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968 Connecting Rod Failure ??

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Old Nov 20, 2004 | 10:10 AM
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Default 968 Connecting Rod Failure ??

Do any 968'ers out there have any info / knowledge of connecting rods failing / snapping in 968 engines...especially when pushed for DE track /race use?

cooz
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Old Nov 20, 2004 | 11:34 AM
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I have only heard of one instance and seen pics of it. Not pretty!
The rod went through the wall and made a big mess. They are forged so they should be able to sustain some serious abuse. Just for reference, they used the same 968 rods when they built the turbo S/RS so they should be plenty strong to handle the revs.
Now if the engine was out and you were rebuilding it, I would say upgrade to Carillo rods. Cheap insurance.
Raj
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Old Nov 20, 2004 | 02:37 PM
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Hi 968turboS from NJ....

thanks for your comment.
I know 944 turbo S and turbo cup....however I didn't realize there is an RS?

what is a 944 turbo RS?

are the rods in the USA turbo S the same as stock OEM 968 rods?

cooz 95 993 C2 from NJ too
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Old Nov 20, 2004 | 03:55 PM
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Cooz, he means the 968 Turbo S and RS.
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Old Nov 20, 2004 | 05:51 PM
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The rods on the 968 are weak. Especially the first one on some early cars break very easy. Porsche changed them in the later cars and say to do the same if someone opends the engine in the early cars.
the 968 Turbo S and RS do NOT use the same rods. This is a mistake found is some old Porsche books. It is a lot changed in these cars and this is not documented in books. You can know these infos only from people at R&D who worked on these cars.

Yes the rods are forged but not as strong as the 951 cup or the 951 86 one.
The later Turbo RS used Carrillo rods and all the replica done by some German racers and tuners used Carillo too.

Konstantin
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Old Nov 20, 2004 | 07:54 PM
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Originally Posted by Konstantin
The later Turbo RS used Carrillo rods and all the replica done by some German racers and tuners used Carillo too.
Konstantin
Thanks, nice to know this as this is the route Chris Cervelli went as well.
Raj
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Old Nov 21, 2004 | 03:18 AM
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Konstantin....
how about the rods in a 1994 usa stock 968 engine? should I be concerned about possible/likely failure or did Porsche somehow improve them by 1994?

cooz
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Old Nov 21, 2004 | 08:00 AM
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the 94 rods are for a NA engine ok. no problem with them. if they break it will be something else like no oil in the bearing.
You can not break them with the power of a 968 engine

Konstantin
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Old Nov 21, 2004 | 11:03 AM
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Konstantin....thanks for the info....

do you know when the improvement occurred on these 968 rods or rather which engines to stay away from?

will these later rods hold up even for a track/race car with stock hp?

cooz
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Old Nov 21, 2004 | 12:23 PM
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They are fortified on the bottom. It is covered in the repair manual. From memmory, they also use a different bolt on the rod bearing.
Raj
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Old Nov 21, 2004 | 04:08 PM
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Default Rod upgrade

If my attachement works you can see from which engine numbers the new rod was installed. Having seen the damage that can occur, I wouldn't drive one of the old ones at all before an upgrade.

Bengt
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Old Nov 21, 2004 | 09:30 PM
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while we at it, what about the pistons ?

my research has found that the '92 model used KS (Kolbenschmidt) which were not forged, and (for good reason) were changed to (forged) Mahle pistons in the later models

opinions ?
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Old Nov 22, 2004 | 07:45 AM
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do you think Mahle is better than Kolbenschmidt?
all 951 use KS Pistons and you know how much boost they run.

Konstantin
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Old Nov 22, 2004 | 09:15 PM
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on the subject of pistons, are the rings in the 968 gapless? if not, has anyone tried gapless rings? it's an old trick for a few extra ponies, that works on other engines
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Old Nov 23, 2004 | 09:35 AM
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I don't think they are gapless but the stock one work ok.
my 968 Turbo S has almso zero leak down on all cylinder

Konstantin
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