Fourstroke internal combustion engine model designed for middle school physics experiments. This compact, buildable kit clearly demonstrates the intake, compression, power, and exhaust strokes and exposes the main components of a working engine for effective classroom demonstration and handson learning. Key benefits Clear visualization of engine operation: Makes the fourstroke cycle and motion of pistons, connecting rods, crankshaft, and cam assembly easy to observe. Handson learning and assembly: Buildable DIY kit encourages student engagement and helps reinforce mechanical and physical principles. Durable and reliable demonstration: Constructed from plastic and metal to provide long service life and consistent demonstration performance. Compact and easy to demonstrate: Small footprint and recognizable parts allow simple setup on a classroom desk or lab bench. Main functions and attributes Function: Demonstrates the fourstroke internal combustion process and the conversion of reciprocating piston motion into rotary motion. Compatibility: Designed for middle school physics course experiments and classroom demonstrations. Materials: plastic and metal components for durability and clear mechanical action. Performance: Smooth mechanical movement using a gear and cam assembly and flywheel to show timing and motion. Lighting controller included to support visual demonstration of ignition timing. Included components Intake pipe and intake manifold Exhaust pipe and exhaust manifold Cylinders and pistons Connecting rods and crankshaft Cam and gear assembly Flywheel Injectors and oil needles Tappet Lighting controller DIY assembly kit with wiring and small hardware Practical use scenarios Classroom demonstration: Teacherled explanation of the fourstroke cycle with the model assembled and running on a desk for clear student viewing. Student laboratory activity: Small groups assemble the kit to learn component names, mechanical relationships, and basic engine timing. Science fair or project display: Use the model to illustrate mechanical energy conversion and to support a student report or poster. What this model solves Translates abstract textbook concepts into visible, moving parts that clarify how internal combustion engines work. Provides a reusable, robust teaching aid that supports practical skills through build and demonstration. Fits classroom environments where space and ease of setup are important. This internal combustion engine model offers a practical, durable, and educational tool for middle school physics courses that require a clear, handson demonstration of engine principles.