Building a rotary valve Lego engine offers a fascinating opportunity to explore mechanical principles through a creative, hands-on approach. In my experience, incorporating two rotary valves in the design effectively mimics the function of a rotary valve turbine engine, providing smoother airflow control and more efficient fuel intake and exhaust cycles compared to traditional piston valves. One of the challenges I encountered was ensuring the synchronization of the rotary valves with the engine's rotating parts; this required careful tweaking to maintain timing accuracy, which is crucial for optimal engine performance. Using Lego pieces allowed for easy modifications and testing of different valve sizes and shapes to achieve the desired effect. This project also enhances understanding of rotary valve engines, commonly used in various turbine models and advanced combustion engines, where their compact design and fewer moving parts reduce mechanical complexity and improve reliability. For Lego enthusiasts and engineering students alike, this serves as a practical model to visualize otherwise complex engine functions. Overall, combining rotary valve technology with Lego construction encourages experimentation and learning, delivering a fulfilling experience that bridges toy-building with real-world mechanical engineering concepts.