See
the diagram of the questions, If I believe that the vast majority of
readers will not conceal his inner excitement, "Advanced VTEC" the words
of the cover that red ornaments from the engine, they will know that it
is the latest evolution of the VTEC system works. VTEC
system since its introduction in 1989, has gone through the past two
decades has seen its best days, early from the most complete performance
DOHC VTEC, and then later in order to improve the fuel economy of the
VTEC-E, and the first time in K20A variable valve
timing system VTC aids as the i-VTEC system several upgrades, today,
Honda improve their VTEC, but before this time is different, the big
change completely beyond merely adding a "Advanced "so simple an English.AVTEC system, changes can be regarded as its make changes valve lift device. In
the past, in order to change the valve lift at different speeds, Honda
engineers are arranged on each valve camshaft three cam do with ordinary
camshaft layout, the three level and open the overlap angle different
cam are
responsible with low rpm and high rpm valve opening depth between the
cam and the valve at the same time adding a rocker switch what group of
rocker oil pressure change reaches the switching speed of the instant,
the original can be independent The
activities of the two groups rocker tied to a cam driven by high-angle,
so that the valve opening depth increases, this is the easiest VTEC
System Works. When
Honda the previous improvements VTEC system, did not this work too many
adjustments and changes, improvements for the first time can be
regarded as a low-level of improvement, the two intake valves per
cylinder can occur one and a half to open a full or
two of full actuation effect, which is considered from the fuel economy
VTEC-E system, but the first to be equipped with the system is the
F-series engine. To
the the K20A era Integra Type-R (DC5) and CR-V, the second VTEC system
evolution, Honda K series engine joined the VTC system for changes in
the camshaft drive end, in order to achieve the valve change
the function of the timing, but the i-VTEC commonly known as the black
top and red top models are totally different in the layout of the gas
distribution, the former only the intake camshaft with VTEC system,
while the red roof intake and exhaust valve lift possess changes in the system.On the left, is the layout of the new VTEC system, the starker past. The image on the right is driven steplessly change gear for moving the transmission device.
Recalled
some VTEC change history, start simple introduction of the the AVTEC
concept, as mentioned above, the VTEC system between the camshaft and
valve rocker arm to do the work to switch driven by hydraulic embolism
or high or
low cams intervention, but AVTEC is completely different from its
complex structure of the valve rocker has been greatly simplify, the new
system the rocker functionality has become relatively single, rocker
internal nor any embolization device. Represented
in the following figure, the Honda engineers originally complex rocker
to give up, the variable part of the direct production into a similar
camshaft sets of bodies wrapped camshaft, including institutions can be
independent of the camshaft rotation realize
different speed through a simple, not equal to the thickness of the
slider engaged with the different heights of the cam, and the slider
thickness variation is directly transmitted to the rocker, in order to
achieve the valve lift changes.
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