Decked in Chrysler PT Cruiser automobiles, the Rocker Arm is instrumental in the movement of the valvetrain of the vehicle's engine by helping transfer motion from the pushrod to the connecting rods that make the intake and exhaust valves move. Made from stamped steel or at times aluminum, the Rocker Arm's in a circumstance to transform the vertical movement of the pushrod into the ideal downward force to open the valves. For high rpm uses, aluminum constitutes the construction material because of its light weight while for more robust diesel engines, cast iron or forged carbon steel is used. It seems that Chrysler PT Cruiser cars may have different types of Rocker Arms namely, standard and roller types of Rocker Arms. Roller rockers in that they incorporate bearing to lessen friction are suitable for overhead valve engines and overhead camshaft engines. The rocker ratio that vary from 1.5:1 to 1.8:1 in the current engines have a role in boosting performance owing to their ability to magnify the lift opened by the camshaft. Higher quality fulcrum bearings are also used in high-RPM Chrysler PT Cruiser engines where there is high stress and hence need for stronger engines.
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