The Rocker Arm in Ford Focus vehicles plays a critical function of the engine's valvetrain whereby it transfers motion from the pushrod to the intake and exhaust valves. Normally made from stamped steel or aluminum the Rocker Arm changes the movement of the push rod up and down to the much needed force to lift the valves. High RPM- engines necessarily work under high temperatures and hence, aluminum is required for low density while cast iron or forged carbon steel is required for durability in diesel engines. Other types of Rocker Arms include roller rockers that employ needle bearings which keeps friction and wear lower levels improving on performance on the overhead valve and overhead camshaft engines. The rocker ratio varies depending on the brand and model of a car and in modern Ford Focus models it comes to 1.5:1 to 1.8:1 which increases lift of the camshaft and helps to improve efficiency of the model's engine. Fulcrum bearings are used for most Ford Focus engines and stress is upgraded for high RPM focus engines to prove how Rocker Arm was developed over the years.
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