Stealth Cams
TECH Senior Member
Joined: Nov 2001
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Originally Posted by Gr8WhtLS1
Stealth II, moron! It has more duration on the intake with a little less lift 224/220 instead of 220/220(known as a split pattern camshaft)so it idles great.
I wouldn't bother swapping. They are very close...
TECH Senior Member
Joined: Nov 2001
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From: Troy, AL
Ok...
I do have some sound clips. I just never got around to posting them. I'll get 'em up.
I *think* that the .571 intake lift listed on MTI's site is incorrect. Mine was supposed to be .581 and I don't see any reason that they would have changed it. Also, both the 220 and 224 XE-R lobes are listed to be .581 unless they've changed that recently.
The Stealth I cam would be a better choice for a stock exhaust manifold car. The Stealth II NEEDS a great flowing exhaust to showcase it's advantages.
The "guy" at MTI was probably a salesperson. Sorry Wayne (guy at MTI that you probably spoke to), but the Stealth II has an LSA of 116 which pretty much makes up for the 4 degrees increase in duration. IMO, if you listened to my car with the SSII (sounds stock at the tailpipe) and swapped cams and then listened to the SSI in my car...you would not be able to discern any difference. The cams are just sooooooooooo close. A little duration here, a little LSA there...it all pretty much equals out in the idle department.
Valvtrain noise, YES there is valvetrain noise with the Stealth cams...or ANY cam that uses aggressive lobes. There's just no getting around it. And you don't have to open the hood to hear it either. However, I don't want to give you the idea that it's loud...it's not, but it IS there. You'll notice it most when the car is idling next to a concrete wall and you have your window down (such as at a drivethrough window.)
I do have some sound clips. I just never got around to posting them. I'll get 'em up.
I *think* that the .571 intake lift listed on MTI's site is incorrect. Mine was supposed to be .581 and I don't see any reason that they would have changed it. Also, both the 220 and 224 XE-R lobes are listed to be .581 unless they've changed that recently.
The Stealth I cam would be a better choice for a stock exhaust manifold car. The Stealth II NEEDS a great flowing exhaust to showcase it's advantages.
The "guy" at MTI was probably a salesperson. Sorry Wayne (guy at MTI that you probably spoke to), but the Stealth II has an LSA of 116 which pretty much makes up for the 4 degrees increase in duration. IMO, if you listened to my car with the SSII (sounds stock at the tailpipe) and swapped cams and then listened to the SSI in my car...you would not be able to discern any difference. The cams are just sooooooooooo close. A little duration here, a little LSA there...it all pretty much equals out in the idle department.
Valvtrain noise, YES there is valvetrain noise with the Stealth cams...or ANY cam that uses aggressive lobes. There's just no getting around it. And you don't have to open the hood to hear it either. However, I don't want to give you the idea that it's loud...it's not, but it IS there. You'll notice it most when the car is idling next to a concrete wall and you have your window down (such as at a drivethrough window.)
TECH Senior Member
Joined: Mar 2004
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From: BFE
Valvetrain noise, YES there is valvetrain noise with the Stealth cams...or ANY cam that uses aggressive lobes. There's just no getting around it. And you don't have to open the hood to hear it either. However, I don't want to give you the idea that it's loud...it's not, but it IS there. You'll notice it most when the car is idling next to a concrete wall and you have your window down (such as at a drivethrough window.)
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Joined: Nov 2001
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From: Troy, AL
I don't think it would help that much really though it's not like I've done this with no other changes with this setup. I once went from stock rockers in the 422 I had to Jesels and didn't notice any difference that I recall. Granted, there was a cam change in the process (went from an R1 to an S1.)
I have the Stealth I in my vette (for almost a year now!), and I have virtually no valvetrain noise at all (even with the stock rockers). MTI installs double springs in the valvetrain for the Stealth Cams. After the cam install last year, there was a slight ticking from the valvetrain, but that has now diminished to a level where it's hard to hear it at all! 
Idle on my is at 800rpms and silky smooth, only thing you notice is a tiny tiny bit of door shake and that's if you're looking! I have Ti Z06 mufflers so the car sounds stock, idles stock, but sure does'nt run stock!!!
Idle on my is at 800rpms and silky smooth, only thing you notice is a tiny tiny bit of door shake and that's if you're looking! I have Ti Z06 mufflers so the car sounds stock, idles stock, but sure does'nt run stock!!!
TECH Regular
Joined: Feb 2003
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From: Pasadena, CA
Originally Posted by Colonel
The Stealth I cam would be a better choice for a stock exhaust manifold car. The Stealth II NEEDS a great flowing exhaust to showcase it's advantages.
P.S. Stock heads
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Verdad Gallardo TECH Senior Member
Joined: Nov 2001
Posts: 9,246
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From: Troy, AL
"catted Y, Magnaflow catback"
The catted Y is fine so long as the cats are really high flowing ones. The Y-pipe needs to be of good size too. A 3" into a 4" collector does great! A 3.5 " collector will also work just fine if you're not into overkill like I am.
Magnaflow catback? I don't know how well that particular cat-back flows so I can't guess. Better ask a few people who've dynoed it against an open cuttout (a cuttout would certainly suffice.)
The catted Y is fine so long as the cats are really high flowing ones. The Y-pipe needs to be of good size too. A 3" into a 4" collector does great! A 3.5 " collector will also work just fine if you're not into overkill like I am.
Magnaflow catback? I don't know how well that particular cat-back flows so I can't guess. Better ask a few people who've dynoed it against an open cuttout (a cuttout would certainly suffice.)
On The Tree
Joined: Aug 2003
Posts: 100
Likes: 0
From: Arlington, Tx
Originally Posted by soliari
Interested in a sub 220 duration custom comp cam that made 397/391??? I can post a dynograph ....
Can you please post the dynographs and the specs of the cam? I could for sure be interested in a cam that can pull these numbers.
P Mack, the 918 handle my 231/237 cam so yes I would say they can handle the Stealth cams. Of course, next time I will install some stock dia. duals so I can swap out any cam I want.
Off idle torque, I am not sure on.
Off idle torque, I am not sure on.
Launching!
Joined: Feb 2002
Posts: 238
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From: Albuquerque, NM
Originally Posted by 2k2blkss
since no one else responded to your post I'll bite...
Can you please post the dynographs and the specs of the cam? I could for sure be interested in a cam that can pull these numbers.
Can you please post the dynographs and the specs of the cam? I could for sure be interested in a cam that can pull these numbers.
216/216 @ .050
.588/.588 w/ 1.7 rr
114+2 LSA
112 intake center line
The blue line represents the cam with the following mods (basically full bolt-ons):
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The red line is the same as above but thru manifolds, ORY, and cutout
Notice the tip in issue ... most noticable on the Torque graph. You can also see there are several flat spots in the graph as well. I think that comes from the ported MAF ends causeing the computer to go into a Burst Knock condition. The reason I think it's Burst Knock is because the PCM is reporting no knock retartd throughout the run, but I do notice dips (6 degrees or so) in the timing curve. I don't think there's much more power left in the cam (without heads) due to tuing, but I think I can further smooth the timing and torque curves.
Last edited by soliari; Apr 2, 2004 at 02:56 PM.
On The Tree
Joined: Aug 2003
Posts: 100
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From: Arlington, Tx
those are awesome numbers for such a small cam!!! How does it idle? (could it pass as stealthy?)Also, what headers are you running?
I'm assuming its a M6 car with a LS6 intake
Again, very sweet!!!
Launching!
Joined: Feb 2002
Posts: 238
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From: Albuquerque, NM
It idles very, very smoothly at ~850 rpm. Most don't know I have a cam except for the light valvetrain noise. Around town driving is a dream and I usually get 20+ city mpg with 29+ hiway mpg.
The headers are Jet-Hot.
And yes, it's a M6 and 2002 YM so it has the LS6 intake.
The headers are Jet-Hot.
And yes, it's a M6 and 2002 YM so it has the LS6 intake.