Suitable for middle school physics course experiments to illustrate engine fundamentals and support handson learning Used to explain the basic structure and working principle of a fourstroke singlecylinder engine, helping students connect theory with a tangible model Two modes of use: manual operation or connected to a power supply, allowing flexible classroom demonstrations and experiments Already assembled and ready to use, enabling quick setup and minimal teacher preparation Practical benefits for educators and students: clear visualization of engine operation, reliable and repeatable demonstrations, and easy integration into lesson plans Compatible with standard classroom environments where a power supply can be used to drive the model, or operated manually for observation and discussion Key use scenarios Inclass demonstration: the teacher uses the model to show the fourstroke cycle in real time, illustrating the sequence and interactions of components without complex setup Lab exercise: students connect the model to a power supply to observe continuous operation, record observations, and discuss the principles of intake, compression, power, and exhaust strokes Tutoring or home study: students run the model during guided practice to reinforce understanding of engine structure and operating principles, then compare with theoretical diagrams