The Rocker Arm is designed to support and operate the valves in Lincoln Mark VII automobiles by translating the motion from the pushrod into the movement of the intake and exhaust. Usually made from stamped steel or aluminum these parts translate the up-down movement of the push rod to the down force required to open the valves. Aluminum is used at high RPM because of relative low density while cast iron or forged carbon steel also known as high Silicone alloy is used in diesel engines due to high strength. There are differences in designs of a rocker arms which include roller rockers that has the use of needle bearings in order to minimize wear out. Housed in contemporary motors, the rocker ratio sits between 1.5:1 and 1.8:1; this augments camshaft lift. Upgraded fulcrum bearings are also used in stress applications and the high RPM engines to reduce the stress and improve the durability needed for the rocker arm system to function properly.
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