Suspicious timing chains delivered
 

Hoping that some of you builders can weigh in on the timing chains I received that have seams in the rollers- very concerned about this, as my factory chains did not have any seams in the rollers.

Forum discussion:
http://forums.pelicanparts.com/porsche-911-technical-forum/1176612-suspicious-looking-iwiss-timing-chain-delivered-today.html

You have 2 threads going on 2 subforums, please ask a moderator to merge them into one on this sub forum.

Yes, it was suggested that I post a pointer thread in this forum, since my original tech forum thread probably should have been started in this forum, and not in the tech forum. I have sent a request to have the threads merged.

Excellent!

And I did reply to your other post as well regarding what we found.

Well, I returned my regular timing chains with seams in the rollers, and re-ordered a set of Heavy Duty (Race) IWIS chains.

I just received them, and these chains also have seams in the rollers.. not sure what to do at this point- apparently, this is how they are being made now.

On the other thread you measured the lengths of you used chain and new chain. They were within .5mm total length. I would reuse the old ones.

Over the years, we have been asked to rebuild engines that were relatively low mileage and chains being over $150 a pair, we invented a tool to measure the chains accurately.
That said, we still use new chains on every build.
Caveat: race engines with only a few hrs don't need new chains.

Hi Pete,

I re-measured my chains against these latest new ones, and apparently my method of measuring was quite poor the first time around- I had my wife help this time.

I put both chains over a straight rod, and let them hang, then pulled down on firmly both of them to measured the difference at the bottom of the chains.

I got 3.5mm this time!

3.5mm x 2 = ~7mm total chain length difference.

It is also interesting to note that when I place them on their sides on the bench and arch them along their sides, that they have an identical arch- no wear shows up using this technique. I used to check my motorcycle chains this way, and would always have a smaller radius on a worn chain- not so with these chains. Perhaps because they are a double chain? IDK