Rob

iTrader: (6)

This is what I'm probably going to go with in the GTO. Stock 241 heads with Dynatech long tubes and cats going into the stock cat back. This would be on the Comp XFI lobes. Stock 3.46 gears also.

Mainly want torque that comes on early and doesn't rev. HP peak looks to be around 5900 or so. Shifts around 6300 where I am now with the GT2-3.

Not quite the norm Thoughts?

J-Rod

Intake Duration - ID 224
Exhaust Duration - ED 230
Lobe Center Angle - LCA (also known as LSA) 112
Intake Centerline - ICL 106


Intake Valve opens - IVO 6
Intake Valve closes - IVC 38
Exhaust Valve Opens - EVO 53
Exhaust Valve Closes - EVC -3
Exhaust Centerline - ECL 118
Overlap 3


I think you have to much exhaust split, and I think you have too much lobe. If you want torque, use less lobe, look at some of the cars Ed Curtis has cammed over on ls1gto.com. Nothing near that big.

Rob

iTrader: (6)

We were trying to make it exhaust biased since I'm running cats and the stock catback.

I know Ed's cams work Just thinking outside the box. But I appreciate any discussion on this since it is rather different.

J-Rod

Nope, thats what the site is for. You're M6, so you can offset some of the issues you'd have of trying to run that 224 ona stock stall.

Is drivability a big concern?

Any thought given to narrowing up the lobe sep, and not advancing the cam so much, and perhaps using a bit less lobe?

Rob

iTrader: (6)

Drivability is a major concern. I wanted torque to come in real early. Moving 4000+ car around really needs it.

We were originally going to shoot for something in the range of 224/228 .56x/.57x 111 LSA 106ICL but nothing really seemed to work out with timing events.

Trust me, I originally thought it was too big. I still do. But that's what we've come up so far.

JBIRD02

iTrader: (4)

theres been alot of threads lately about a cam w/ these characteristics. Alot of guys are going with the 'ol 224/.57x but on a 110+4. One of the dyno graphs showed 350 ft/lb. @ 2800, flat as can be, and I think the hp peaked at 6200. As a matter of fact I believe his name on here is DAPSUPRSLO. I've been considering something like this also, maybe a 226/.57x 110+2

Rob

iTrader: (6)

Matter of fact, that's who is doing the specs on this cam

DAPSUPRSLO

iTrader: (14)

Ha ha, good show guys! My thoughts on Rob's cam are as follows. First off the lobes that were used on my old 224 cam were the xe lobes which are much much slower then the new XFI comp lobes I want him to use. The reason for the early IVC is just as he stated, he wants an earlier power peak. These XFI lobes are very very fast, slower by one degree from .006 to .050 then the xe-r but faster then the xe-r from .050 to .200, and much much faster then the xe lobe that my previous cam ran on. Further, this cam will have similar overlap, actually one degree less then the previous 224 110 cam and about 3 degrees less at .006, which based on his stock exhaust will probably work better. I have opened the exhaust valve in this cam much ealier though to avoid pumping losses. When you have a restrictive exhaust system you can't have the best of both, best of both being preserving the power strokes energy while avoiding any pumping losses caused by poor flowing exyhaust systems. I am certainly not the be all end all of cam advise but i've learned a few things along the way and thought i'd offer an opinion for Rob

GrannySShifting

iTrader: (10)

If you have to advance the cam 6 degrees, it is too big to do what you are trying to do, it isnt nearly THAT exhaust restricted

Ive done cams on all the XFI family stuff, they arent SILLY aggresive, maybe a little more so over the nose then XE-R

If you need any of that comp stuff Rob/Nick let me know I can do pretty decent for ya.

PREDATOR-Z

0.050
222>Intake Duration - ID
228>Exhaust Duration - ED
111>Lobe Center Angle - LSA
107>Intake Centerline - ICL

4>Intake Valve opens - IVO
38>Intake Valve closes - IVC
49>Exhaust Valve Opens - EVO
-1>Exhaust Valve Closes - EVC
115>Exhaust Centerline - ECL
3>Overlap

Cam Motion lobes

LS1 BU

iTrader: (13)

I thought if your advancing the cam more than 4 degrees that the cam is to big and your compensating for it.

PREDATOR-Z

That is why I gave the specs I did.

Personally I prefer 0 advance. Advance and retard can be done via testing at the timing chain.
But if you run a non-adjustable, then the grind is the way.

DAPSUPRSLO

iTrader: (14)

Just like I told Rob, don't let the numbers fool you. LSM suggested a cam for my buddies sb2 400" motor with 5 degrees advance in it. I would certainly hate to think that they don't know what they're doing, he he.

Fact is if i use a smaller intake lobe to maintain the same IVC and pull back the ICL of the cam I will have to use an even bigger exhaust lobe to maintain the same amount or similar amount of overlap, or tighten up the lobe separation angle which will not open the exhaust valve like I want it opened in this cam.

DAPSUPRSLO

iTrader: (14)

What are the .006 and .200 numbers for this cam?

DAPSUPRSLO

iTrader: (14)

For ***** and giggles I just ran the numbers on Rob's old GT cam. My cam will only open the exhaust valve 1 degree sooner at .006 and 5.5 degrees sooner at .050 (his sheet does not have any at .200 numbers for the GT Cam) then the GT cam. IVC will be 5 degrees sooner in my cam at .050 and 4 degrees sooner at .006. There will be an additional 23 degrees of overlap at .006 and 26.5 at .050; however, don't let that overlap increase fool you that much considering the fact that the 224/230 cam i've recomended only has 3 degrees at .050 and 54 at .006.

Remember guys, he wants a similar power peak of 5800-5900 as my previous cam, but has to do so with stock exhaust.

gollum

iTrader: (1)

My cam was picked by More Performance Inc. using his expensive computer software program for the mods I have in sig. Car will rev to 7000 easy.

DAPSUPRSLO

iTrader: (14)

That's the cam i actually originally suggested but since I wanted to use XFI lobes for his cam I was stuck with the 230 exhaust lobe.

Oh, also I orignally suggested a 224/228 on a 111, not a 112 like you have. Put it back on a 112 to keep the overlap down a little.

Something I just noticed is that you indicated the cam had 4 degrees advance for a 106icl. Since you have a 112 lsa 4 degrees advance would yield a 108icl. Do you have 4 or 6 degrees of advance?

gollum

iTrader: (1)

My mistake! It is 108icl.

1CAMWNDR

iTrader: (21)

Too bad they do not have a 226° XFI lobe. with say .610" lift. I like the slightly larger 224°/.600" exhaust lobe's duration @.006" than the shorter quicker 224°/.609" intake lobe. I wonder if I can get a cam with all 224°/.600" exhaust lobes?

Sharpe

iTrader: (7)

Lurk.