TPI Comp Cam Q
Thread Starter
Team Owner
Joined: Feb 2006
Posts: 24,460
Likes: 7
From: sw Ohio
TPI Comp Cam Q
I have a Comp Cam with a .520" lift, is this too much for an L98? I have magnaflow heads with upgraded valve springs that are rated at either .550 or .600 i'll have to check. I dont want it to sound like i've got a race car but a little choppy is nice. I have no idea what this cam would sound like.
Also my goal is to get to about 300 RWHP and keep the TPI.
BTW here are the stats on that cam...
Cam Style: Hydraulic flat tappet
Basic Operating RPM Range: 2,000-6,000
Intake Duration at 050 inch Lift: 224
Exhaust Duration at 050 inch Lift: 231
Duration at 050 inch Lift: 224 int./231 exh.
Advertised Intake Duration: 268
Advertised Exhaust Duration: 280
Advertised Duration: 268 int./280 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.520 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.515 in.
Valve Lift with Factory Rocker Arm Ratio: 0.520 int./0.515 exh. lift
Lobe Separation (degrees): 113
Also my goal is to get to about 300 RWHP and keep the TPI.
BTW here are the stats on that cam...
Cam Style: Hydraulic flat tappet
Basic Operating RPM Range: 2,000-6,000
Intake Duration at 050 inch Lift: 224
Exhaust Duration at 050 inch Lift: 231
Duration at 050 inch Lift: 224 int./231 exh.
Advertised Intake Duration: 268
Advertised Exhaust Duration: 280
Advertised Duration: 268 int./280 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.520 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.515 in.
Valve Lift with Factory Rocker Arm Ratio: 0.520 int./0.515 exh. lift
Lobe Separation (degrees): 113
Last edited by Demonic85; Feb 9, 2008 at 12:12 AM.
Drifting
Joined: Nov 2005
Posts: 1,361
Likes: 0
From: Downriver Mi.
I'm running the same cam, Comp xfi 268,but did the lt1 intake swap with heads at the same time,runs great on jackstands,waiting for a chip and the snow to stop,then i'll have a better idea,the cam does not seem too radical IMO, also I think those specs are with 1.6 rockers.
Last edited by MR NICE; Feb 9, 2008 at 05:47 AM.
Instructor
Joined: Sep 2006
Posts: 133
Likes: 0
From: Mt Pleasant Michigan
Mr Nice
I looked this cam up on Summit and it didn't say anything about 1.6 Rockers, Comp Cams specs say with stock rockers, but there Camquest says 1.6 in its notes. I was wondering the same thing.
This is the Cam I am looking at for my 383 LT1 intake, build for my 85, any new info, have you gotten a tune yet?
I know the Snow hasn't left yet
Joe
I looked this cam up on Summit and it didn't say anything about 1.6 Rockers, Comp Cams specs say with stock rockers, but there Camquest says 1.6 in its notes. I was wondering the same thing.
This is the Cam I am looking at for my 383 LT1 intake, build for my 85, any new info, have you gotten a tune yet?
I know the Snow hasn't left yet
Joe
Last edited by mgbss; Feb 17, 2008 at 09:35 PM.
Pro
Joined: Feb 2005
Posts: 658
Likes: 1
From: Centerville OH
The CompCams XFI series of cams are designed to use 1.6:1 rockers. You may want to double check the cam part number on Comp's website to verify whether or not it is an XFI cam. Also, you should consider contacting the manufacturer of your heads to get an idea of the valve lift at which peak flow occurs. A cam with .520 lift isn't going to give you good results if you have heads that reach peak flow at .450, for example.
Also, you didn't state if your TPI is stock or upgraded. If you have a stock unported TPI, I seriously doubt you will reach your 300 rwhp goal. IMO, this cam will not be a good match for a TPI, especially if it's stock. The cam is too big for the limited rev range of a TPI.
Also, you didn't state if your TPI is stock or upgraded. If you have a stock unported TPI, I seriously doubt you will reach your 300 rwhp goal. IMO, this cam will not be a good match for a TPI, especially if it's stock. The cam is too big for the limited rev range of a TPI.
Drifting
Joined: Nov 2005
Posts: 1,361
Likes: 0
From: Downriver Mi.
The CompCams XFI series of cams are designed to use 1.6:1 rockers. You may want to double check the cam part number on Comp's website to verify whether or not it is an XFI cam. Also, you should consider contacting the manufacturer of your heads to get an idea of the valve lift at which peak flow occurs. A cam with .520 lift isn't going to give you good results if you have heads that reach peak flow at .450, for example.
Also, you didn't state if your TPI is stock or upgraded. If you have a stock unported TPI, I seriously doubt you will reach your 300 rwhp goal. IMO, this cam will not be a good match for a TPI, especially if it's stock. The cam is too big for the limited rev range of a TPI.
Also, you didn't state if your TPI is stock or upgraded. If you have a stock unported TPI, I seriously doubt you will reach your 300 rwhp goal. IMO, this cam will not be a good match for a TPI, especially if it's stock. The cam is too big for the limited rev range of a TPI.
Last edited by MR NICE; Feb 17, 2008 at 08:56 PM.
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Drifting
Joined: Feb 2003
Posts: 1,976
Likes: 2
From: San Antonio Texas
I believe Jeremy is still running a 350" motor. Like was said above,the cam would probably be a bit too big for a TPI intake. It's bigger than a "Hot Cam" for instance. Hopefully the BBk intake will be out soon, at a good price.
Thread Starter
Team Owner
Joined: Feb 2006
Posts: 24,460
Likes: 7
From: sw Ohio
There are 3 XFI cams for early C4's
.477/.472 (low end torque, crossfire)
.499/.493 (Low end to mid range torque, stock TPI)
.520/.515 (the one I got)
I figured the bigger the cam, the better. Still learning guys... What do you think about this one?
Lunati Voodoo
Advertised Duration : 256°/262°
Duration @ .050 IN/EX : 213°/219°
Gross Valve lift IN/EX .454''/.468''
LSA and ICL 112/108
RPM Range: 1000-5500
Last edited by Demonic85; Feb 18, 2008 at 12:26 AM.
Pro
Joined: Jan 2003
Posts: 515
Likes: 3
From: newark DE
i dont think that cam is too big... theres a guy on thirdgen.org running a roller XFI cam that specs out at 230/236 with much higher lift on a stock plenum/runners, edelbrock base TPI setup. car also has AFR 195 heads. made 330+rwhp
so depending on your heads and intake setup, id say use the one you have
so depending on your heads and intake setup, id say use the one you have
Team Owner
Joined: Jan 2003
Posts: 20,306
Likes: 241
From: Summerland B.C. Canada
Comp cam CS XE262H-14 Lift In .464 Ex .470 Duration @50 In .218 Ex .224
Sounds nice at idle and lots of fun under 5500 rpm
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,063
From: altered state
St. Jude Donor '05
Im still not clear on what heads youre using...
The 256 Voodoo will idle about like a stocker but will make excellent torque. Used that in a friends Iroc 350 build awhile back
-0 Deck
-10:1 compression ration
-Edelbrock performer heads with a little work
-Ported TPI
-Headers
-TJ Wong tune
1st and 2nd gear you can smoke the tires all day, smooth idle, passes smog with no problem. May be able to step up to a 262 as Agent said.
The 256 Voodoo will idle about like a stocker but will make excellent torque. Used that in a friends Iroc 350 build awhile back
-0 Deck
-10:1 compression ration
-Edelbrock performer heads with a little work
-Ported TPI
-Headers
-TJ Wong tune
1st and 2nd gear you can smoke the tires all day, smooth idle, passes smog with no problem. May be able to step up to a 262 as Agent said.
