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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. Some rocker arms (called roller rockers) include a ...
In an internal combustion engine, a tappet (also called a 'valve lifter' or 'cam follower') [3][4][5] is the component which converts the rotation of the camshaft into vertical motion to open and close an intake or exhaust valve. The principal types of tappets used in automotive engines are solid, hydraulic, and roller. [6][7]
Specifically, the camshaft acts on the roller member of intermediate shaft, transferring the movement to both finger followers, then towards the roller rocker arms and ultimately to the intake valves. When the angle of the finger followers is narrow with respect to the roller member, valve lift is low. As the angle increases, so does valve lift.
VTEC-E is the first version of VTEC to employ the use of roller rocker arms and because of that, it forgoes the need for having 3 intake lobes for actuating the two valves—two lobes for non-VTEC operation (one small and one medium-sized lobe) and one lobe for VTEC operation (the biggest lobe).
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.
The valves are actuated by hydraulically adjusted rocker arms with roller cam followers. The SRT-4, PT Cruiser Turbo, Cirrus LXi [México only] and Stratus R/T [México only] use the same engine block and heads. EDV 2.4L DOHC Turbocharged engine used in a Mexicans Stratus R/T & Cirrus (2001-2006)
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