broken timing chain on LS2

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Jul 2, 2011 | 06:32 PM

truckplay

Thread Starter

Melting Slicks

Joined: Oct 2010

Posts: 2,220

Likes: 16

From: Sugarhill Ga

broken timing chain on LS2

I broke the timing chain on my 05 this morning under accellaration. I am looking for advice on Chain set, cam ... Is a gear to gear timing set available ( I love the sound ) I am running 1 7/8 headers, uncatted Z06 exhaust, ported fast & ported t-body, Varaam & 25% underdrive pulley (i believe this is the cause of the failure)

any suggestions or links would be appreciated.

Jul 2, 2011 | 06:53 PM

Gering

Tolero Apto Victum

Joined: Jul 2007

Posts: 9,669

Likes: 37

From: Woodlands TX

Quote:

Originally Posted by truckplay

What brand of underdrive pulley? There have been a few timing chains that have broke while using a certain brand of UP's.

Jul 2, 2011 | 06:57 PM

truckplay

Thread Starter

Melting Slicks

Joined: Oct 2010

Posts: 2,220

Likes: 16

From: Sugarhill Ga

slp 25%. i was told when i bought it, beacuse my oe "wabbled" that it could happen on DOWNSHIFTS not up shifts

Jul 2, 2011 | 07:12 PM

timd38

Race Director

Joined: Aug 2005

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From: Hudson WI

NCM Sinkhole Donor

Katech C5R chain appears to be the best.

http://store.katechengines.com/c5-r-...chain-p30.aspx

Jul 2, 2011 | 07:50 PM

Gering

Tolero Apto Victum

Joined: Jul 2007

Posts: 9,669

Likes: 37

From: Woodlands TX

Quote:

Originally Posted by truckplay

slp 25%. i was told when i bought it, beacuse my oe "wabbled" that it could happen on DOWNSHIFTS not up shifts

Sir,

Please see my 2nd post, there are 3 threads that may help you out.

http://forums.corvetteforum.com/c6-c...ey-issues.html

Jul 2, 2011 | 08:47 PM

truckplay

Thread Starter

Melting Slicks

Joined: Oct 2010

Posts: 2,220

Likes: 16

From: Sugarhill Ga

how about Katech

does anyone have any knowledge of the C5r timing chain & Trac camshaft?

Jul 2, 2011 | 09:51 PM

truckplay

Thread Starter

Melting Slicks

Joined: Oct 2010

Posts: 2,220

Likes: 16

From: Sugarhill Ga

thank you. looks like i'm leaning to the katech with their cam. dont know if i need a kit with lifters and pushrods though. also i am gonna want to pin the crank. i didn't do it when i changed the pulley and don't remember why. i am so mad, the car only has 25k & I never track the car, only high speed runs on lonely roads

Jul 2, 2011 | 10:16 PM

Gering

Tolero Apto Victum

Joined: Jul 2007

Posts: 9,669

Likes: 37

From: Woodlands TX

When you have all of your work done, take a look at installing an ATI underdrive pulley.

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Jul 3, 2011 | 01:08 AM

DSOMC6

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Joined: Dec 2005

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From: God's Country, ID

Quote:

Originally Posted by truckplay

I just installed the C5R timing chain to avoid the problem you have encountered. If you are going with a cam that has a higher lift than the OEM cam I would replace the lifters, add hardened push rods and dual valve springs.

Jul 3, 2011 | 07:02 AM

#10

truckplay

Thread Starter

Melting Slicks

Joined: Oct 2010

Posts: 2,220

Likes: 16

From: Sugarhill Ga

thanks i will. i emailed a corvette shop by my house and am waiting on a reply. hoping to get the car running this week.

Jul 3, 2011 | 07:10 AM

#11

timd38

Race Director

Joined: Aug 2005

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From: Hudson WI

NCM Sinkhole Donor

I don't know exactly when it appended, but GM changed to a stronger chain when the went from LS1 to LS2. Since you have an 05, maybe it came with the lighter chain and new stock LS2/3 chain will be fine.

Just a guess.

Jul 3, 2011 | 07:14 AM

#12

truckplay

Thread Starter

Melting Slicks

Joined: Oct 2010

Posts: 2,220

Likes: 16

From: Sugarhill Ga

thanks, i am thinking of doing the katech c5r, seems very popular and haven't heard about any fitment issues as in double rollers, with a new cam kit.

thanks

Jul 3, 2011 | 11:25 AM

#13

Craigster05

Safety Car

Joined: Dec 2005

Posts: 4,157

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From: North Carolina

St. Jude Donor '07-'08-'09-'11-'12

You are probably going to need valves too from the piston contact when the chain broke. Since you have to pull it apart anyway, here is the direction I went with my 06....wanst that expensive and the performance difference from the bolt on LS2 was nothing short of phenomenal:

http://forums.corvetteforum.com/c6-t...cam-specs.html

When I did it, these were the part numbers and cost...it actually cost me much less as I sold all takes offs and did my own labor, so in the end it cost me about $700.00 total.

2 - L92 Heads Part # 012582714 $379.90
8 - Offset Rocker Arms for L92 Part # 012569167 - $94.72
8 - Manley 2.165" L92 Intake Valves # MAN11620 - $111.92
8 - Manley 1.590" L92 exhaust valves# MAN11621 - $111.92
2 - Rocker Pedestals for L92 Part # 012600936 - $31.04
1 - ARP Bolt Set Part # ARP1343610 - $98.95
1 - L76 Bare Manifold # 012590124 - $224.75
1 - Patriot Extreme Gold Spring Set - $279.50
1 - GM Crank Seal # 012585673 - $18.36
1 - IWin Heavy Duty Rollermaster Chain #SD3SR602 $42.35

From ByunSpeed
1 - Powerbond Underdrive Pulley, Belt, Bolt Kit - $200

From CompCams
1- Comp Cam 228/232 114+2 LSA - $404.00

Total of $1997.41

Last edited by Craigster05; Jul 3, 2011 at 11:29 AM.

Jul 3, 2011 | 11:27 AM

#14

truckplay

Thread Starter

Melting Slicks

Joined: Oct 2010

Posts: 2,220

Likes: 16

From: Sugarhill Ga

i didn't think it was an interference engine.

Jul 3, 2011 | 12:25 PM

#15

Craigster05

Safety Car

Joined: Dec 2005

Posts: 4,157

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From: North Carolina

St. Jude Donor '07-'08-'09-'11-'12

Here's two 05s that I know of, and Ive never seen anyone break a chain that didnt destroy valves as well:

http://forums.corvetteforum.com/c6-c...-purchase.html

http://forums.corvetteforum.com/c6-t...now-c-o-w.html

After a chain failure, you'd have to pull everything apart just to be safe and sure. Either way, whether you got lucky or not, if it were me, I would take the opportunity to turn a negative experience into a positive one and rebuild with better parts to make her faster as well...but that's just me and I'll never claim to be the brightest bulb in the lamp

No matter what, best of luck, we'll hope for the best and hopefully you'll be back on the road soon.

Jul 3, 2011 | 01:55 PM

#16

CMY SIX

Safety Car

Joined: Feb 2007

Posts: 4,684

Likes: 107

From: Opelika Alabama

it don't matter what brand pulley, these engine's don't like them!

Jul 3, 2011 | 02:08 PM

#17

DSOMC6

Race Director

Joined: Dec 2005

Posts: 11,858

Likes: 107

From: God's Country, ID

Quote:

Originally Posted by CMY SIX

it don't matter what brand pulley, these engine's don't like them!

The small gain in power isn't worth the risk IMHO.

Jul 3, 2011 | 02:22 PM

#18

LS1LT1

Team Owner

Joined: Feb 2001

Posts: 27,251

Likes: 130

From: Short Hills, NJ

Quote:

Originally Posted by Craigster05

After a chain failure, you'd have to pull everything apart just to be safe and sure. Either way, whether you got lucky or not, if it were me, I would take the opportunity to turn a negative experience into a positive one and rebuild with better parts to make her faster as well...