Frankly Speaking the Rocker Arm in Ford Excursion engine is used in the valvetrain where it functions to regulate the motion of the pushrod as it makes contact with the intake and exhaust valves. Traditionally made from materials of stamped steel or aluminum the Rocker Arm rotates to translate the movement of the pushrod vertically into the required down ward motion to open the valves. Where high RPMs are called for, aluminum is the more suitable material, while cast iron or forged carbon steel is used in a diesel engine environments. The various types of Rocker Arms for example roller rockers use bearings at areas of contact to minimize wear and tear and therefore enhance effectiveness. The rocker ratio that varies with modern engines between 1.5:1 and 1.8:1 enable magnified camshaft lift that increases performance. Everyday, new addition of fulcrum bearings are used in high RPM Ford Excursion engines to meet the more demanding stress and added toughness.
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