![]() To understand why this multiplication factor is important, let's consider the following.Īs a piston moves up and down inside the cylinder of an engine, it will generate a corresponding demand for airflow in or out, relative to its velocity and direction. ![]() This means the lift obtained at the cam is multiplied by 1.426 to obtain the actual amount of valve opening. ![]() Stock MGB rocker arms are quoted as being a 1.426:1 ratio. The following article discusses the fundamental airflow needs of an engine and how rocker arms contribute to the ability of meeting those needs.Ī Rocker arm is a lever through which the action of the camshaft is transferred to the valve itself and the ratio of movement generated at the valve, to the amount of camshaft lift, is called the rocker arm ratio. Understanding how, when and why aftermarket rocker arms are beneficial to your engine will help you avoid dissapointing results and costly mistakes. Often these rocker arms are purchased in an attempt to increase engine performance, but do not always achieve the intended results. Nearly everyone associates aftermarket rocker arms with high performance engines, however few people actually understand them. The Ups and Downs Of Aftermarket Rocker Arms
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