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  #1  
Old December 25th 2007, 15:37
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MartinH MartinH is offline
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Porsche or VW flanges, 901 trans HELP!

Hello everyone!

I have a question about the flanges on my Porsche 901 1969 transmission, they measure 4,3 inch, the problem is that they are hitting the framehorns. Could I replace these flanges with a VW beetle's? Are the diam. smaller on VW's? Or should I just notch down the framhorn a 1cm or so?

PLEASE HELP fast!!

Here is a picture:


4,3inch diam. hits the frame
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  #2  
Old December 25th 2007, 16:24
skywalker
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Hi Martin,

Yes you can replace them by 90mm flanges.

My 914 gearbox in my split bus with 90mm flanges (almost the same setup):




Luuk
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  #3  
Old December 25th 2007, 16:36
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90mm is that VW typ1 IRS diam? They are bolt on the 901 trannys? Thanks!
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  #4  
Old December 25th 2007, 16:44
skywalker
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90mm can be VW type 1 or Porsche 914/915.
Porsche however has only 4 bolts, bug has 6.
I used 914 flanges, but I did modify them to 6 bolts.

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  #5  
Old December 25th 2007, 17:22
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I have a pair of type1 CV sized output flanges to fit a 901 (coarse splines) I will sell if you need them

They are drilled for 6 holes:


Last edited by trevorbrady; December 25th 2007 at 17:23. Reason: added pic
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  #6  
Old December 25th 2007, 17:26
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Quote:
Originally Posted by trevorbrady View Post
I have a pair of type1 CV sized output flanges to fit a 901 (coarse splines) I will sell if you need them

They are drilled for 6 holes.
Sounds good! How big diam. are they? Because thats the problem here, I need more space to my framehorns. Or what could I use to the flanges I have? I want to keep it as simple as possible. Thanks for all answers, great forum!!
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  #7  
Old December 25th 2007, 20:46
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I think type 1 IRS flanges will fit the 901. Can anybody confirm?
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  #8  
Old December 26th 2007, 08:48
skywalker
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Quote:
Originally Posted by MartinH View Post
I think type 1 IRS flanges will fit the 901. Can anybody confirm?
Yes, they fit.
Those from trevorbrady are 90mm. VW type 1 never had 110mm.
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  #9  
Old December 26th 2007, 09:51
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901 (type1 sized CV) flange on left, 915 (930 sized CV) on right

as skywalker says, 90mm outside diameter
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Old December 26th 2007, 10:20
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Thanks guys!!! So then I just have to find flanges from an IRS type1 Bug then, Same splines as the 901? Thanks alot!!
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  #11  
Old December 27th 2007, 16:35
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Quote:
Originally Posted by trevorbrady View Post
I have a pair of type1 CV sized output flanges to fit a 901 (coarse splines) I will sell if you need them

They are drilled for 6 holes:

Anyone here who are OR have used these types of flanges in 901 tranny in a type1 chassi? Im afraid that the driveshafts will be too long. What do you think? Hmm

Last edited by MartinH; December 27th 2007 at 16:36.
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  #12  
Old December 27th 2007, 19:21
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Martin, I tested those 901 flanges in my 915 transmission in my VW chassis using stock VW type1 IRS trailing arms, stock VW type1 drive shafts and stock VW type1 CVs. Everything mated up nicely.

I have since upgraded to the 930 sized flanges which I had redrilled to suit the stock 944/VW type2 CVs, stock 944 turbo driveshafts with early 944 turbo aluminium trailing arms.

I tried to keep everything to standard off-the-shelf parts where possible but I couldn't find a pair of output flanges to fit the 915 transmission that used the 944/type2 CV bolt pattern so I had to have them modified instead.#

just found this pic of the above setup:


(note driveshafts are angled because the transmission was moved forward a bit)

Last edited by trevorbrady; December 28th 2007 at 16:53. Reason: added pic
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  #13  
Old December 28th 2007, 11:47
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Quote:
Originally Posted by trevorbrady View Post
Martin, I tested those 901 flanges in my 915 transmission in my VW chassis using stock VW type1 IRS trailing arms, stock VW type1 drive shafts and stock VW type1 CVs. Everything mated up nicely.

I have since upgraded to the 930 sized flanges which I had redrilled to suit the stock 944/VW type2 CVs, stock 944 turbo driveshafts with early 944 turbo aluminium trailing arms.

I tried to keep everything to standard off-the-shelf parts where possible but I couldn't find a pair of output flanges to fit the 915 transmission that used the 944/type2 CV bolt pattern so I had to have them modified instead.
Great info, thanks again Trev! Check your PM inbox
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  #14  
Old May 4th 2009, 11:13
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Ok, so I am working with a 69' 901 with 108MM output flanges and 87 944 alu trailing arms. I am wondering if anyone else is using this setup and if so what is the final solution (hopefully someone up and running can chime in) for the cv's and axle's? I am looking for fact not speculation... thank you for any insights.

Trevor,
are you able to post some images of your modified flanges?
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  #15  
Old May 4th 2009, 13:53
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I now have 930 size output shafts (redrilled to 944/VW Type4/VW bus size CV bolt pattern), 944 CV joints, early turbo aluminium trailing arms, 944 turbo drive shafts and it all works nicely.

these are the 930 output shafts: the 930 CVs use 4 bolts and two dowels, the arrows point tot he 944 CV PCD holes drilled and tapped







the full low-down is here:

http://www.veewrx.com/VWRX-engine-ge...ne-gearbox.htm
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