Variable Valve Event and Lift
- Variable Valve Event and Lift
Nissan Variable Valve Event and Lift (commonly known as VVEL) is an automobile variable valve timing technology developed by Nissan.
Nissan VVEL was introduced with the Nissan VQ Engine VQ37VHR in 2007 on the Infiniti G37. VQ37VHR motor specs: 11.0:1 CR, 95.5mm bore, 86mm stroke, 7500rpm redline.And now used in the all new VK50VE.
A rocker arm and two types of links close the intake-valves by transferring the rotational movement of a drive shaft with an eccentric cam to the output cam.The movement of the output cam can be varied by rotating the control shaft within the DC motor and changing the fulcrums of the links. This makes a continuous adjustment of the valve lift amount possible.C-VTC and VVEL together control the valve phases and its valve events and lifts, allowing free-control of the valve timing and lift. This results in more efficient airflow through the cylinder and significantly improves responsiveness, optimizing the balance between power and environmental performance.
It functions similarly to BMW's Valvetronic system.
Similar functioning systems have been announced by Honda (Advanced VTEC or AVTEC) and Toyota (Valvematic).
External links
* [http://www.nissan-global.com/EN/NEWS/2007/_STORY/070329-01-e.html Nissan press release March 29, 2007]
* [http://www.nissan-global.com/EN/TECHNOLOGY/INTRODUCTION/DETAILS/VEL/index.html Overview, Variable Valve Event & Lift System]
* [http://www.youtube.com/watch?v=nHdvudnM0gM&eurl=http%3A%2F%2F72%2E14%2E205%2E104%2Fsearch%3Fq%3Dcache%3Ahn137L0ROHcJ%3Awww%2Eworldcarfans%2Ecom%2Fvideos%2Ecfm%2Fvideoid%2F4070404%2E003%2Fcountry%2Fjcf%2Fvideo Video of operation]
* [http://www.toyota.co.jp/en/news/07/0612.html Toyota press release, Valvematic, June 12, 2007]
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