For this example, this is measured to be 2.5 inches. Since a Pontiac V-8 is a pushrod engine (instead of being an overhead cam design), it afforded us the opportunity to explore. Next, determine the distance from the pushrod to the pivot point. Exploring Rocker-arm Ratio and Cam-phase Tuning - Project Pure Poncho. In this case, this is measured to be 3.25 inches. This can be changed by installing different ratio rockers. The following example problem outlines the steps required to calculate a rocker arm ratio.įirst, determine the distance from the center of the valve stem to the pivot point of the rocker arm. However, the valve lift is normally specified with standard 1.5 ratio rocker arms. In general rocker arm ratios are designed to be in the range of 1.5:1 to 1.8:1. The ratio of a rocker arm is a measure of the leverage of mechanical advantage that is achieved by the rock arm due to it’s specific geometry. Rocker Arm Ratio DefinitionĪ rocker arm is a level, typically an oscillating lever in a combustion engine, that converts radial movement from the cam into linear movement at the poppet valve. To calculate a rocker arm ratio, divide the distance from the valve stem to the pivot point by the distance from the pushrod to the pivot point. X is the distance from the center of the pushrod to the center of the pivot point.Y is the distance from the center of the valve stem to the center of the pivot point.
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