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View Full Version : Setting the record straight on Gen IV ADM/DoD and VVT


TBMSport
January 13th, 2010, 12:00 PM
Ok...everyone loves using Wikipedia's highly informative LS-based but it and LS1Tech are not helping.
:fluffy::help2:
Am I correct in understanding that until the advent of the '09 Cadillac Escalade Hybrid LFA and '10 Escalade L94 no previous LS motor has had AFM/DoD AND VVT?

Also, for those with a bit more mechanical knowledge, am I to also understand that adding VVT to any Gen IV simply requires the hardware of the timing cover, actuator, VVT cam, and notched pistons?
eclispe1
March 1st, 2010, 01:46 PM
I have a 2008 Impala SS and it has DOD and I think it goes back to 2006 on the LS4 engine. I'm not too sure on the VVT
GAMEOVER
March 1st, 2010, 01:58 PM
07 on trucks, 5.3ltr, 6.0ltr, 6.2ltr
swingtan
March 1st, 2010, 02:35 PM
Also, for those with a bit more mechanical knowledge, am I to also understand that adding VVT to any Gen IV simply requires the hardware of the timing cover, actuator, VVT cam, and notched pistons?

And ECM with suitable tune.........

From memory, the phasing is done via oil pressure fed from the cam bolt, hence why they went to a single bolt. The font half of the stock cam is hollow and there is an oil feed hole in number 2 bearing journal. The blot would then have a feed hole to provide oil pressure to the phaser.

In the Aus Gen IV engines I've seen, the bolt in the cam is a solid unit, so this would also need changing. I'll see if I have any pics available.,

Simon
gmtech16450yz
March 1st, 2010, 08:05 PM
In the full size trucks... 07,08,09 5.3's had DOD only. 07,08 6.0 (L76) had DOD and VVT.
A few early 07 6.2's (L92) had DOD and VVT, but they were pretty rare as far as I have seen. 08 6.2's only had VVT. L76 6.0's in the cars (G8's) had DOD only, no VVT. 6.0 GTO's had neither DOD or VVT.

I'm not in sales and I don't order the trucks so I could be off on a couple of these, but afaik that's how they came.
JAY4SPEED
March 2nd, 2010, 04:55 PM
I know the 2008 LY6 ironblock 6.0L has VVT but not sure on AFM.
gmtech16450yz
March 3rd, 2010, 08:14 AM
LY6- VVT no AFM sometimes EIEIO
GAMEOVER
March 3rd, 2010, 08:28 AM
My 08 Silverado L76 has AFM, DOD, VVT....i think...:D
swingtan
March 3rd, 2010, 10:12 AM
Here you go. Some pics of the front of the "VVT Capable" cam.....


First up, bearing journal #2. You can see how the oil is fed to the center of the cam.

http://farm5.static.flickr.com/4060/4404938400_8d5d150e76_o.jpg (http://www.flickr.com/photos/swingtan/sets/72157608442344351/)

Next, the front of the cam. Note the plug half way down the cam, to stop the oil running out the back. Also the 2 oil feed galleries and wider bolt hole to allow oil to flow in to the VVT adjuster.

http://farm3.static.flickr.com/2752/4404938398_6d7a6bc5cc_o.jpg (http://www.flickr.com/photos/swingtan/sets/72157608442344351/)

Simon.
GAMEOVER
March 3rd, 2010, 11:07 AM
Swingtan, did you take your engine apart just to get us some pics....:D J/K
swingtan
March 3rd, 2010, 11:32 AM
I had a spare 30 min last night so I thought I'd just pull the cam..........

No, seriously... It's from a VE L98 that I did a cam in a while back. Full details of that job are here....

http://www.ls1.com.au/forum/showthread.php?t=109136

Simon
GAMEOVER
March 3rd, 2010, 11:51 AM
Ive been trying forever to view info and become a member on that forum but, they won't let hotmail or gmail accounts join...:frown:
joecar
March 3rd, 2010, 04:29 PM
I had a spare 30 min last night so I thought I'd just pull the cam..........

No, seriously... It's from a VE L98 that I did a cam in a while back. Full details of that job are here....

http://www.ls1.com.au/forum/showthread.php?t=109136

SimonSimon,

That's a good write up... :cheers:
CalEditor
March 14th, 2010, 01:19 PM
Joecar
Check your email. :cheers:

Sorry I can't post them here
gmh308
March 14th, 2010, 01:23 PM
Simon,

That's a good write up... :cheers:

Yes an excellent write up! :cheers: Credit where credit is due! Probably the best cam swap commentary I have seen. :)
68problemchild
March 31st, 2010, 01:50 PM
Can anyone cut and past that write up? I have to swap the VVT cam in my L92 and I am pretty clueless on this stuff.

I have read the GM/Comp cams article. Its good too.

http://www.gmhightechperformance.com/tech/0903gmhtp_l92_comp_cams_vvt_cam_kit_install/index.html


Thanks!!
swingtan
March 31st, 2010, 02:43 PM
Well, there's not really a place for mechanical "how To" threads here, so I've just added the text to my Flickr set. It's got the text from the LS1 thread in it.

Click on the image for the Flickr set.

http://farm4.static.flickr.com/3084/2791360347_92bc7233ba_m.jpg (http://www.flickr.com/photos/swingtan/sets/72157606917622732/)
68problemchild
March 31st, 2010, 03:34 PM
that is absolutely awesome. Please keep it up as long as you can. My cam comes in next week!

Thank you. It will be a fantastic help.
swingtan
March 31st, 2010, 03:54 PM
It's on Flickr... it'll be there for a while ;)
SS Enforcer
April 2nd, 2010, 06:56 AM
Ive been trying forever to view info and become a member on that forum but, they won't let hotmail or gmail accounts join...:frown:

You wouldn't like it mate as the moderators there suck.:angel_innocent:

That is an excellent writup by Swingtan there as the photos are all relevent to the job being done.

cheers