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The
Basic of VTEC Mechanism
The basic mechanism used by the VTEC |
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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. |
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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. |
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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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