Cam installed - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

4xchamp · 04-17-2010, 02:16 PM

Finished my LS3 cam install today .
Fired right up , no CEL , good rock at 600 rpm idle . Car is bone stock except for opened up oem air box . I do feel the valvetrain is slightly louder .
It feels like it pulls better and runs more quickly to the redline . I ran up a steep hill , 4th gear 1000 -1100 rpm with no bucking . Car is very driveable .
The Thunder Racing cam is ( no secrets here ) 224/242 610/613 115+3 and is a collaborative effort between , Thunder , C5 member Pat ADM " FreemaSSon " and myself .
The guys at Thunder were good to deal with and when a slight dilemma arose they attempted to assist immediately , however being as resourceful as we are and with Thunder's input all proceeded smoothly .
Next weekend I'm visiting the same dyno I baselined at last month to tune it .
Next are headers/cats , then gears and then ??

csjcsj · 04-17-2010, 02:19 PM

Gain in HP. Need numbers

redsap05 · 04-17-2010, 02:21 PM

is the intake on a xfi lobe?

4xchamp · 04-17-2010, 02:37 PM

Quote:

Originally Posted by csjcsj

Gain in HP. Need numbers

Like I said , next weekend .

4xchamp · 04-17-2010, 02:38 PM

Quote:

Originally Posted by redsap05

is the intake on a xfi lobe?

It's a Comp Cam custom grind .
What's the significance of an xfi lobe ?

matt d. · 04-17-2010, 03:06 PM

Both those intake and exhaust are xfi lobes.

4xchamp · 04-17-2010, 03:38 PM

Quote:

Originally Posted by matt d.

Both those intake and exhaust are xfi lobes.

How do you know this and what is an xfi lobe .
I'm noticing increased rocker arm noise , slight clicking not like a solid roller but definitely noticeable .
I did replace springs , retainers and pushrods .

silverfox · 04-17-2010, 04:27 PM

Those stock rocker arms will come apart. There is no snapring on the end of the shaft as in aftermarket ones. I had them come apart on a run at the dragstrip and ended my day. No engine damage but those little rollers go everywhere in the engine. Redid with comp cams truniun upgrade kit and all is ok for now. Have the mast black label roller rockers on order.

BTW; the offset intake rockers were the ones that failed

ron10 · 04-17-2010, 04:31 PM

i would like to hear some video.

4xchamp · 04-17-2010, 04:39 PM

Quote:

Originally Posted by silverfox

Those stock rocker arms will come apart. There is no snapring on the end of the shaft as in aftermarket ones. I had them come apart on a run at the dragstrip and ended my day. No engine damage but those little rollers go everywhere in the engine. Redid with comp cams truniun upgrade kit and all is ok for now. Have the mast black label roller rockers on order.

BTW; the offset intake rockers were the ones that failed

I think mine are ok , it's not skipping or doing anything strange . The sound is minimal , I'm just wondering why a hydraulic valvetrain would sound like this .
I've had Cranes & Crowers come apart In offshore race engines .
They can only take so many cycles of abuse . That's why the well financed teams replace that stuff every race and we glue magnets everywhere .
I'll post some video later but I need to figure out how to do it .

freemaSSon · 04-17-2010, 04:54 PM

XFI is the LOBE design and refers to the RAMP RATE on the lobes.

I have ran XFI, K and L lobes and the stock rockers are no more prone to failure with anyone or the other.

The stock rockers are CLEARLY not designed for these agressive ramp rates but failures are more uncommon than is being conveyed here. Harland Sharp and Comp both offer a VERY reasonable solution with SEALED needle bearing stockers that ELEMINATE this potential hazard.

Fanfreakingtastic to hear it's all together brother......

matt d. · 04-17-2010, 04:55 PM

I know because I looked in my comp master reference guide, xfi lobe is just one of many custom lobe families that comp has. The duration is the same but thunder racing added .001" lift to there advertised lift numbers which alot of companies do to try and throw people off looking in a reference guide. But you can take that cam and have it cam doctored and it will be within the tolerence of 3015 intake lobe and a 3038 exhaust lobe. That is all it is, I would say 98% of all "custom cams" that people sell for the LS engines is going to be from comp cams. The most common used lobes are going to be the xtreme RPM, XFI, XE-R, and LSK/LSL.

2010 SSRS · 04-17-2010, 05:03 PM

cool

Russell James · 04-17-2010, 05:37 PM

Are any of Comps lobe styles considered quieter?

On the rocker thing, cheap insurance is to use a magnetic drain plug. You'll know pretty easy if any needle bearings have come out.

04-17-2010, 02:16 PM	#1
4xchamp MURC 666 Drives: 69 Pace Car 68 Camaro Restomod 81 Z Join Date: Jan 2010 Location: New England , U.S.A. Posts: 480	Cam installed Finished my LS3 cam install today . Fired right up , no CEL , good rock at 600 rpm idle . Car is bone stock except for opened up oem air box . I do feel the valvetrain is slightly louder . It feels like it pulls better and runs more quickly to the redline . I ran up a steep hill , 4th gear 1000 -1100 rpm with no bucking . Car is very driveable . The Thunder Racing cam is ( no secrets here ) 224/242 610/613 115+3 and is a collaborative effort between , Thunder , C5 member Pat ADM " FreemaSSon " and myself . The guys at Thunder were good to deal with and when a slight dilemma arose they attempted to assist immediately , however being as resourceful as we are and with Thunder's input all proceeded smoothly . Next weekend I'm visiting the same dyno I baselined at last month to tune it . Next are headers/cats , then gears and then ?? __________________ Guys hoarding their Camaros are depriving some youngster the opportunity to restore it 25 years from now . Drive it like you stole it , let the next guy baby it !

04-17-2010, 02:19 PM	#2
csjcsj Drives: 2010 Camaro SS/RS 6spd Join Date: Sep 2009 Location: Jefferson, Ga Posts: 4,399 View My Garage	Gain in HP. Need numbers __________________

04-17-2010, 04:27 PM	#8
silverfox Drives: 2010 camaro ss Join Date: Jun 2009 Location: portsmouth,va. Posts: 502 View My Garage	Those stock rocker arms will come apart. There is no snapring on the end of the shaft as in aftermarket ones. I had them come apart on a run at the dragstrip and ended my day. No engine damage but those little rollers go everywhere in the engine. Redid with comp cams truniun upgrade kit and all is ok for now. Have the mast black label roller rockers on order. BTW; the offset intake rockers were the ones that failed Attached Images Last edited by silverfox; 04-17-2010 at 04:29 PM. Reason: more info

04-17-2010, 04:54 PM	#11
freemaSSon Pat @ ADM PERFORMANCE Drives: CGM SS/RS M6 Join Date: Aug 2009 Location: Prosper, TX Posts: 506	XFI is the LOBE design and refers to the RAMP RATE on the lobes. I have ran XFI, K and L lobes and the stock rockers are no more prone to failure with anyone or the other. The stock rockers are CLEARLY not designed for these agressive ramp rates but failures are more uncommon than is being conveyed here. Harland Sharp and Comp both offer a VERY reasonable solution with SEALED needle bearing stockers that ELEMINATE this potential hazard. Fanfreakingtastic to hear it's all together brother...... __________________ "old age and treachery will always overcome youth and ambition" author unknown "There are two types of racers: cheaters...and losers." Smokey Yunick

04-17-2010, 05:03 PM	#13
2010 SSRS Drives: 3 V8 Camaros Join Date: May 2009 Location: The Ocean State Posts: 111,186 View My Garage	cool __________________ Jannetty Racing JRE Street Package

04-17-2010, 02:21 PM	#3
redsap05 Drives: 2005 pontiac gto Join Date: Jul 2008 Location: akron oh Posts: 174	is the intake on a xfi lobe?

04-17-2010, 03:06 PM	#6
matt d. Drives: 1998 Z28 Join Date: Oct 2009 Location: houston, Denton Posts: 61	Both those intake and exhaust are xfi lobes.

04-17-2010, 04:31 PM	#9
ron10 Drives: 2010 2SS IOM L99 Join Date: Jan 2010 Location: LOUISVILLE,KY.. Posts: 7,545	i would like to hear some video.

04-17-2010, 04:55 PM	#12
matt d. Drives: 1998 Z28 Join Date: Oct 2009 Location: houston, Denton Posts: 61	I know because I looked in my comp master reference guide, xfi lobe is just one of many custom lobe families that comp has. The duration is the same but thunder racing added .001" lift to there advertised lift numbers which alot of companies do to try and throw people off looking in a reference guide. But you can take that cam and have it cam doctored and it will be within the tolerence of 3015 intake lobe and a 3038 exhaust lobe. That is all it is, I would say 98% of all "custom cams" that people sell for the LS engines is going to be from comp cams. The most common used lobes are going to be the xtreme RPM, XFI, XE-R, and LSK/LSL.

04-17-2010, 05:37 PM	#14
Russell James Drives: '15 SS 1LE, '69 Z28 drag car Join Date: Dec 2009 Location: Mich Posts: 4,482	Are any of Comps lobe styles considered quieter? On the rocker thing, cheap insurance is to use a magnetic drain plug. You'll know pretty easy if any needle bearings have come out. Last edited by Russell James; 04-18-2010 at 08:51 AM.

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