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  1. #1
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    Default Hyundai's Variable Valve Duration Tech Is a Genius Piece of Engineering



    "Hyundai recently introduced a new piece of engine tech into its lineup called Continuously Variable Valve Duration (CVVD). Similar to variable valve timing or variable valve lift, it physically alters the way the valves operate within the engine. But as Road & Track contributor Jason Fenske explains, Hyundai's solution is especially impressive.

    CVVD works exactly as it sounds. It's a system within the head that can alter how long valve stays open within the combustion cycle, allowing for more or less air to travel in and out of the cylinder, depending on the engine's rpm. It works using a specially designed camshaft that can alter the position of each cam lobe relative to its shaft using an actuator attached to the motor. It's some clever engineering that's best understood watching Fenske's models.

    The best part of this system is its flexibility. Because it's continuously variable, it can be optimized to work at every single part of the rpm range, rather than just two chosen points (which is how variable valve timing and variable valve lift work). Hyundai says the system allows for a five percent improvement in economy, a four-percent increase in performance, and a 12-percent decrease in emissions. ..."
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  2. #2
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    Default Re: Hyundai's Variable Valve Duration Tech Is a Genius Piece of Engineering

    Quote Originally Posted by Orxy View Post


    "Hyundai recently introduced a new piece of engine tech into its lineup called Continuously Variable Valve Duration (CVVD). Similar to variable valve timing or variable valve lift, it physically alters the way the valves operate within the engine. But as Road & Track contributor Jason Fenske explains, Hyundai's solution is especially impressive.

    CVVD works exactly as it sounds. It's a system within the head that can alter how long valve stays open within the combustion cycle, allowing for more or less air to travel in and out of the cylinder, depending on the engine's rpm. It works using a specially designed camshaft that can alter the position of each cam lobe relative to its shaft using an actuator attached to the motor. It's some clever engineering that's best understood watching Fenske's models.

    The best part of this system is its flexibility. Because it's continuously variable, it can be optimized to work at every single part of the rpm range, rather than just two chosen points (which is how variable valve timing and variable valve lift work). Hyundai says the system allows for a five percent improvement in economy, a four-percent increase in performance, and a 12-percent decrease in emissions. ..."
    BMW has the vanos and then the valvetronic system, since 2001.

    I think it is basically the same outcome..

    Each individual valve can be manipulated through the whole rev range.

    https://en.wikipedia.org/wiki/Valvet...0regular%20use.
    https://en.wikipedia.org/wiki/VANOS
    Last edited by Hedgehog; 2021/01/12 at 09:14 AM.
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  3. #3
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    Default Re: Hyundai's Variable Valve Duration Tech Is a Genius Piece of Engineering

    Have a look at Fiat's Multiair system, it's brilliant.

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