Rocker arms
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==Overview== | ==Overview== | ||
| − | + | There are several types of rocker arms. Regardless of the type, the job of a rocker arm is to transmit the action from the lifter and pushrod following the cam lobe to the valve. | |
| − | There are several types of rocker arms. Regardless of the type, the job of a rocker arm is to transmit the action from the lifter and pushrod following the cam lobe to the valve | + | |
==Types== | ==Types== | ||
| − | + | ===Stamped steel=== | |
| + | A mainstay of OEM engines. They're cheap to produce and perform adequately, although in serious competition and high performance applications they leave a lot to be desired. The ratio is often less than advertised, the ball pivot like used by Chevy and Pontiac are prone to wear and friction. | ||
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| + | ===Roller tip=== | ||
| + | The roller tip only rockers are mostly a gimmick. Their only real advantage comes not from the roller tip, but from the more accurate ratio- stock stamped steel rockers have less than advertised ratios in many cases. | ||
| − | + | ===Roller trunnion=== | |
| + | Chevy Gen 3 and 4 engines use a roller trunnion without a roller tip. These rockers are very efficient and represent the state of the art as far as OEM rocker arms go. These rockers can be upgraded with a replacement trunnion bearing assembly and are then good for high performance use beyond what the stock bearings could take. | ||
| − | + | [[File:LS7 stock rocker arms.jpg]] <br style="clear:both"/> | |
| − | + | ===Full roller=== | |
| + | Aftermarket rockers are available as full roller (tip and trunnion). The benefits are less friction and less oil needed to lubricate them. | ||
| + | ===Self aligning vs. non self aligning=== | ||
[[File:SA vs non sa rockers.jpg]] | [[File:SA vs non sa rockers.jpg]] | ||
[[Category:Engine]] | [[Category:Engine]] | ||
[[Category:Undeveloped articles]] | [[Category:Undeveloped articles]] | ||
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