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2. Rocker arm - Wikipedia

   en.wikipedia.org/wiki/Rocker_arm

   A rocker arm is a valvetrain component that typically transfers the motion of a pushrod in an overhead valve internal combustion engine to the corresponding intake/exhaust valve. Rocker arms in automobiles are typically made from stamped steel, or aluminum in higher-revving applications.

3. Rocker cover - Wikipedia

   en.wikipedia.org/wiki/Rocker_cover

   A Shelby Mustang Windsor V8 engine with "Cobra Powered by Ford" labeled rocker (valve) cover (lower left) A 4-cylinder Lycoming O-320 aircraft engine, with the rocker box cover of one cylinder (of the two visible) removed to expose its rocker arms for inspection. A rocker cover, (UK), or valve cover (elsewhere) is a cover that encloses the ...

4. Desmodromic valve - Wikipedia

   en.wikipedia.org/wiki/Desmodromic_valve

   However, a desmodromic system must deal with the inertia of the two rocker arms per valve, so this advantage depends greatly on the skill of the designer. Another disadvantage is the contact point between the cams and rocker arms. It is relatively easy to use roller tappets in conventional valvetrains, although it does add considerable moving mass.

5. Overhead valve engine - Wikipedia

   en.wikipedia.org/wiki/Overhead_valve_engine

   This engine employed pushrod-actuated rocker arms, which in turn opened poppet valves parallel to the pistons. Marr returned to Buick in 1904 (having built a small quantity of the Marr Auto-Car, with one of the first known engines to use an overhead camshaft design), the same year that Buick received a patent for an overhead valve engine design.

6. Valvetrain - Wikipedia

   en.wikipedia.org/wiki/Valvetrain

   Cutaway of a dual overhead camshaft engine 1969 AMC V8 overhead valve engine. The rocker cover has been removed, so the pushrods, rocker arms, valve springs, and valves are visible. A valvetrain is a mechanical system that controls the operation of the intake and exhaust valves in an internal combustion engine. [1]

7. Compression release engine brake - Wikipedia

   en.wikipedia.org/wiki/Compression_release_engine...

   The typical compression brake consists of a hydraulic system using engine oil which transfers the motion of the fuel injector rocker arm to the engine's exhaust valve(s). When activated, the exhaust valve opens very briefly near the engine's top dead center , and releases the compressed air in the cylinder so that the air compression energy is ...