What is valve lift?

Valve lift is to open the valve wider and let the valve enter the cylinder more, thus improving the engine performance. The principle is the same, but in practice, each brand does show its magic power.

Independent variable valve lift is rarely used in practical products because it is difficult to meet the requirements of speed change on intake and exhaust flow characteristics. VLT with variable lift and timing is widely used in engines.

According to the control effect, variable valve lift technology can be divided into continuous valve lift adjustment (CVVL) and segmented valve stroke adjustment (DVVL), both of which have their own advantages and disadvantages.

Extended data:

An electronic control system with variable valve timing and valve lift is developed, which is the first valve control system in the world that can simultaneously control valve opening and closing time and valve lift.

Subsequently, Honda continuously upgraded VTEC technology and developed i-VTEC and Advance VTEC technologies, which can realize continuous adjustment of valve lift. After Honda, other automobile manufacturers in the world also introduced variable valve lift technology, such as Audi AVS, Mitsubishi MIVEC, Porsche Cariocam Plus and so on. Compared with phase valve lift adjustment, continuous valve lift adjustment is not as widely used as phase valve lift adjustment, and only a few companies such as BMW, Nissan, Fiat and Toyota have realized continuous variable valve lift.

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