Kevin

Jake, point us to the higher IWIS chain grades.. The highest grade that I know that is available without a enhanced treatment is the Motorsports chains.. One can order the latest Porsche factory offering with a 997GT3 or 997GT2RS..

Nizzki, please note that you will need to replace all your cam sprockets and vario cam modules with new. This will require you to split the engine case. Leaving a worn sprocket and fitting with the BEST timing chain will quickly wear to the common denominator.

nizzki

They checked the sprockets (that you can see on the table), apparently they looked great. I think they said the variocam thingie had some crap in it, so they're replacing that.
Not sure about the other ones, i assume that without a master link, they have to take more of the engine apart to be able to put a new chain in anyway.

Kevin

I would recommend replacing "all" the sprockets on the failed bank at a minimum.

Bates

Nizzki -
I can't add much to this thread - just sitting here with a sour belly and my fingers crossed. But I can tell you when you put a new chain on a bicycle it will make a racket. The chain rings (sprockets) are worn just enough for you to hear them interfering. Now scale this up from a 39-year-old-bozo-on-a-bike to 450hp German toy (with 83,000 miles).

Please replace your sprockets and keep us informed as you rebuild.

nizzki

Yea, since they're already in there i guess they might as well swap the sprockets out. They're already sitting around on a shelf.

nizzki

A couple more pictures from the shop. Lots of pretty shavings from the plastic guides.

Kevin

In your first picture, the chain has worn the aluminum case web. You will have aluminum shavings also. You need to have the shop look for cracking between the aluminum web. When the chain breaks it can pouch the case outward. This happens when the chain is wound up around the IMS. It is very hard to see.

Os Inspector

A flouresecent PT or Liquid Penetrant Test should reveal any cracking.

nizzki

I'll ask them about that tomorrow, i was going to swing by anyway to see the engine completely disassembled.
Luckily i wasn't going very fast so there wasn't as much kinetic energy in the chain, but still.

nizzki

Got an estimate, it's quite a bit higher than they originally said.
So far they've only e-mailed it to me, i didn't have time to go see them today, i'll talk to them tomorrow.
A big chunk of the increase in cost is because they're replacing a bunch of parts that might as well be done with the engine open, such as the bearings, rings, etc. There are also a couple expensive things that needed replacing, i.e. the cam actuator, lifters and chain tensioners.
They also messed up on the rod bearings, i think they got 6 sets of bearings rather than 6 bearings, so that will drop the price a bit. Oh, and this also doesn't include the machine shop work, so yea, not cheap.

Let me know what you guys think.

Flat6 Innovations

Looks pretty complete to me.. They will need 6 sets of rod bearings, they are sold per journal.

nizzki

Right, but when i looked around a full set of 12 halves was about 150 bucks, not the 1200 they had listed.
Either way, i also found the activator new in box on ebay for 699, might not be a bad idea. Those lifters are fairly expensive as well.

leftlane

Best of luck - looks like their hourly labor rate isn't too bad. I'm completely intimidated by all of this.

The NSX dude

Best of luck, I feel for you.

Quick Question for Jake and Kevin, do you feel as though this is something that can be avoided for other Metzger engine owners or is this a 1 and a million type of scenario?

I dont remember hearing many timing chains breaking and causing this type of damage.

Kevin

You shop has quoted you OEM aftermarket rings.. They will find out that you can't use them because our engine have a pinned 2nd ring. That means that you will be forced to go to the dealer.. Cost will go up (you can call Sonnen Porsche 866 Sonnen1)..

Also, I didn't see a oil pump. When they pull apart your oil pump they might see too much plastic or metal being run thru the scavenge side (please note, I have 4 or 5 near new pumps>have the shop call me)..

2) I would recommend that you replace the other bank vario cam actuator..

3) It's a great time to pin or weld all of your coolant fittings (all eight). It would ruin your day if one failed and you had to pull the engine out to get one replaced..