Four-Stroke Petrol Engine Demonstration Model

This model shows the internal structure and operating principles of a water cooled four-stroke engine. The valves are clearly evident, cams being driven by a gear train from the rear of the main crank. A cross section of the carburetor is shown. Hand powered motion supplied through a crank demonstrates the moving parts of the engine. Crank shaft, piston, valves and cams cycle through all stages of the four-stroke process as the handcrank is rotated. A simulated spark plug uses a small lamp to indicate the firing point. Solidly constructed out of aluminium and plastic. This large model measures 11 x 8 x 5 inches and is mounted on an 8 x 8 x 2.5 inch base. A placard on the base labels all key components. Lamp requires 2 AA batteries (not included).