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The Basic  of VTEC Mechanism

The basic mechanism used by the VTEC technology is a simple hydraulically actuated pin. This pin is hydraulically pushed horizontally to link up adjacent rocker arms. A spring mechanism is used to return the pin back to its original position.

 

 

    The VTEC mechanism is covered in great detail elsewhere so it is redundant to go through the entire mechanism here.

Instead we will look at the basic operating principles which can be used in later sectionse to explain the various implementations VTEC by Honda.      

    To start on the basic principle, examine the simple diagram below. It comprises a camshaft with two cam-lobes side-by-side.

These lobes drives two side-by-side valve rocker arms.

 

The two cam/rocker pairs operates independently of each other. One of the two cam-lobes are intentionally drawn to be different. The one on the left has a "wilder" profile, it will open its valve earlier, open it more, and close it later, compared to the one on the right. Under normal operation, each pair of cam-lobe/rocker-arm assembly will work independently of each other.


 

VTEC uses the pin actuation mechanism to link the mild-cam rocker arm to the wild-cam rocker arm. This effectively makes the two rocker arms operate as one. This "composite" rocker arm(s) now clearly follows the wild-cam profile of the left rocker arm. This in essence is the basic working principle of all of Honda's VTEC engines.

 

    Currently, Honda have implemented VTEC in four different configurations. For the rest of this feature, we will examine these four different implementations of VTEC.


 

 

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