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Exact OD of 931 Down Pipe

 
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Rasta Monsta  



Joined: 12 Jul 2006
Posts: 11353
Location: PacNW

PostPosted: Fri Apr 14, 2017 1:47 am    Post subject: Exact OD of 931 Down Pipe Reply with quote

Por favor. Gracias.
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Mike9311  



Joined: 14 Dec 2004
Posts: 653
Location: Chicago-ish

PostPosted: Sun Apr 16, 2017 12:59 am    Post subject: Reply with quote

Rasta

If nobody answers this before me, I''ll get it measured. A 931 is on the lift plus I have a few downpipes lying around. One of the very reasons its on the lift is do redo the downpipe and exhaust.
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Carrera RSR  



Joined: 08 Jan 2010
Posts: 1545
Location: Somerset, UK

PostPosted: Sun Apr 16, 2017 2:06 am    Post subject: Reply with quote

Assume you mean the front pipe coming off the turbo? 60mm
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Mike9311  



Joined: 14 Dec 2004
Posts: 653
Location: Chicago-ish

PostPosted: Sun Apr 16, 2017 3:18 am    Post subject: Reply with quote

Carrera RSR wrote:
Assume you mean the front pipe coming off the turbo? 60mm


...and that is a kooky number for what we have access to over here. 2.36"

57mm is basically 2.25" so at our 2.5", easy to get tube, we are at 63.5mm and 3" is 76.2

Its harder to get 2.75"
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1980 931 ...off with the cobwebs
1982 931 Entwicklungsfahrzeug
1979 924 NA M471/M481 / ohne M650 Herausnehmbares Dach
0.5 1982 931 smashed parts car
1982 931 parts car?
1980 924 NA (R&D lightweight)
1982 931 WB wana-be GTR race car
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morghen  



Joined: 21 Jan 2005
Posts: 7825
Location: Romania

PostPosted: Sun Apr 16, 2017 4:08 am    Post subject: Reply with quote

Inches seems like a scale for agricultural applications
Non metric stuff is silly....you can count all of those 60mm if you want to..but how will you count the 2.36 inches?
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Rasta Monsta  



Joined: 12 Jul 2006
Posts: 11353
Location: PacNW

PostPosted: Sun Apr 16, 2017 4:45 am    Post subject: Reply with quote

I've been fighting the connection between the downpipe and the rest of the system ever since I got this car. There is a "slip fit" there now, with a clamp on it, but it's loose.

Suggestions welcomed. I've been browsing some racey clamp setups, etc, trying to find a good solution.
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Mike9311  



Joined: 14 Dec 2004
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Location: Chicago-ish

PostPosted: Sun Apr 16, 2017 6:33 am    Post subject: Reply with quote

Morghen- We are stuck with non metric even though I like working in both. Maybe its because I have to most of the time. If we get speed limits here in kph they will just lower the speed limit. For that reason I'll stay non for now

Rasta - why not try something like this? Just v-flange and call it a day Edit: Cheap ebay OBX or other works just fine but personally I like the ones that have a pilot lip. It centers everything and it seals up nice

I made this for an experimental exhaust for my BMW.

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1980 931 ...off with the cobwebs
1982 931 Entwicklungsfahrzeug
1979 924 NA M471/M481 / ohne M650 Herausnehmbares Dach
0.5 1982 931 smashed parts car
1982 931 parts car?
1980 924 NA (R&D lightweight)
1982 931 WB wana-be GTR race car
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WEASEL149  



Joined: 19 Aug 2005
Posts: 592
Location: UK, Sheffield

PostPosted: Sun Apr 16, 2017 6:48 am    Post subject: Reply with quote

morghen wrote:
Inches seems like a scale for agricultural applications
Non metric stuff is silly....you can count all of those 60mm if you want to..but how will you count the 2.36 inches?


I constantly have to convert from metric to imperial/inch and vice versa. Units are just units after all.
Counting 2.36" reasonably accurately, just use thousandths@2360.
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Kenodog  



Joined: 25 Jun 2003
Posts: 2419
Location: Vancouver,B.C.

PostPosted: Sun Apr 16, 2017 8:32 am    Post subject: Reply with quote

Ridiculously simple fix. Have a machine shop turn a step spacer from 60mm to 2.5" nominal. Tig weld the spacer to some 2.5" pipe and away you go. In the future all necessary bits will be common to N. America 2.5" stuff.




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Carrera RSR  



Joined: 08 Jan 2010
Posts: 1545
Location: Somerset, UK

PostPosted: Sun Apr 16, 2017 8:53 am    Post subject: Reply with quote

Rasta Monsta wrote:
I've been fighting the connection between the downpipe and the rest of the system ever since I got this car. There is a "slip fit" there now, with a clamp on it, but it's loose.

Suggestions welcomed. I've been browsing some racey clamp setups, etc, trying to find a good solution.


Never had an issue with my slip joint. Snug fit and coated with loctite high temp gasket sealant.

https://www.flickr.com/photos/16693103@N03/8321038043/in/album-72157629431377585/

PS this set up has been made redundant by a custom front section
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1980 931 - forged pistons, Piper cam, CGT turbo, 951 ducted FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife LSD
Now www.924board.org/viewtopic.php?t=34690
Then www.924board.org/viewtopic.php?t=31252
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