What Does a Rocker Arm Do in a Car Engine? | .
Rocker arms have "ratios" -- the ratio is a measure of the arm's leverage, which in turn determines how powerful the force is that it can transfer to the valve stem. The ratio is determined by the length of the arm, both between its center of rotation and the point it contacts the cam lobe, and between its center of rotation and the top of the valve stem. A typical automotive rocker arm ...
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