BC

Todd Did make his own - but with a larger shaft.

Black Sea RD

Thanks David for the nice words on the new TT stuff!

I want to be careful to not run afoul of the Rennlist rules since I'm not yet a sponsor and want to respect those who are and sell rebuilt TTs. That's why the statement to our moderator JV!

We have developed the next step in rebuilding TTs to a better spec than what Porsche initially did and which did not seem to change in the whole production run of the 928. Our bearing units are bigger, heavier and use larger bearings. They were designed to easily rebuild the TT at your location, will resist "walking" in the TT and will come in both the heavy steel versions and lighter weight aluminum for track duties.

The drive shafts were commissioned through a well known manufacturer and we are finalizing our arrangements and standing with them to be able to offer 928 drive shafts which are made of a stronger material than Porsche OE drive shafts. This will allow the 928 automatic owners who have the shear prone 28mm driveshafts to change to the 25mm constant diameter driveshaft, and it will be even stronger than the original OE driveshafts.

These new TT pieces were developed to give the 928 owner a better way to rebuild their TTs and not have to use old parts and pieces that are going away due to age and wear. We targeted known weak areas of the TT pieces and brought them into a more modern level without redesigning the whole TT system.

Sterling, my apologies for not wanting to discuss the materials with you but please understand this all is a huge undertaking for us in both effort and resources. These parts are the reason why we are now track car-less. All will be disclosed soon after all the correct arrangements have been made.

Not being able to leave well enough alone, we are tweaking the outside rubber of the bearing assemblies. These pieces will be available by this Fall through 928 Specialists.

Kind regards,
Constantine
P.S. 944 TT rebuild stuff coming too...

Stan.Shaw@Excell.Net

I tihnk you mean RV for the moderator or maybe JD

Perhaps selling through 928 Specialists qualifies your product as a sponsor in this case, so no foul.

Black Sea RD

You are right, meant RV.

Thanks Stan!

Constantine

Fabio421

So, are your bearing units able to be used with both stock drive shafts as well as the new shafts you are developing?

Black Sea RD

Hi Sean

Yes, the new bearing units will have inserts that will fit both the 25mm and 28mm OE drive shafts as well as our new, stronger 25mm drive shafts. We will recommend that owners of the 28mm drive shafts change theirs to the 25mm drive shafts to remove the possibility of shearing at the necked down portions of the OE 28mm drive shafts. But that's up to the owner.

And so no one is confused, the TT bearing units are for both the automatic and 5 speed 928s and for all model years.

Have a great day,
Constantine

Vilhuer

Very interesting products.

How about driveshafts, will you make all five different versions?

- Early '78 5sp
- Later '78 - early '80 5sp
- Later '80 - '95 5sp
- 3sp automatic
- 4sp automatic

If price isn't too high, I'm in for '80+ 5sp shaft and bearings.

Stan.Shaw@Excell.Net

Very intriguing, while the race car is apart (when is it ever together?) this would be a good time for me to do it as well...

John Veninger

Nice stuff.

Black Sea RD

Thank you Erkka! I know you put enough time into the study of the TT yourself!

Okay, about the shafts, we initially envisioned making replacement drive shafts only for the later style 28mm automatic drive shafts, the ones that have a problem with shearing at the necked down portions of the shaft. The constant diameter 25mm auto drive shafts are less prone to this behavior which are the ones we replicated with a stronger material than stock. The 25mm auto drive shafts can be used in all model year auto 928s since our new bearing carriers have different centers that will take either the 25mm or 28mm size. Owners' preference if they want to stay with their 28mm shaft or buy a new 25mm shaft.

However, since this posting we have been contacted by those with special needs, a drive shaft that would be able to handle 900+ ft lbs of torque and another who needs a shorter than normal drive shaft for his project, all of which we can accomodate. Which then started us thinking about offering drive shafts for all 928 purposes and probably new and stronger half shafts too.

So yes we will offer replacement shafts for all model 928s, except maybe the low volume early 5 speed versions. But we'll see if there is enough interest with those to have a run made.

One question for you, what would you consider acceptable pricing for a new drive shaft?

Formal announcement will be made when the parts are ready for sale.

Kind regards,
Constantine

Black Sea RD

Thanks John!

Black Sea RD

Can't think of a better time Stan!

Bill Ball

Constantine:

Will your AT shafts include the groove for installing the shim and circlip retainer?

atb

Bill,
Not necessary with the Constantine Clamp.

Black Sea RD

Yes they do. But we do not recommend that approach to stopping the drive shaft slippage at the front flexplate clamp.

Constantine