With side-valve engines, the positioning of the valves means the shape of the cylinder itself can interfere with airflow and exhaust flow, reducing the efficiency of the engine. The design of the OHV engine means more air is drawn in to the cylinder for a longer . Exhaust. The steam engine has a dead spot at the extreme end of each stroke while the valve is transitioning from power to exhaust. For this reason, most engines had a cylinder on each side of the engine, arranged 90 degrees out of phase, so the engine could start from any position. This illustration only shows one side of the engine. Jul 12, · A Sketch of a Side-Valve Engine. The disadvantage of the side-valve engine is that the air flow characteristics of the design are far from optimal. On the intake stroke, the intake valve will open and the suction caused by the downward movement of the piston will draw the air/fuel mixture into the cylinder and cylinder head. The intake air/fuel.
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