You do realize that there are 4 cams with VVT on this engine, right? It isn't just as simple as opening a comp cams catalog and picking out a grind...
But investing in such an involved item isn't really necessary for basic bolt-ons! You're gain won't be worth the money/effort spent.
VVT has NOTHING to do with it. Every Northstar since beginning production from the L37 and LD8 in 1993 to the obd compliant ones in 96 to the redesign in 2000 and the advent of the rwd LH2 in 2003 and then the hand built LC3 in 2006 has been a dohc 32v motor running quad cams.
Really! I had no idea that the N*, since it's advent, along with Shortstars/Aurora V8's were DOHC 32 valve motors running quad cams. Wow! You learn something new everyday. Not that I didn't do time in a GM service department and worked on them for a living!
Anyway, on a more non-sarcastic, serious note, I have never re-phased an LC3, so I cannot speak to it and it's VVT pre-cam degreeing/phasing setup, but I do know, from having to do a few of the regular Northstar's including the L37's, LH2's, LD8' (owned an LD8 and L47 Aurora V8 personally), over the years, there are some requirements to realignment of all 4 cams, which needs to have the crankshaft sprocket and intermediate sprockets need to be aligned. I believe the camshaft drive pins need to be positioned 90* to the head decks. I'm recalling this from memory, so shoot me if I miss a thing or two, but...
1) Re-install the primary and secondary chain guides.
2) Rotate the crank until the crank sprocket drive key is in the 1 o'clock position. I think OTC makes the tool to turn the crank. We had it in parts, so...
3) Crankshaft and intermediate sprockets need to have the drive chain installed around them, and they should be have their timing marks opposite each other. Install the intermediate sprocket retainer bolt, and then install the main chain tensioner. At this point, I recall that the tensioner block/shoe can be released and bolts can be tightened down.
4) Ensure all timing marks are vertical, and lock the crank into place with that OTC tool.
5) Install drive chain for LH drive, over the intermediate sprocket, be sure to have the CMP installed.
6) Install the secondary drive chain over chain guide, install the exhaust camshaft sprocket to the chain. The camshaft drive pin has to engage the notch marked LE (left exhaust).
7) Install the intake camshaft sprocket into the chain. The notch marked LI (left intake) engages the camshaft drive pin. This pin should remain perpendicular to the cylinder head face.
8) Install the exhaust sprocket bolt
9) Install the intake sprocket bolt
Now repeat this for the RH side.
Again, not sure now the VVT phasing the LC3 has will impact this process, because I never recammed an LC3. But I would like to think conceptually, that adding any form of artificial phasing would require a more involved amount of static degreeing to the camshafts. I could be wrong though.
This isn't like an LS1, throwing in a camshaft, cylinder #1 intake up, then degreeing it 112* (or whatever you wish to dial it in as), (my cliff notes version)...
This is a little more involved, especially when you change the geometry of the cam lobes, durations, and lobe seperations (the whole concept of upgrading the cams), done over 4 camshafts, I would also think a little more attention gets paid to degreeing them properly to work properly. Otherwise this whole process is for naught.
Also, on another note, GM Motorsports at one time had a book on the Indy Aurora V8 and developing it for performance/competition. VERY interesting bathroom reading. I should dig it up and refresh even my meager mind. I know It took a couple times of reading just to absorb some of the info as it is much more complex than other GM engines of that vintage.
Oh really. Read your post skippy. Sure as hell sounds like your making the claim it has four cams for the VVT.
Originally Posted by CMNTMXR57
You do realize that there are 4 cams with VVT on this engine, right?
Since you work on them and know everything Mr IKE I suppose we should all now down before you. Heck you should be able to answer your own question about the V not having ACC or how about being unable to parallel park itself like the XTS. Or how about the loss of the vacuum controlled ebrake release or power trunk pull down like older caddys had... Darn I just love to complain about the things my car doesn't have that make it an old man lazy car instead of something I might actually have to drive.
On the LC3, there are 4 camshaft phasing actuators, right?
If you want to resort to name calling, I'll let fly too.
Perhaps I wasn't clear... maybe this will help you... the LC3 is a 4 cam V8 with VVT.
Sorry for the confusion.
That sir is a correct statement for the LC3 and LH2 no argument there. But it has absoultly nothing to do with his question about camming it.
CHRFAB will spec out any set of four cams he can possible desire.
OP. As much as I hate them you may want to talk to D3 when you get into cams. TimmyC will also be a good source he 1 offed a turbo for his and tuned for it.
Automobile(s): 99 SLS and Turbo 07 STS-V-Now back to Supercharged
1/2 hr S of Grand Rapids, MI
Nobody makes cam blanks so the only option is reground stock. I'm pretty sure no one has done it with the VVT motors. The cost/benefit doesn't make sense to me at this time so I'm not actively pursuing the option.
We did custom cams for this motor back in 07. We did see some nice gains, but if I recall correctly we had our hands full with the ECU. But at that time we didn't have as many parameters available to us in terms of tuning variables. I would say, from experience, that there might be other options you would want to look at before going down the path of cams.