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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?
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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?
What do I think? I think you're giving Nissan too much credit for "inventing" BMW's Valvetronic system.
My 2000 Celica GTS had variable valve timing and lift. Truth be told, it was probably invented long before any of us were born.
... 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.
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.
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03 Silver 5AT.... 6MT/ Porting in progress.
Can someone explain VVEL? I've tried to understand it but have failed.
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.
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Last edited by TreeFiddyZee; 11-28-2008 at 08:17 PM.
Can someone explain VVEL? I've tried to understand it but have failed.
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.
370z VVEL?
