Product overview This physical teaching model demonstrates the basic working principle and main structure of a four stroke single cylinder gasoline engine. It makes internal engine movements visible and easier to explain in classroom demonstrations and hands on lab sessions. Key specifications Color: as pictured Package contents: one set Size: 30 x 17 x 11 cm Weight: 900 g Power: connect two terminal posts to a 1.5 to 2 volt power supply, or install one No. 5 dry battery in the battery clamp on the bottom plate Main features and functions Visible four stroke cycle: The flywheel and moving components display intake, compression, ignition, and exhaust strokes. A flashing ball on of the cylinder indicates the ignition event and shows that ignition uses an advance angle. Motion conversion demonstration: Clear linkages between piston, connecting rod, crankshaft, and flywheel show how linear reciprocating motion is converted into rotational motion. Valve train and timing: Two timing gears on the right side mesh at a 1 to 2 gear ratio. Crankshaft rotation drives the camshaft so students can observe push rod, rocker arm, and valve movement and learn valve timing and gas valve mechanism. Practical detail: The instrument layout places the flywheel on the left and the crank and camshaft timing gears on the right. Compression ratio is represented in typical gasoline engine ranges of about 5 to 8, with a proportional gap at dead center to reflect actual engine design practice. Why this model is useful Makes abstract engine principles tangible by showing real mechanical movement in a compact, durable teaching model. Supports step by step demonstrations of piston movement, valve timing, ignition timing, and how those elements interact during the four stroke cycle. Simple power options and controls let instructors focus on demonstration rather than setup. The power button and piston adjustment let you position the model at dead center before operating. How to use (concise) 1. Connect the two terminal posts to a 1.5 to 2 volt power supply, or place a No. 5 dry battery into the bottom plate battery clamp. Close the power button. 2. Adjust the piston to dead center, then rotate the flywheel slowly in the direction of the arrow. Observe piston, intake valve, exhaust valve, and ignition actions through the four strokes. 3. Watch the flashing ball at the of the cylinder to identify ignition timing and the advance angle. Observe the right side timing gears moving at a 1 to 2 ratio and the resulting valve train motion. Suitable applications and scenarios Middle school physics class: Demonstrate the heat engine chapter with a hands on visual model that clarifies the four stroke cycle and basic engine structure. Laboratory exercise or club activity: Small groups can examine linkage movement, timing gear action, and ignition behavior in a controlled, repeatable way. Teacher training or technical demonstrations: Trainers can use the model to explain mechanical relationships and timing concepts before introducing more advanced engines or systems. Additional notes The model is intended for educational demonstration of heat engine principles and not as a functional power unit. Size and weight make the model easy to store, transport, and set up for classroom use.