Cide

iTrader: (1)

well i havent seen anyone talking about this maybe i just wasnt able to find it but what is up with the VVEL? i dont know if the g37 has it but that i think the the sickest thing on the new 370z. what do u guys think?

bruddahmatt

What do I think? I think you're giving Nissan too much credit for "inventing" BMW's Valvetronic system.

jumpin800agl

iTrader: (7)

yes G37 has it.

Cide

iTrader: (1)

well i know BMW has it its just cool to see that nissan is moving up

TreeFiddyZee

iTrader: (19)

My 2000 Celica GTS had variable valve timing and lift. Truth be told, it was probably invented long before any of us were born.

michaelm5

Surprisingly Fiat was the first:
http://en.wikipedia.org/wiki/Variable_valve_timing

Scotty2H

Nissan had variable valve timing long before the 370Z.

K20Z350

iTrader: (1)

Vtak is more catchy, Vvel is eh. lol

Jspeed

... but Toyota's VVTL system, like many others, only does 2-stage lift (basically switches between two cam profiles). VVEL (and Valvetronic) is capable of continuously variable lift.

Cide

iTrader: (1)

yeah but the new 370Z doesnt use the throttle plate to control the amount of air being sucked into the engine check out the promo video and u'll see what im talking about.

vnarang

iTrader: (7)

Can someone explain VVEL? I've tried to understand it but have failed.

TreeFiddyZee

iTrader: (19)

Variable Valve Event and Lift

"While conventional engines control air intake using a throttle valve, VVEL-equipped engines do this directly at the intake valves, continuously controlling their valve events and lifts. 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.

• Higher fuel efficiency

• At low-to-mid load ranges, the system controls air intake at the intake-valve, immediately before it enters the combustion chamber, in contrast with conventional engine air intake via a throttle valve, leading to increased efficiency by easing airflow through the cylinder.
• In the low- and medium-rpm ranges*3, intake-valve lift is kept low to reduce camshaft friction and improve fuel efficiency.

• Better response

• Controlling air intake at the intake-valves improves acceleration response by allowing more dense air into the cylinders from the start of acceleration.

• More power

• In the low-rpm range, the intake-valves open for a shorter period, preventing blowback of the air-fuel mixture and improving torque.
• In the high range, greater intake-valve lift allows increased air intake to deliver greater torque outputs.

• Cleaner emissions

• Intake-valve timing is optimized on startup, when the engine is still cool, to quickly raise the temperature of exhaust gases and more quickly activate the catalytic converter.
• Hydro-carbon emissions are reduced in the low-to-medium range by keeping intake-valve lift low, speeding intake flow and dispersing the fuel into a finer mist, resulting in more efficient full combustion"

Makes it breath better and at the right time.

T_K

iTrader: (5)

In this picture, the ECCENTRIC CAM, represents the typical cam on a standard engine. That's the one driven by the engine itself. It spins inside that assembly like a standard cam.

The rest is pretty much linked to the DC MOTOR, and that adjusts the positioning. It's all connected to it in a way that it changes the orientation of everything to minimize or maximize valve lift.



Theres a quick blueprint. The left represents higher lift, and the right is lower lift. Take a quick glance and you can see which items stay fixed between the 2. The circle that represents the ECCENTRIC CAM, stays fixed, meaning it rotates inside that assembly.

The actual "cam lobe" on the VVEL system looks goofy because it doesn't actually spin all the way around. It opens the valve, and then as the ECCENTRIC CAM rotates, it then causes the "lobe" to go through its movement in reverse. The lobe itself, therefore, move into the position to open the valve, and then just moves back, instead of rotating all the way around and reopening. It just rocks back and forth.

TK

mavtais

iTrader: (12)

So does the VQ35HR motor have VVEL too? Or only the VQ37HR? It doesn't say so on Nissan help.
http://www.nissanhelp.com/Models/200...ifications.htm

DIGItonium

iTrader: (1)

Nope. It's VQ37VHR, not VQ37HR. There's a VQ38HR used in the 380RS.

tziller1225

iTrader: (7)

hope the lift is as good as celica gt-s's

saywat?

is this alot different than the vtc on my 2.5 altima? lol

mavtais

iTrader: (12)

NVM, just got it

omegamanex

iTrader: (2)

i guess nobody has heard of the Nissan NEOVVL engines

SR16VE
SR16VE N1
SR20VE
SR20VE 20v
etc ...

http://en.wikipedia.org/wiki/VVL

Cide

iTrader: (1)

this is a completely diff vvel