I lost my LS2 motor about 4 months ago, not sure if a lifter went and caused the timing chain to break or if the chain broke and messed up the lifter. What a mess. Bottom line, now running a forged 402 stroker. There is an up side to the disaster

 

My point being the cheapest part failed and it shouldn't be overlooked. We all know why the Challenger exploded, let's keep this thread on topic please.

 

Craig, on your old timing Chain I thinlk spin said it was stretched and
was going to compare ith with a new one and from the amount of stretch he may very well determine how many of degrees the cam is retarded or has been retarded in your last setup. Im sure the Chain issue will be around for a while.

 

i hope to stay this time

 

this winter we are planning on taking mine out and doing some measurements and then posting for everyone to see.

I should have about 20 RR days on the engine, a few 1/4 mile passes and some street miles. I still think the RR days are the worse so we should have some good data to share.

 

Please start the thread no permission required.

 

Yes, I have my old chain, just waiting on another to take a picture and post, definitely stretched at only 10K miles.

 

So who is the distributor for these IWIS chains, and I don't mean resellers such as LPE. One thing of interest...... has anyone looked into what caused the chain failure? There are a few things that can cause such as failure. One is if the chain is whipping around which is caused by a extra slack (common in LS1 engines) in the chain, the lack of the chain buffer such as what is used in a LS2 engine can be the cause other than just a loose chain. This can cause a failure, especially if there is an occasional cavitation in the oil pump which in some cause as the chain comes around when its loose under high RPM it can form a S shape, and it can actually catch and bind on the teeth of the sprocket which will cause the chain to snap. Also in some cases, if aftermarket retainers and springs are used and if there is some mechanical interference this can cause extreme loads on the chain which can also cause breakage.

In the LS7 engine, GM added the same LS2 style chain buffer and also a set of additional chain guides. GM also uses the exact same LS2 chain in the new LS9 engine, their test to validate this engine included WOT for 400 hours, this information came from Cloyes who is the OEM supplier for GM. Cloyes also supplys their aftermarket timing sets for the LS engines. Their timing sets are made with a slightly oversized gear for a more exact and much tighter fit, eliminating chain slack. Another interesting point that the Cloyes engineer brought up was that they have done extensive testing on the IWIS chain and have found no real advantages in strength or its design. For those interested you can contact Cloyes themselves at their Arkansas Aftermarket manufacturing plant.

A IWIS chain although stronger still may not be the final answer if the chain fit on the sprockets is loose. Which can still cause the failure.

 

Scoggins should have these parts, I spoke to craigster05 regarding his swap, he said they are the ones.

 

Cam Hang in there Buddy,
Your welcome2try my car out anytime come to jersey
You can race all you want till your beast is ready.
We will go to the track Atco.
Your in excellent hands with Chuck, I promise you!
Mike

 

The IWIS chain I used was tighter (much more so) than a brand new LS2 chain on the same stock gears. They are made smaller and prestretched before you use it.

While I didnt do the cam install in Cameron's car, I know for certain the buffer was installed on 3 cars with failures that I am aware of in road course failures. While I agree the chain failures can be attributed to non chain issues such as oil pump or material defect, there is no rocket science associated with a chain's install. There is no adjustment with stock gears and a stock chain so its either in right or wrong...not really an in between.. When you put a cam in and use the buffer, there isnt anything that could get messed up outside of not using a TQ wrench to install.

 

here is a video of cameron with his car still running http://www.youtube.com/watch?v=K8N4LuWLmIU

 

video was taking on a closed road

 

Hey thanks Braciole man, I might just do that . You don't mind if I power shift in 4th? .

I am not worried about Chuck we have worked in the past, he is a true stand up guy.

But you can bet I will be using the IWIS TC this time around with some new Dual Patriot Springs.

 

You wanna ride up there with me tomorrow?

 

Let's get spin to come up too! We'll lure him up here with some bait....

Let's throw some chicken legs, steaks, assorted Chinese food, and sushi niblets around my parking lot.... Then we'll sprinkle it with a special mix of protein power and soy sauce!

As soon as Spin gets a whif....He'll beat a path to my door and be sure to have lunch with us!!!


We'll fill your belly!
Chuck CoW

 

Chuck, I had second thaughts about comming but now that all that food is going to be around I am making the trip.Braciole I hope I can keep my temper LOL

 

I will be there around 1:30 2:00pm .

 

I definitely like the idea that it's pre-stretched and provides a tighter fit than a stocker. Was Camerons car a LS2 engine that had the LS2 buffer in between the crank and cam sprockets? Just curious if that could have been an issue, and you are absolutely correct that there isn't anything a competent wrench could screw up when installing a timing set.

 

You guys are too much, where is your seriousity?
Don't leave any french fries in the intake.

Looks like it's no longer Chuck CoW... Chuck Wagon sounds more like it.