Cam chains
12-22-2005, 12:15 PM
#2
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I was told by one of the tech's at the garage where the 928 frenzy was held this year, that there is a commercial chain on the market that is stronger then oem. He was not name specific, however he thinks D.R. @ 928 Specialists can supply them.
12-22-2005, 01:19 PM
#4
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I did ask 
So what is the real difference between IWIS and stock?
Going to need a couple of chain tensioner pads to go with the new chains.
Now all I have to do is decide on which cams these chains will drive!
So what is the real difference between IWIS and stock?
Going to need a couple of chain tensioner pads to go with the new chains.
Now all I have to do is decide on which cams these chains will drive!
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12-22-2005, 02:17 PM
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OK, I'll bite. What's wrong with the OEM chains?
Looks like the Porsche one and aftermarket one is the same price.
12-22-2005, 02:33 PM
#10
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We have the factory replacement ones from Iwis and the racing chains also in stock. The racing ones have all the stress risers machined off and are considerably smoother in appearance. The one on the left is the factory replacement and the one on the right is the racing chain. You will see large parting lines on the factory one that are machined off of the racing one. Much less prone to coming apart and well worth the additional money. We use them on all our rebuilds.
12-22-2005, 02:43 PM
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Originally Posted by Ketchmi
We have the factory replacement ones from Iwis and the racing chains also in stock. The racing ones have all the stress risers machined off and are considerably smoother in appearance. The one on the left is the factory replacement and the one on the right is the racing chain. You will see large parting lines on the factory one that are machined off of the racing one. Much less prone to coming apart and well worth the additional money. We use them on all our rebuilds.
Glenn
12-22-2005, 02:57 PM
#13
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What could cause the chains to come apart? Even though I replaced mine, they didn't appearing damaged at all following the t-belt failure.
12-22-2005, 03:01 PM
#14
Drifting
ALWAYS replace them after a timing belt failure. They have experienced stresses much greater than they were intended for by forcing the valves into the tops of the pistons.
We have seen some come apart on their own but it's usually a chunk of something floating around the engine that gets caught in the cam teeth and snaps the chain. Pretty common on 944S's...or a tensioner mount failure which throws a big chunk of something into the cam teeth.
We have seen some come apart on their own but it's usually a chunk of something floating around the engine that gets caught in the cam teeth and snaps the chain. Pretty common on 944S's...or a tensioner mount failure which throws a big chunk of something into the cam teeth.