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Techno Geeks If it uses 1's and 0's, is scientific, deals with physics or makes you have bad flash backs about the Chem lab tell us about it Fuels, parts, theories, If it in any way shape or form deals with the Auto Industry the geekier the better.

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Old 09-16-2006, 04:18 AM
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Variable Valve Timing

Since the 2007 Titan has this technology I thought it would be nice if we understood it.

Valves control the flow of air and fuel, into the cylinders and exhaust out of them. When and how long the valves open (timing) and how much the valves move (lift) both affect engine efficiency.

Optimum timing and lift settings are different for high and low engine speeds. Traditional designs, however, use fixed timing and lift settings, which are a compromise between the optimum for high and low speeds. VVT&L systems automatically alter timing and lift to the optimum settings for the engine speed.

Potential Efficiency Improvement of this is 5%.

By the way, General Motors patented the first variable valve timing and lift or smart valve system in September of 1975.

This link will take you to a hardcore PDF on this.

Last edited by Squid; 09-16-2006 at 04:21 AM..
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Old 09-17-2006, 12:01 AM
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i remember when i had my civic ex that had VTEC! whenever i hit about 5200 rpms you can literally hear a change in the sound of the engine and feel a rush of power, kinda like a mini-turbo! it was cool, but d@mn little 4 cylinder had to be pushed at high rpms for power!!
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Old 09-17-2006, 12:08 AM
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My YZ80 had a high RPM powerband that was very impressive .... is that kind of what VVT does for a 4 stroke ??
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Old 09-18-2006, 02:55 AM
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Hmmm. This seems to be the subject of the week!
I went to the local dealer and checked out the new 07 Titans and they now have the VVTi.
I got me a little video of it right here! http://videos.streetfire.net/recentv...3c0143dba4.htm
Listen closely at the end of it and you can hear the retard dealer trying to tell me that the Crew Cab has 506 HP and the King Cab has 317HP! LOL
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Old 09-18-2006, 07:53 AM
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Damn work blocking streaming media!!
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Old 09-18-2006, 02:47 PM
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Quote:
Originally Posted by ShiftyB View Post
Hmmm. This seems to be the subject of the week!
I went to the local dealer and checked out the new 07 Titans and they now have the VVTi.
I got me a little video of it right here! http://videos.streetfire.net/recentv...3c0143dba4.htm
Listen closely at the end of it and you can hear the retard dealer trying to tell me that the Crew Cab has 506 HP and the King Cab has 317HP! LOL

I still like the comments.
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Old 12-18-2006, 04:41 PM
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This looks like confirmation.... a TSB on it!

http://www.nissanhelp.com/Ownership/.../NTB06-079.htm
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Old 12-18-2006, 06:19 PM
NorCal 4x4 NorCal 4x4 is offline
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Quote:
Originally Posted by steves View Post
This looks like confirmation.... a TSB on it!

http://www.nissanhelp.com/Ownership/.../NTB06-079.htm
I thought this was new on the '07 Titans? This TSB is listed under the '04 TSBs
1996-2007 ALL NISSAN MODELS; DTC FOR VARIABLE VALVE TIMING CONTROL FUNCTION

Also one of the engines listed is the VK56
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Old 12-18-2006, 06:31 PM
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Well my Titan has one new rattle and it's been doing it for about 2 months and only under a slight engine load under the hood.
Sounds like this rattle from the TSB!
Attached Thumbnails
variable-valve-timing-rattle.jpg  
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Old 12-18-2006, 08:52 PM
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Quote:
Originally Posted by swarren1 View Post
I thought this was new on the '07 Titans? This TSB is listed under the '04 TSBs
1996-2007 ALL NISSAN MODELS; DTC FOR VARIABLE VALVE TIMING CONTROL FUNCTION

Also one of the engines listed is the VK56
It was applicable to all Nissans with VVT. The vk56 is just one of them now. I think the qx56 has always had it?
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