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All About VVEL

Old 03-29-2007, 11:18 AM
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Nissan Sport ed
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All About VVEL

Just got in the information from Nissan. www.nissansportmag.com

Dave Bexfield
Managing Editor, Nissan Sport
www.nissansportmag.com
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Old 03-29-2007, 11:23 AM
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AboostedG
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Nice read!!
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Old 03-29-2007, 12:08 PM
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Old 03-29-2007, 12:29 PM
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hai109
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Very nice!! Thanks for the info...
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Old 03-29-2007, 01:39 PM
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this part is interesting, "Under the Nissan Green Program 2010, Nissan has announced plans to develop gasoline-powered engines with CO2 emissions reduced to levels comparable with diesel engines, to be available globally by 2010. For multiple-cylinder, high-displacement engines, Nissan will combine VVEL technology with the direct-injection system." Pretty neat if it's introduced to the g37 soon.

Last edited by whassupG; 03-29-2007 at 01:42 PM.
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Old 03-29-2007, 03:04 PM
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finagle69
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looks like HP and MPG bump in 2010 then.
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Old 03-29-2007, 04:54 PM
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A few question i have ... maybe someone can answer them here


Questions are inline


* 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.


Is this feature negated by a turbo installation I mean with a possitive pressure system would it really make any differnce


* 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.


Here again your density charge is much higher that what would be accomplished via this system alone

* 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.

Blowback would not happen in a turbo application right ?

In the high range, greater intake-valve lift allows increased air intake to deliver greater torque outputs.

A possitive charge system would not see gains from this right ?


* 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.

I don't have a cat .... well I do but she stays home

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.

I get more effecientcy by running slightly lean on idle and low range... Its somewhat a drawback of a turbo system and the UTEC you will get about 1 or 2 PSI over NA in when the UTEC is not fully engaged


the reason I ask is because I have an '06 Coupe and really don't love the new design ..... I was thinking about just sleeving a block, boring to 100 (giveing me about 4 liters) and moving my mods over to the new block (well ok my piston and head will of course need to be reworked... for obvious reasons) and using that instead .... besides then I can go for something a bit more ...... agressive
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Old 03-30-2007, 11:37 PM
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guess no one has any input then ..

ok moving on to then
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Old 04-01-2007, 09:47 AM
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In addition to a full breakdown of the new VQ37, we'll be addressing some of these Qs in an upcoming issue of Nissan Sport.

Dave Bexfield
Managing Editor, Nissan Sport
www.nissansportmag.com.
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Old 04-01-2007, 08:10 PM
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KAHBOOM
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Very nice read

Thanks
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Old 03-25-2008, 11:25 PM
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vINCe_Inc
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All About VVEL

What makes our new VQ engine so VQ ? read on !
its all about VVEL baby... not vtech nor mivech or ditech can compare (i think)

.
hope this is not a repost.
www.nissan-global.com/EN/DOCUMENT/PDF/IREVENT/PRESEN/2007/070713VVEL-e.pdf

http://rapidshare.com/files/102415071/VVEL.pdf.html

Last edited by DiamondGCoupe; 03-26-2008 at 12:01 AM. Reason: Added rapid share link for easy downloading
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Old 03-25-2008, 11:46 PM
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Interesting! Why that wasn't written by a native English speaker, I only wonder....

As for the actual technology, it looks like the valve is adjusted by a dc motor turning a screwed gear? How on earth is that fast enough to respond to a rapidly revving engine?

From the sound of that presentation, you'd think we'd be getting a 100HP+ gain over the previous engine.....
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Old 03-25-2008, 11:51 PM
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bboysteele
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I remember reading that a long time ago. Good find.
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Old 03-25-2008, 11:55 PM
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DiamondGCoupe
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What is going on with this pdf file!

Edit: I had some problems getting this file to DL and load etc. so i saved it a hosted it rapid share, put the link in OP. Interesting read...


http://rapidshare.com/files/102415071/VVEL.pdf.html

Last edited by DiamondGCoupe; 03-26-2008 at 12:02 AM.
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Old 03-26-2008, 12:08 AM
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bboysteele
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Ya, I had to refresh my page to download it.
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