The Rocker Arm is crucial to the function of Toyota avalon vehicles and plays an important role in the engines valvetrain system to move the motion from the pushrod to the intake as well as the exhaust valves. Usually made from stamped steel or aluminium, these parts transform linear movement of a pushrod vertically oriented into the required amount of force to lift the valves. While the aluminum is commonly used for the engines operating at high RPMs because of the engine's weight, cast iron or forged carbon steel is employed for the diesel engines because of their sturdiness. Different types of rocker arms like roller rockers have incorporated needle bearings to minimize friction and wear and thus are better than most of other designs. The rocker ratio seen in the contemporary motors goes between 1.5:1 and 1.8:1 thus enabling the camshaft to lift with a higher level of authority than before. New generation fulcrum bearings are also used where there is high RPM for load control and increase the life of the rocker arm system.
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