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, then is the new VTEC system layout, and there is a world of difference in the past. The image on the right is to drive stepless change gear actuating drive device.
Review of some VTEC changes history, begin to introduce AVTEC idea, as mentioned above, the last VTEC systems are on the camshaft and valve between the rocker arm to do the work, through the hydraulic drive embolism to switch or high or low cam intervention, but AVTEC is not the same, its complex valve rocker the structure is greatly simplified, in the new system, the function has become relatively single rocker, rocker interior nor any embolic device. As shown in the following representation, Honda engineers originally complex rocker mechanism away, the variable part directly into a similar to the cam sleeve body wrapped in a cam shaft, comprises a can body is independent of the camshaft for rotation, through a simple, thickness is not equal to achieve different speed slider with the different height of the cam engagement, and the slide block thickness changes directly to the rocker arm, thus realizing the valve lift change.
Review of some VTEC changes history, begin to introduce AVTEC idea, as mentioned above, the last VTEC systems are on the camshaft and valve between the rocker arm to do the work, through the hydraulic drive embolism to switch or high or low cam intervention, but AVTEC is not the same, its complex valve rocker the structure is greatly simplified, in the new system, the function has become relatively single rocker, rocker interior nor any embolic device. As shown in the following representation, Honda engineers originally complex rocker mechanism away, the variable part directly into a similar to the cam sleeve body wrapped in a cam shaft, comprises a can body is independent of the camshaft for rotation, through a simple, thickness is not equal to achieve different speed slider with the different height of the cam engagement, and the slide block thickness changes directly to the rocker arm, thus realizing the valve lift change.
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