Timing chain break again. How about a ls6 swap for cure..
04-25-2010, 10:47 AM
#1
Racer
Thread Starter
Timing chain break again. How about a ls6 swap for cure..
I just broke a Katech timing for the second time at Ra this weekend. Obviously there is a problem somewhere. I bought this car ;C5 ls1 w/ls6 heads ,intakes ,injectors ,comp cam and first time on track broke a katech chain. Bought another chain, had the heads reworked put it all back together verifying the aliment and everything was good. 4th day on track same thing. When I bought the car the motor had been rebuilt several time and it came with several different spare cams so I think I bought into this problem and the guy got tired of throwing stuff at the problem. Am tired of not finshing events so I have decided to swap the block this time to a ls6. Anyone have a lead on who is running specials on the motors. With the top end of my original motor already ls6 can I get away with just the short block or try and find a deal on a crate engine. Are the computers and harness compatible.
04-25-2010, 11:20 AM
#2
Team Owner
I just broke a Katech timing for the second time at Ra this weekend. Obviously there is a problem somewhere. I bought this car ;C5 ls1 w/ls6 heads ,intakes ,injectors ,comp cam and first time on track broke a katech chain. Bought another chain, had the heads reworked put it all back together verifying the aliment and everything was good. 4th day on track same thing. When I bought the car the motor had been rebuilt several time and it came with several different spare cams so I think I bought into this problem and the guy got tired of throwing stuff at the problem. Am tired of not finshing events so I have decided to swap the block this time to a ls6. Anyone have a lead on who is running specials on the motors. With the top end of my original motor already ls6 can I get away with just the short block or try and find a deal on a crate engine. Are the computers and harness compatible.
I swapped a LS1 to LS6 I forgot what chain I have.
04-25-2010, 01:37 PM
#3
Premium Supporting Vendor
We've never broken a C5-R chain in 10 years. That includes the 24 hours of Le Mans, Daytona, Spa, and 30-hour dyno durability tests. Since you've broken two, I've got to agree with you that there is a problem somewhere else. Do you transport the car in gear? What kind of damper do you have?
04-25-2010, 05:09 PM
#4
Racer
Thread Starter
We've never broken a C5-R chain in 10 years. That includes the 24 hours of Le Mans, Daytona, Spa, and 30-hour dyno durability tests. Since you've broken two, I've got to agree with you that there is a problem somewhere else. Do you transport the car in gear? What kind of damper do you have?
04-26-2010, 09:51 AM
#5
Melting Slicks
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Do you have to broken chains or did you throw them away?
If you still have them look and see of you have any stiff links, if you do then I would look at the balancer. The only ones to trust are stock or the ATI balancer with the softer rubber.
If your cam gear was hitting one of the cam cover bolts I would definatly find out why.
If you still have them look and see of you have any stiff links, if you do then I would look at the balancer. The only ones to trust are stock or the ATI balancer with the softer rubber.
If your cam gear was hitting one of the cam cover bolts I would definatly find out why.
04-26-2010, 11:44 PM
#7
Le Mans Master
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We've never broken a C5-R chain in 10 years. That includes the 24 hours of Le Mans, Daytona, Spa, and 30-hour dyno durability tests. Since you've broken two, I've got to agree with you that there is a problem somewhere else. Do you transport the car in gear? What kind of damper do you have?
04-19-2011, 11:19 PM
#8
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Very late to this thread, but Billy, I'll see your 2 broken timing chains at Road Atlanta and raise you 1. Yep, this weekend I broke my 3rd chain. My car is a '99FRC w/ an LS6-to-402 LS2 conversion from my previous '01Z in it. I started w/ the stock LS6 chain and broke it. Then replaced w/ the beefier LS2/LS7 chain, and broke that. And Sunday, I even managed to break the Katech chain. The first and third times were w/in mere feet of each other, exiting Turn 5...kinda freaky. I even knew exactly where to pull off track between T7 & T8 after coasting around T6 & T7.
Anyway, I had issues initially w/ the stock balancer "walking" itself forward on the crank, so I replaced it w/ a "Moto Blue LSx Underdrive Pulley" from RPM Outlet and pinned it to the crank. I believe this balancer is similar to (or maybe even the same as) the ASP and Power Bond ones. So, perhaps this is my issue? I sure hope so-- I'm ready to solve this thing or just give up and swap in an LS3 crate engine or something.
Billy and Rob, did you guys ever get to the bottom of your issues? Did you try an ATI pulley and that fixed it?
Thx,
Fred
Anyway, I had issues initially w/ the stock balancer "walking" itself forward on the crank, so I replaced it w/ a "Moto Blue LSx Underdrive Pulley" from RPM Outlet and pinned it to the crank. I believe this balancer is similar to (or maybe even the same as) the ASP and Power Bond ones. So, perhaps this is my issue? I sure hope so-- I'm ready to solve this thing or just give up and swap in an LS3 crate engine or something.
Billy and Rob, did you guys ever get to the bottom of your issues? Did you try an ATI pulley and that fixed it?
Thx,
Fred
04-20-2011, 08:05 AM
#9
Premium Supporting Vendor
Very late to this thread, but Billy, I'll see your 2 broken timing chains at Road Atlanta and raise you 1. Yep, this weekend I broke my 3rd chain. My car is a '99FRC w/ an LS6-to-402 LS2 conversion from my previous '01Z in it. I started w/ the stock LS6 chain and broke it. Then replaced w/ the beefier LS2/LS7 chain, and broke that. And Sunday, I even managed to break the Katech chain. The first and third times were w/in mere feet of each other, exiting Turn 5...kinda freaky. I even knew exactly where to pull off track between T7 & T8 after coasting around T6 & T7.
Anyway, I had issues initially w/ the stock balancer "walking" itself forward on the crank, so I replaced it w/ a "Moto Blue LSx Underdrive Pulley" from RPM Outlet and pinned it to the crank. I believe this balancer is similar to (or maybe even the same as) the ASP and Power Bond ones. So, perhaps this is my issue? I sure hope so-- I'm ready to solve this thing or just give up and swap in an LS3 crate engine or something.
Billy and Rob, did you guys ever get to the bottom of your issues? Did you try an ATI pulley and that fixed it?
Thx,
Fred
Anyway, I had issues initially w/ the stock balancer "walking" itself forward on the crank, so I replaced it w/ a "Moto Blue LSx Underdrive Pulley" from RPM Outlet and pinned it to the crank. I believe this balancer is similar to (or maybe even the same as) the ASP and Power Bond ones. So, perhaps this is my issue? I sure hope so-- I'm ready to solve this thing or just give up and swap in an LS3 crate engine or something.
Billy and Rob, did you guys ever get to the bottom of your issues? Did you try an ATI pulley and that fixed it?
Thx,
Fred
04-20-2011, 09:30 AM
#11
Melting Slicks
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I agree with Jason, check the most recent broken chain for stiff links, it's a tell tail sign of bad harmonics. These engines are violent around peak torque and you need a balancer that can handle that.
We had a LS7 that broke 2 chains with an ASP, Katech installed an ATI and 3 years later no issues.
We had a LS7 that broke 2 chains with an ASP, Katech installed an ATI and 3 years later no issues.
04-21-2011, 12:09 PM
#14
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04-21-2011, 03:05 PM
#15
Le Mans Master
I just checked the mod list on my new (to me) '01 Z06. Sure enough... Powerbond damper and LS2 timing set. What should I keep an eye on to make sure I don't break the chain? Is the failure mode that the damper walks off the crank?
04-21-2011, 03:34 PM
#16
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Probably not necessarily the damper walking off but rather what caused it. I am no expert, but I am just concerned that an imbalance caused the damper to loosen and how long I ran with it loose. But then, I spend a lot of time worrying about such things. 
04-21-2011, 06:31 PM
#17
Melting Slicks
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The only balancers that I've heard the come loose are the 05 LS2 balancers. I've snugged a few of them up by replacing the stock bolt with an APR balancer bolt. The later LS2's added a shim between the crank and the balancer to keep the balancer from spinning loose. Another option is to pin the balancer to the crank.
But this isn't an issue with the LS6's.
04-22-2011, 10:57 AM
#19
Tolero Apto Victum
Do you have to broken chains or did you throw them away?
If you still have them look and see of you have any stiff links, if you do then I would look at the balancer. The only ones to trust are stock or the ATI balancer with the softer rubber.
If your cam gear was hitting one of the cam cover bolts I would definatly find out why.
If you still have them look and see of you have any stiff links, if you do then I would look at the balancer. The only ones to trust are stock or the ATI balancer with the softer rubber.
If your cam gear was hitting one of the cam cover bolts I would definatly find out why.
05-10-2011, 09:19 AM
#20
Racer
Thread Starter
I did have the asp under drive pulley and would assume that was the culprit. I put in a new ls6 and tossed the asp in the garbage. If I were buying a used car and it already had that dampner on, my first mod would be to replace it.