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rocker arm |
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rocker arm [′räk·ər ‚ärm] (mechanical engineering) In an internal combustion engine, a lever that is pivoted near its center and operated by a pushrod at one end to raise and depress the valve stem at the other end. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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The power output is controlled by a rocker arm and cam design that opens and closes a needle valve in the head. The use of Dual VVT-i and ultra-light pistons, along with efforts to reduce friction loss among parts such as by using roller bearings in the rocker arm valve train, are aimed at achieving at least 5% greater fuel efficiency than that achievable by conventional engines and at achieving clean exhaust emissions (equivalent to 75% lower than the maximum allowed by 2005 emissions standards). The prototypes then were cast in one of three molds--a plate, a bushing or a rocker arm (Figs. |
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