Some well-regarded motorcycle engine designs include:
Inline-Four: Inline-four engines are known for their smooth power delivery, high revving capabilities, and balanced performance across the RPM range. They often provide a good combination of power, torque, and overall performance.
V-Twin: V-twin engines, with their distinctive V-shaped configuration, are favored for their strong low-end torque and characterful exhaust note. They are commonly found in cruisers and offer a good balance between power and fuel efficiency.
Boxer: Boxer engines have horizontally opposed cylinders, providing a low center of gravity and excellent balance. They are typically associated with BMW motorcycles and offer smooth power delivery, good torque, and unique engine characteristics.
Single-Cylinder: Single-cylinder engines are simple, lightweight, and efficient. They are often found in smaller displacement motorcycles and are valued for their reliability, fuel economy, and off-road capabilities.
Triple: Triple-cylinder engines are known for their smoothness, broad power delivery, and distinctive exhaust note. They offer a good compromise between the torque of a twin-cylinder and the high-end power of an inline-four.
These are just a few examples, and different riders have their own preferences based on their riding style, preferences, and the type of motorcycle they enjoy. Ultimately, the "best" engine design is subjective and can vary depending on individual preferences and the intended use of the motorcycle.