Custom Ground Cams

[Gemmer]

somethings wrong, I just noticed the 3.4 DOHC specs I was using doesn't seem to have the stock cam set up...I put in the measured 94 specs when I noticed and It kinda threw things outa whack...

I need to know what the specs of the origional file are based off of...

[blk92z34getrag]

[SappySE107]

Check if you are using seat to seat specs or .050 lift specs. That will throw things off if you use the wrong specs for how the program thinks its gonna be.

[SappySE107]

There is the 13 degree. Now remember, it shows a few hp drop at 2k yet I hear (it hurts lowend) so the auto owners may wanna think about losing 20+ hp compared to less than 5 for merely retarding the exhaust. Also, the idle gets rough with the stock idle speed so with cams, you will need computer programming for at least idle for drivability, and full tuning for all the power.

[MyGt]

There is the 13 degree. Now remember, it shows a few hp drop at 2k yet I hear (it hurts lowend) so the auto owners may wanna think about losing 20+ hp compared to less than 5 for merely retarding the exhaust. Also, the idle gets rough with the stock idle speed so with cams, you will need computer programming for at least idle for drivability, and full tuning for all the power.

Have you try the 13 degrees in the 96-97 engine, and see what it comes to be like?

Thanks!

[34T]

Ben; just to be sure; the 13 degree curve is applied to the otherwise stock cam, right?

re: long/short intake runners; I am sure you guys have seen the ones that are avail in (at least some of) the jap cars; Acura for one; it is (surprisingly to me) NOT vacuum controlled; instead it is electronically managed by the ecm based on rpm (among other things). It is basically a big diverter flap inside the int. manifold that will open, or shorten the flow path at a selected rpm. I am kind of toying with doing something like that with the big box plenum; put some passage 'runners' (for lack of a better word) in it then have the 'flap' open up to bypass them based on vacuum but I haven't put much thought into it yet. Partly because I am pretty sure I will go turbo at some point.......

[sspeedstreet]

Seeing that 13* hp curve added to the dyno chart makes the reground cam a little less appealing to me.

[34T]

OK; I got an answer (answers actually) back from the guy who says he will regrind cams. I don't know his business or rep or anything, he has a website and email and shop and specializes in J Body stuff but has a lot of items for the 60-V6 apparently.
He says if we can do a group buy of MINIMUM 3 guys (so 12 cams) he can do weld and regrind to either spec set (W41 or GM that was posted earlier in this thread) for $250 Cdn per cam; $1000 per set. Exchange is about 1.35 or so right now? So that is about $740 or so US$. Everything is hand done so I can see that time is involved in each, but I am not a cam grinding expert either.

So: are there 3 guys interested in getting this done? If it is one or two at a time he says the cost will have to be higher.
LMK and we can see where this is going. Please bear in mind that I am not promoting this guy or do I have any knowledge of his shop. It is in Toronto Ont and I have been emailing back and forth; that is all.

[SappySE107]

Yes, that 13 degree spec is using stock cams. It is also the reason I am not worried about cams right now.

Is that jbodyperformance.com that you are talking to? Either way, ill go with 500 and no border tax before I send them over the border to pay more.

[34T]

yup; that is them. Do you know of them (sounds like it) - for some reason? IF so that would be good to know. What is it you can get done for the $500 Ben? weld and grind or grind exist only (is that an option?) or what?
And where ie what state? Is that based on a group buy or individual?
I am interested in all options. I like the GM specs but the so called W41 sounds interesting too.

The big thing for me is to get some advice in case (when, not if) I go turbo; ie what specs would be best and I can't find anyone who has that knowledge for the 3.4 specifically.

[SappySE107]

Well, JBP is high on everything, and they made some claims on their crank back in the day that was false (they now really do offer a forged crank, but they said they did in the past when they didnt).

I already posted the place in this thread somewhere. They are in california, and its the going rate, not a bulk rate. I don't know if they offer a weld and grind but they do regrinds for the northstar engines as well so they definetly know what to do. Im trying to remember the name. It was about 500 I believe shipped back to me when I asked them. www.chrfab.com Had to look up the old news post I made on the site. Alan Johnson is who I talked to, and I would ask him about the welding aspect of it. I know they outsource the cam grind as well but I dunno who they go through for it. Pricing seemed reasonable anyway and they are the ones that got me the 94 cam specs.

For boost, talk to them, I am sure they have a good idea of what you would need.

[34T]

thx Ben; all good info; thx for looking it up, too.
I can get stuff shipped pretty reasonable thru/from the states; just go to my friendly local border UPS store and bring it back myself, so the shipping and border crossing issue is largely (not entirely) solved.
The forged crank is what led me into that line of thought and questions (wrt cam grinding) in the first place.
gp

[Gemmer]

Ben: Well, it seems the 94 specs on pg 4 are measured at .050, and I thought they looked a little funny, so I set DD to .050 and put in those specs and the curve went way out of stock specs.

Whats goin on?

[SappySE107]

I have seat to seat specs....

Here are my settings.

.369 intake
.373 exhaust
9 IVO 53 IVC
57.5 EVO 15.5 EVC

[Gemmer]

Those seat to seat specs work perfectly

The "94" specs show a big HP gain and a decent TQ loss, so Im wondering whats up with them