 and 117 variants during heavy traffic or in extremely hot weather. While this is less pronounced than in older Twin Cam engines, it remains a factor that riders should consider, especially if they frequently find themselves in stop-and-go conditions.

3. Potential for Mechanical Issues As with any major new engine design, the early models of the Milwaukee 8 experienced teething problems. Some owners reported issues with oil sumping, where oil accumulates in the crankcase and disrupts engine performance. Harley-Davidson has since addressed many of these concerns with service bulletins and updates, but it’s crucial for potential buyers of used models to verify that these issues have been resolved.

4. Weight Considerations The Milwaukee 8 motor, particularly in its larger displacements, adds weight to the motorcycle. While this is expected in touring models designed for stability on long rides, it can be a concern for those looking for a more agile and nimble ride. The added weight may require a rider to adapt to a different handling approach, especially if they’re accustomed to lighter bikes.

5. Limited Aftermarket Modifications Due to the newer technology and specific engineering of the Milwaukee 8, aftermarket modifications can be more complex and costly compared to older Harley engines. Enthusiasts who enjoy customizing their bikes extensively may find fewer options or higher prices for aftermarket parts and tuning solutions.

Conclusion

The Milwaukee 8 engine represents a significant step forward for Harley-Davidson, balancing the legacy of the brand with modern performance and engineering. With enhanced power, reduced vibration, and better fuel efficiency, the Milwaukee 8 delivers on many fronts, satisfying both loyal Harley riders and attracting new enthusiasts. However, prospective buyers should weigh the initial cost, potential heat concerns, and the nuances of aftermarket modifications before committing.

Ultimately, the Milwaukee 8 motor continues to strengthen Harley-Davidson’s position in the competitive world of motorcycles, blending the classic roar of the V-twin with the performance riders demand today. For those who prioritize long-distance touring with power and reliability, the Milwaukee 8 is a compelling option that underscores Harley-Davidson's enduring appeal.