caption: The image shows a drawing of a four-cylinder engine on a white background. It is a detailed diagram of the engine, with its various components labeled and numbered. The engine is composed of four cylinders, each with its own set of pistons and valves. The pistons are connected to the cylinder head, and the valves are located on the side of the cylinder. The diagram also includes labels for each cylinder, such as the type of valve, the number of valves, and other specifications.