Internal Combustion Engine Valve Trains

Objective -To help develop a basic understanding of valve trains Valve trains -A fundamental element of internal combustion engines -Allow the combustion chamber of a piston engine to be opened and closed

Basic Components -Valves -Cam shaft -Push rods -Rocker Arms

Types of Valve Trains Pushrod -Cam shaft found within the engine block -Cam shaft lifts pushrods which lift the rocker arms which lift the valves Overhead cam -Cam found in the cylinder head -Cam shaft lifts rocker arms which lift the valves

Pros and Cons -A major goal of car manufactures is to get better gas mileage. -Pushrod engines are generally large displacement, low performance -Make most of their power at low RPM -Overhead cam engines are much more efficient -Capable of higher RPM Reference http://abbysenior.com/mechanics/valve.htm