Nissan Variable Valve Event and Lift (commonly abbreviated asVVEL) is anautomobilevariable valve timing technology developed byNissan.
Nissan VVEL was first introduced to the US market in late-2007 on the 2008Infiniti G37 Coupe sporting the new "VVEL"VQ37VHR engine (VQ37VHR motor specs: 11.0:1 CR, 95.5mm bore, 86mm stroke, 7500rpm redline). VVEL variable valve timing is also used in theVK50VE V8 engine from theInfiniti FX50.
A rocker arm and two types of links open 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 is varied by rotating the control shaft with a DC stepper motor and changing thefulcrums of the links. This makes the continuous adjustment of the amount of the valve's lift (e.g., the amount of intake opening), during the intake valve event in the four-stroke cycle, possible.CVTC and VVEL together control the valve phases and its valve events, allowing free-control of the valve timing and lift. This results in more efficient airflow to the cylinder, significantly improved responsiveness, optimizing the balance between power and environmental performance.
It performs similarly toBMW'sValvetronic system but withdesmodromic control of the output cam, allowing VVEL to operate at higher engine speeds (RPM). Other similar systems are offered byToyota (Valvematic).
