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-   -   Porsche or VW flanges, 901 trans HELP! (https://www.germanlook.net/forums/showthread.php?t=9173)

MartinH December 25th 2007 15:37

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:

http://www.meanbugs.com/tabort/flag.jpg
4,3inch diam. hits the frame

skywalker December 25th 2007 16:24

Hi Martin,

Yes you can replace them by 90mm flanges.

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

http://home.planet.nl/~schur505/A2M/215.jpg


Luuk

MartinH December 25th 2007 16:36

90mm is that VW typ1 IRS diam? They are bolt on the 901 trannys? Thanks!

skywalker December 25th 2007 16:44

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.

http://home.planet.nl/~schur505/A2M/193.jpg

trevorbrady December 25th 2007 17:22

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:

http://www.veewrx.com/VWRX-engine-ge...tputshafts.jpg

MartinH December 25th 2007 17:26

Quote:

Originally Posted by trevorbrady (Post 63139)
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!!

MartinH December 25th 2007 20:46

I think type 1 IRS flanges will fit the 901. Can anybody confirm?

skywalker December 26th 2007 08:48

Quote:

Originally Posted by MartinH (Post 63142)
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. ;)

trevorbrady December 26th 2007 09:51

http://www.veewrx.com/VWRX-engine-ge...5-outputs2.jpg

901 (type1 sized CV) flange on left, 915 (930 sized CV) on right

as skywalker says, 90mm outside diameter

MartinH December 26th 2007 10:20

Thanks guys!!! :) So then I just have to find flanges from an IRS type1 Bug then, Same splines as the 901? Thanks alot!!

MartinH December 27th 2007 16:35

Quote:

Originally Posted by trevorbrady (Post 63139)
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:

http://www.veewrx.com/VWRX-engine-ge...tputshafts.jpg

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

trevorbrady December 27th 2007 19:21

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:

http://www.veewrx.com/VWRX-engine-ge...4gearbox11.jpg
(note driveshafts are angled because the transmission was moved forward a bit)

MartinH December 28th 2007 11:47

Quote:

Originally Posted by trevorbrady (Post 63161)
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 ;)

jmd May 4th 2009 11:13

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?

trevorbrady May 4th 2009 13:53

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

http://www.veewrx.com/VWRX-engine-ge...edflange04.jpg

http://www.veewrx.com/VWRX-engine-ge...edflange01.jpg

http://www.veewrx.com/VWRX-engine-gearbox/4-7-05-09.jpg

the full low-down is here:

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


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