ScottS2

Hello to all. I have a simple yet important question: Are all 944S2 Torque tubes the same? In other words, will a 1990 S2 torque tube fit in a 1989 S2?

Thanks in advance for your help

Scott

Wipeout

All torque tubes for the 944 are the same, period.

ScottS2

Thanks for your reply.

I was told by my local Porsche boneyard that some 944s (I assume later model years) had a "split" torque tube. I notice that mine has a lengthwise slit at the forward (engine) end that is roughly 1.5 ft long.

Thanks again.

Wipeout

The split is there on S2s, but not NAs (not sure about the turbo). Supposedly it's there for crashes; torque tube becomes a crumple zone. There was a good thread about it about a month ago.

I have the TT out of my '85 that I will probably rebuild and put into my '89 S2.

PorscheDoc

I have only seen the split torque tubes on the S2 and 968 Cabs, but others may have it. The half dozen S2 coupes I have done clutches on, did not have the split TT. We did swap a 951 TT into an S2 cab which had a bad TT a few months ago.

Chads996

WRONG. The split is on S2 TT's. I was told it had something to do with the harmonics/vibration. Also, the S2 has an inspection port on the aft bell. Others do not.

Something also to consider - the S2 is a hodge-podge of Porsche parts. Upon speaking to a few tech's about the S2's, they mention finding forged rods in the engines. There is also further proof of the variations of the parts through the life of the S2's. Example: the clutches mechanism (master, slaves and lines..) differ on the '89's versus the '90 & '91. In 1990 & 1991, they started bringing the 968 electrical harnesses and mechanicals into the car. The 1989 electrical harnesses are more similar to the 1989 turbo than the later S2.

From my build, I have learned a ton about what a "mule" the S2's really were for Porsche's 968 development.

C.

ScottS2

All good info. Thanks, gentlemen!

While we're here, here are a couple of more questions:
1) Is there a source for those bearing carriers that go down the inside of the TT?
2) Is there a source for the rubber/metal inner "race" that gets pressed into the TT bearings (the ones teh drive shaft slips down inside of)?
3) I'm assuming from what has been said so far that the drive shaft is the same for all 944s?

Thanks again in advance.

Scott

Wipeout

Strange, I seem to remember from the other thread that S2 TT and other 944/951 TT are the same length, bolt patterns, etc. The difference is the slit, that's all.

...here's "the other thread"
https://rennlist.com/forums/924-931-...aring-pic.html

Chads996

Technically speaking, yes. The same bolt pattern, they will fit. However, you said that all 944 TT's are the same. They are not.

C.

Wipeout

Touché.

How's the ubercar?

smlporsche

I wonder where you got that info

That is SOP for Porsche as they have done it for decades. For example some '04 Boxsters (986) have some 987 parts and there are several examples in the 911 line as well.
Those Germans are very frugal...

Eric_Oz_S2

1) The bearing carriers can be had from Jager for $150 ea (cough cough) - you probably won't need new ones though. If you did you would be better off getting a used tt
2) Again, Jager sells these for around $20 each. I am getting mine fabricated locally out of Acetal for a similar price'
3) Driveshaft is the same, except the S2s are coated with a kind of epoxy - the measured diameter is still exactly 25.00mm though (must be a really thin coating). The coating makes it more difficult to push out the shaft with a hammer, you are better off pressing it out with a jack and a 1.2m long length of 15mm/.5inch galv pipe.

ScottS2

Thanks again for all the info. I even read the previous TT thread that Darren referenced and learned even more there as well. Dealing with the TT in a 944 can make you pull your hair out if you aren't informed. It's like a friend always told me, it's German, so there's a trick to it. If you miss the trick, you could be in a lot of trouble. If you know the trick, things usually go fairly smoothly. If it wasn't for the Rennlist, I'd be hosed. Thanks again.

Cheers,

ScottS2

Thanks again for all the info. I even read the previous TT thread that Darren referenced and learned even more there as well. Dealing with the TT in a 944 can make you pull your hair out if you aren't informed. It's like a friend always told me, it's German, so there's a trick to it. If you miss the trick, you could be in a lot of trouble. If you know the trick, things usually go fairly smoothly. If it wasn't for the Rennlist, I'd be hosed. Thanks again.

Cheers,

Tim968

The story of the slot is related to reducing torsional resonance in the driveline. It was patented by Porsche. See http://www.patentstorm.us/patents/5067582.html.