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Pics of Heads and cam Install
This is a discussion on Pics of Heads and cam Install within the Member's Rides forums, part of the Off - Topic / Discussion forums category; The girlfriend looks busy!...
07-22-2008, 10:04 PM #1
Pics of Heads and cam Install
The girlfriend looks busy!
07-22-2008, 10:11 PM #2
Nice! Always great to have a girl willing to work on the car. What heads cam pack did you go with?
07-22-2008, 10:15 PM #3
07-22-2008, 11:01 PM #4
haha i like the first pic. inside the engine bay
07-22-2008, 11:07 PM #5
07-23-2008, 03:45 AM #6
- Join Date
- Dec 2005
- Laurel, Maryland
2000 Grand Prix GTP
- 2000 Trans Am WS6 M6
07-28-2008, 01:00 PM #7
Holy hell. 108?? with 620/620?
Where are you expecting this power? Is this for the strip? That is a large cam.
07-28-2008, 01:12 PM #8
- Join Date
- Aug 2005
- Texas Department of Corrections
- Retired Outlaw Sum Bitch
07-28-2008, 03:36 PM #9
I just wanted a mean cruising machine.
07-29-2008, 05:20 PM #10
What's the full spec's on the cam? Am I the only one here who thinks this cam is very large for a 346??? ... and is not going to make anything close to good power at ..... 2500 RPm for the street??? I am not knocking you, this just seems like a very large LSA cam, very High lift cam to be putting in a stock cube LS1. Is this a stock Cubed LS1?
What is the duration on this cam? I'm seeing Lift and LSA. Anything else?
07-29-2008, 08:47 PM #11
F.O 1,2,7,2,6,5,4,3 108 Lobe Separation Angle
Intake opens 39 Exhaust closes 43
Intake closes 75 Exhaust opens 79
Valve Lift .620/.620 @.050
@ .050 Tappet Rise
Intake opens 9 Exhaust closes 13
Intake closes 45 Exhaust opens 49
Duration Intake: 234 Duration Exhaust: 242
Lobe Lift Intake: .365 Lobe Lift Exhaust: .365
Intake Center Line: 108 Rocker Arm Ratio: 1.70/1
Hope thats enough info for you.
07-31-2008, 08:07 AM #12
that's a ton of overlap.....good luck tuning that.
07-31-2008, 11:06 AM #13
OMG is that right? 294/302 duration at 0.050?? That must be advertised dur, there is no way a cam that big could be hydraulic, it's power band would be way too high.
What is the duration at .050? As far as it goes, anything tighter than 110 LSA is typically race-only territory.
With that kind of overlap, there is no way the closed loop fueling system in the PCM can work. All of that fresh air moving out of the exhaust from overlap will saturate the O2s reading a hugely false lean. The PCM will respond by adding a crapload of fuel to try and get it "not lean", but it won't be able to and the end result is that it will run WAY rich, regardless of tuning (in closed loop). It will run rich enough that if you leave it sitting idling while warm over time it could actually was the cylinders out (and constantly foul plugs).
I would not run a cam of this sort in anything but a race car seeing as there is no real way to tune it without a 5-gas analyzer for cruise areas (which race cars do not need). The wideband will read falsely lean from the overlap just like the factory narrowbands will. This setup needs Alpha-N type fueling control, but the rest of the setup doesn't seem to match. That LS6 intake will be spent by 6-6200 so it's not the best fit for that arrangement either.
I'm not trying to give you a hard time and I'm certainly not talking smack, I'm just relating experience here.
07-31-2008, 11:14 AM #14
That bottom set is @ .50 so it's a 234/242 .620/.620 on a 108. Did you check piston to valve clearance? That's 22 degrees overlap at .50 or 82 degrees at advertised. In comparison my 228R has zero degrees overlap @ .50. That cam is going to be rough to cruise around in I bet.
07-31-2008, 12:16 PM #15
Well, the powerband part of my post above won't be so relevant, but the rest of it here will be:
The only real option here is open loop tuning. Because of issues with the F-body (and vette) PCMs, open loop tunes have to be adjusted periodically to maintain commanded fueling. As long as the poster knows this and knows how to correct, I guess he could get it done, but it's gonna give him fits getting it straight. I'd do the SCR/DCR calcs too to figure out what the DCR will be on a cam like that. Also, as Orion noticed, if I had to make a guess off of the top of my head (which may be wrong, but it's my feeling), I'd say you will have to do a little flycutting of valve reliefs into the pistons.
Best of luck.
07-31-2008, 09:12 PM #16
08-02-2008, 12:13 PM #17
Good! I am glad to hear that it got up and moving with no trouble.
Cams can be funny animals. Sometimes the giant ones end up loving to idle.
Spend your free time in the HPT forum reading up. It's hard to see the big picture at first, but it comes together over time.
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