double roller timing chain, what's the point???
Drifting
Joined: Feb 2006
Posts: 1,585
Likes: 15
From: New Hartford IA
The Rollmaster I reused from my h/c setup on my 383 broke two links in the center. I doubt it had more than 10k on it. Lucky I cought it during a oil change on the plug magnet. I now use the ktech single with new gm sprokets and the GMPP chain damper.
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
Wow, you are the second person I have seen have this issue with this setup. Do you know if the chain was an IWIS?
Drifting
Joined: Feb 2006
Posts: 1,585
Likes: 15
From: New Hartford IA
Yes it was an IWIS
So is the single Katech single chain, but I would hope it's of better quality. I posted about it a while ago on ls1 tech so you might have seen it over there.
Burning Brakes
Joined: Jul 2000
Posts: 1,134
Likes: 1
From: Arlington Texas
Was it a single or double roller Rollmaster?
Melting Slicks
Joined: May 2005
Posts: 3,394
Likes: 12
From: Leon Iowa
St. Jude Donor '06-'07-'08-'09
A weak chain or one thing a lot of guys don't check when installing new sprockets, sprocket alignment. If its off, it will induce a bending load in the chain and fatigue it. Design loads for chain are typically 10% of their load capability to ensure long life. Not sure what rating the engine designers use (GM, Ford, etc.) but that is the general rule of thumb.
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
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Drifting
Joined: Dec 1999
Posts: 1,541
Likes: 2
From: Raleigh NC
Add one more broken LS2 timing chain.
When I was FI'd my stock cam bolts loosened up. At that time I put on a new top ls2 gear and chain. I didn't touch the bottom gear. After maybe 3000 miles, I ditched the FI and did H/C with the same gear set. About 1000 miles later with 2 days of HPDEs the chain broke. What chain do I use now? LS2 with dampner? I didn't have a dampner before.
I haven't pulled the heads yet to assess the damage. I know I have several bent valves. I'm hoping I can slap on my LS6s heads and get some driving time in. I really don't want to do a new motor right now.
When I was FI'd my stock cam bolts loosened up. At that time I put on a new top ls2 gear and chain. I didn't touch the bottom gear. After maybe 3000 miles, I ditched the FI and did H/C with the same gear set. About 1000 miles later with 2 days of HPDEs the chain broke. What chain do I use now? LS2 with dampner? I didn't have a dampner before.
I haven't pulled the heads yet to assess the damage. I know I have several bent valves. I'm hoping I can slap on my LS6s heads and get some driving time in. I really don't want to do a new motor right now.
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
There are harmonics in the timing chain that will tend to wrap the chain around the bottom sprocket, i.e., the chain doesn't release correctly. The damper prevents this from happening. I believe it is approximately 4,000 RPM. A HPDE is the perfect setting for this to occur. I would suggest that if you plan to do HPDE, the damper is a must.
Safety Car
Joined: Oct 2000
Posts: 4,949
Likes: 10
From: Monticello MN
This is a little frightening. I had an LS2 chain installed in mine when I had the H/C, etc., setup installed. I did not install the dampener because chain tension was good following installation. I was told the dampener was necessary if there was a little loosness in the chain, which mine did not have. I do not race the car but play with it sometimes, as everyone does. I sure hope this never happens to me!
Ed
Ed
Drifting
Joined: Dec 1999
Posts: 1,541
Likes: 2
From: Raleigh NC
You will probably be fine. My chain had some play but my research indicated it was pretty normal. It was loose out of the plastic. My buddy just installed one on his new motor and said it was pretty loose as well. He did install the dampner. I didn't know about the dampner when I did my H/C.
If my pistons are salvagable, I am going to install my stock LS6 heads with some new springs and a new LS2 timing set with dampner and hope that I can get a few more HPDEs out of the motor. I really don't have the extra cash right now to buy a new motor.
If my pistons are salvagable, I am going to install my stock LS6 heads with some new springs and a new LS2 timing set with dampner and hope that I can get a few more HPDEs out of the motor. I really don't have the extra cash right now to buy a new motor.
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
Not sure what year your motor is, but the older tan GMPP damper is no longer made from what I have been told. If you have a newer block, the LS2 damper "may" fit, depends on bolt spacing. Also, if you are handy you could make one out of a solid block of material, not sure if Delrin would work but there should be an oil resistance block you could make it from if necessary.
Melting Slicks
Joined: Jul 2000
Posts: 2,541
Likes: 0
From: Chicago
What about the new dampner makes it not fit? I see an ls1/ls6 dampner advertised on thunderracings site, is it the older or newer one? Says some blocks may need to be drilled and tapped? Is this worth it in your opinion (vettenuts)? Can it even be done safely with the engine in the car? All this timing chain crap has got my head spinning...I was about to just order the comp single adjustable and forget about it, but now I hear that it doesn't come with a thrust bearing....they show one in the ad so what gives? Hell at this point I might just get an LS2 set and throw the cam in straight up...
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
Unfortunately, the bolt spacing is different between the LS2 damper and the GMPP LS1/6 damper. If you find one, and your block isn't drilled, it comes with a drill template.
If you plan on HPDE's, I think it is worth it in my opinion.
If you plan on HPDE's, I think it is worth it in my opinion.
Safety Car
Joined: Jul 2004
Posts: 3,904
Likes: 29
From: Vancouver Washington
If I open up my 01 LS6 am I probably going to find the holes already drilled or not? If not, are there specs for drilling the holes? Drilling the front of my block has a certain pucker factor to it, but the car is used for the track and the dampener sounds like a good safety factor.
