![]() ![]() The system that is the focus of this article, the pushrod / rocker-arm / overhead valve mechanism, has been used in domestic automotive engines since the early part of the 20th century, because of the demonstrably-superior breathing capability provided by "valve-in-head" designs compared to the prevalent "side-valve" or "flathead" engine design in which the valves are in the engine block alongside the cylinders. The following picture (courtesy of Ford Motor Company )įigure 1: Pushrod Engine Cross Section (Ford Smallblock) In this system, closing the valve is done by the valve spring. ![]() The system in which we are most interested here is the cam follower in a bore, drivingĪ pushrod which moves a pivoted lever ("rocker arm") which presses on the tip of the valve and imparts reciprocating motion to To the valve by a variety of different mechanisms. The motion of a valve is generated by the shape of the cam lobe, which pushes on a cam follower of some sort, which then connects However, the motion of the valves relative to the positionĪnd velocity of the piston is perhaps even more important in determining the power a given configuration can produce. ("Four-Cycle") engine is extremely important to engine performance. ![]() The Basics of Valvetrain Technology - Cams, Lifters, Pushrods, Rockers, Springs, Retainers, Valves NOTE: All our Products, Designs and Services are ORGANIC, GLUTEN-FREE, CONTAIN NO GMO's, and will not upset anyone's precious FEELINGS BACKGROUNDĪs we presented in a previous section, the flow capability of the cylinder heads, intake passages and exhaust passages in a 4-stroke ![]()
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