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Karlio
Joined: 17 Nov 2019
Posts: 65
Location: UK
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 Posted: Wed Feb 28, 2024 2:42 am Post subject: Torque tube |
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Apart from Black Sea R&D who does replacement torque tube bearings for 924 n/a?
And if you were to build a new torque tube out of aluminium tube what thickness wall would be recommended?
Cheers karl |
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morghen
Joined: 21 Jan 2005
Posts: 8883
Location: Romania
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| Posted: Wed Feb 28, 2024 3:22 am Post subject: |
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Bearings are standard size as far as i know and i’ve heard of people using off the shelf bearings in their rebuilds.
The parts that are tricky to find are the plastic bushings that go in the centers of the bearings and rest on the torque shaft.
These you could find made by a Slovenian guy some years ago but i havent seen him around lately.
I have the drawings for these so i may try to make some.
The truly tricky bits are the outer ruber bushings that go on the outside of the bearings and rest on the inside surface of the torque tube.
If i’m not mistaken these are called vibration dampers and people re-use them or if they are dead they take them from other TTs and make a good set.
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Karlio
Joined: 17 Nov 2019
Posts: 65
Location: UK
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| Posted: Wed Feb 28, 2024 5:04 am Post subject: |
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| Have a shuftie at www.blackseard.com for the uprated bearings, they come complete. |
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Karlio
Joined: 17 Nov 2019
Posts: 65
Location: UK
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morghen
Joined: 21 Jan 2005
Posts: 8883
Location: Romania
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safe
Joined: 18 Mar 2017
Posts: 588
Location: Sweden
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| Posted: Wed Feb 28, 2024 10:58 pm Post subject: |
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I bought bearings and carriers from a Danish guy on Facebook. He sold the bearings or complete replacement torque tubes. I think it was info@9werk.dk, he doesn't seem to have any products on his website anymore.
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/Magnus, Stockholm Sweden
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Porsche 924 -79 NA, EFI and Turbo.
Porsche 931 -79
Porsche 911 -77, 3.2 Targa
Porsche 911 -69, 3.6, Coupe |
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Karlio
Joined: 17 Nov 2019
Posts: 65
Location: UK
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| Posted: Fri Mar 01, 2024 8:17 am Post subject: |
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| Any thoughts on wall thickness for aluminium tube swap? |
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ChrisMadge
Joined: 16 Dec 2020
Posts: 29
Location: Bristol, UK
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| Posted: Fri Mar 01, 2024 6:19 pm Post subject: |
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| morghen wrote: | Bearings are standard size as far as i know and i’ve heard of people using off the shelf bearings in their rebuilds.
The parts that are tricky to find are the plastic bushings that go in the centers of the bearings and rest on the torque shaft.
These you could find made by a Slovenian guy some years ago but i havent seen him around lately.
I have the drawings for these so i may try to make some.
The truly tricky bits are the outer ruber bushings that go on the outside of the bearings and rest on the inside surface of the torque tube.
If i’m not mistaken these are called vibration dampers and people re-use them or if they are dead they take them from other TTs and make a good set. |
In the UK https://www.augmentautomotive.co.uk/ repair torque tubes. They also remanufactured the plastic bushing in aluminium for my torque tube.
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1984 MY 924 2.0 NA
1975 MG Midget |
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safe
Joined: 18 Mar 2017
Posts: 588
Location: Sweden
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| Posted: Fri Mar 01, 2024 7:03 pm Post subject: |
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| Karlio wrote: | | Any thoughts on wall thickness for aluminium tube swap? |
A tube of that size is pretty stiff. I would make an educated guess that an aluminum tube of the same thickness as the steel one would do fine.
There is probably some online-calculator where you can figure out torsional stiffness in a pipe in different materials and find a thickness where you have a sweet spot and correlate that to an of the shelf size.
Porsche had problems with the original steel ones in the 968 when it wasn't a fully welded tube, but split design. That would be a significantly weaker design. I think that has been the only issues of the stock one. Apart from the 924NA having a small and weak shaft.
Porsche also made an aluminum one for racing, no idea how think that was. They have been made after that, a guy here in Sweden had 2 made for a time attack car, but both are sold.
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/Magnus, Stockholm Sweden
=======================
Porsche 924 -79 NA, EFI and Turbo.
Porsche 931 -79
Porsche 911 -77, 3.2 Targa
Porsche 911 -69, 3.6, Coupe
Last edited by safe on Fri Mar 01, 2024 7:05 pm; edited 1 time in total |
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morghen
Joined: 21 Jan 2005
Posts: 8883
Location: Romania
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| Posted: Fri Mar 01, 2024 7:03 pm Post subject: |
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| Karlio wrote: | | Any thoughts on wall thickness for aluminium tube swap? |
At least 6mm i'd say, 8-10 sounds good to me...especially if you intend to run rigid engine/gearbox mounts.
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daniel
Joined: 18 Jun 2009
Posts: 670
Location: Sydney, Australia
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| Posted: Sat Mar 02, 2024 10:12 am Post subject: |
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Carrera's had a alloy tube if I remember correctly. See if you can find any specs.
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Over the top of skyline, total brake failure.... hit the wall at over 200 kp/h at the dipper, so anyone who has to brake for the esses is a pussy.
1977.5 Race Car, CAMS Group S Spec
1989 944 Cabriolet |
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peterld
Joined: 10 Dec 2006
Posts: 946
Location: Noosa Heads QLD Australia
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| Posted: Sun Mar 03, 2024 11:21 pm Post subject: |
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IIRC, Mike9331 here on the Board made an alloy torque tube.
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80/81 932/8 ROW |
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jacobroufa
Joined: 18 Nov 2016
Posts: 531
Location: Belvidere, IL
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| Posted: Thu Apr 25, 2024 6:04 am Post subject: |
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Mike did make one and last I knew it was fitted to one of his 931s.. It was quite a process; maybe he can chime in with the latest updates!
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1980 Porsche 931
1981 Porsche 924 Weissach |
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