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stevekat
Joined: 19 Jan 2008
Posts: 719
Location: Los Angeles, CA
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 Posted: Mon Mar 03, 2008 7:10 am Post subject: 931 Exhaust Manifold Part Numbers |
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Looking at a couple of exhaust manifolds for a 931...PET I have from 11.11.2005 says part is 931 111 096 00 and this is the latest iteration.
The two I am looking at are:
931 111 594 OR
931 111 596 OR (This may have the reinforcements
Any clue regarding the two above part numbers. I found the 596 number on the price list, and it isn't superseded. I am not sure why, but it is less expensive that the 096 number.
The application would be for a 1981 931 U.S. |
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emoore924
Joined: 13 Apr 2004
Posts: 2822
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| Posted: Tue Mar 04, 2008 2:23 pm Post subject: |
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They changed the gasket types on these a couple of times. That might explain different part numbers. Check the tech section here at 924.org. I think the 931 manifold is detailed pretty well.
If you want pics, I have a couple sitting on my basement floor. I can check #'s and send you pics if you want. PM if interested. |
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stevekat
Joined: 19 Jan 2008
Posts: 719
Location: Los Angeles, CA
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| Posted: Tue Mar 04, 2008 4:40 pm Post subject: |
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I looked through the tech sections, and it seemed to indicate the 096 number was the latest iteration, but no mention of the two part numbers above. One of the photos I have seems to show some reinforcing ribs under the unit with the 596 number.
If you have a 596 and an 096, would be very interested to see what difference you found, either reinforcing ribs, recess for sealing ring, etc.
The 596 and 096 units are both on the dated price sheet I have, with the 596 unit being less expensive for who knows why. |
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Rasta Monsta
Joined: 12 Jul 2006
Posts: 11733
Location: PacNW
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| Posted: Tue Mar 04, 2008 4:58 pm Post subject: |
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I believe the manifold flange stays flat and the recess is in the turbo flange.
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Toofah King Bad
- WeiBe (1987 924S 2.5t) - 931 S3
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emoore924
Joined: 13 Apr 2004
Posts: 2822
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| Posted: Wed Mar 05, 2008 3:05 pm Post subject: |
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Today's your lucky day.
I went and looked at the manifolds. The part numbers end in 594 and 596 (I think, hard to see w/out glasses  ). Sorry, no 096. I have another one coming back from Jet-Hot that's a 596 I think...
There are differences in the castings.
One has the support ribs in the casting as you mentioned.
The turbo flange is different in that one has more of a multi-stepped recess, the other does not.
The mounting surface that mates to the head looks very similar for each of them but I'd have to mic it to be sure it is really the same.
Both have the little rings used to seal the manifold to the head.
There may be other differences but I'm old and I probably forgot them since I walked up the stairs and started typing. If you want pics, PM me and I'll send you what you need. |
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ideola
Joined: 01 Oct 2004
Posts: 15550
Location: Spring Lake MI
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| Posted: Fri Mar 07, 2008 1:27 pm Post subject: |
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Detailed pix of a 596 part (upgraded series II part, this one with NO cracks  )
 
 
 
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erstwhile owner of just about every 924 variant ever made |
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stevekat
Joined: 19 Jan 2008
Posts: 719
Location: Los Angeles, CA
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| Posted: Fri Mar 07, 2008 5:49 pm Post subject: |
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That is a nice looking manifold, if there is such a thing Any idea if this is the last iteration, because the current number in the PET seems to end in 096.
Being a Series II, is it your understanding this was supplied on a 1981 or 1982?
I am staring to think maybe the 596 part number came on later cars (with the reinforcements) and that the 096 is the equivalent part for super-ceding the earlier style manifolds if you order as a spare part via Porsche.
Not sure if they did this kind of parts number shuffling. |
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ideola
Joined: 01 Oct 2004
Posts: 15550
Location: Spring Lake MI
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| Posted: Sat Mar 08, 2008 1:12 am Post subject: |
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| stevekat wrote: | | That is a nice looking manifold, if there is such a thing Any idea if this is the last iteration, because the current number in the PET seems to end in 096. |
Here's where it gets interesting: the tag that is attached to it has the 096 number listed on it. However, the casting says 596!
| stevekat wrote: | | Being a Series II, is it your understanding this was supplied on a 1981 or 1982? |
That I don't know. I always understood that the 81 and 82 had the same part, but I could be wrong.
| stevekat wrote: | I am staring to think maybe the 596 part number came on later cars (with the reinforcements) and that the 096 is the equivalent part for super-ceding the earlier style manifolds if you order as a spare part via Porsche.
Not sure if they did this kind of parts number shuffling. |
Me either...but I like your theory 
Here are pix of a 594 unit. This one is cracked on the #2 runner, and came off of a 1980 Series I. You can clearly see that it does not have the reinforcements.
 
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erstwhile owner of just about every 924 variant ever made |
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emoore924
Joined: 13 Apr 2004
Posts: 2822
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| Posted: Sat Mar 08, 2008 3:08 pm Post subject: |
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| Ok, I have some nice pickies. Who can host them for me? PM your email addy and I'l send them along... |
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stevekat
Joined: 19 Jan 2008
Posts: 719
Location: Los Angeles, CA
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| Posted: Sat Mar 08, 2008 5:56 pm Post subject: |
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emoore924, look forward to seeing your pics.
ideola, with the tag saying 096, and the stamped part saying 596, could be another data point indicating they are, in effect, the same part. |
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ideola
Joined: 01 Oct 2004
Posts: 15550
Location: Spring Lake MI
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| Posted: Sun Mar 09, 2008 1:25 am Post subject: |
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| stevekat wrote: | | ideola, with the tag saying 096, and the stamped part saying 596, could be another data point indicating they are, in effect, the same part. |
Seems likely...
Emoore, you have PM.
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erstwhile owner of just about every 924 variant ever made |
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Rasta Monsta
Joined: 12 Jul 2006
Posts: 11733
Location: PacNW
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| Posted: Sun Mar 09, 2008 3:08 am Post subject: |
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Emoore, photobucket would be happy to host your pics for free.
Dan, did you buy the last 931 manifold in German stock, and is that a photo of it?
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Toofah King Bad
- WeiBe (1987 924S 2.5t) - 931 S3
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Cedric
Joined: 27 Aug 2004
Posts: 2809
Location: Sweden
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| Posted: Sun Mar 09, 2008 3:48 am Post subject: |
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hm, i had the series II manifold on my -80 car. Could they have mounted it on late 80 cars ?
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1980 924 Turbo
www.instagram.com/garagecedric/ |
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ideola
Joined: 01 Oct 2004
Posts: 15550
Location: Spring Lake MI
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| Posted: Sun Mar 09, 2008 6:28 am Post subject: |
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| Rasta Monsta wrote: | | Dan, did you buy the last 931 manifold in German stock, and is that a photo of it? |
No, that manifold was acquired used from a certain persona non grata that owed/s me big time.
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erstwhile owner of just about every 924 variant ever made |
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ideola
Joined: 01 Oct 2004
Posts: 15550
Location: Spring Lake MI
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| Posted: Sun Mar 09, 2008 5:14 pm Post subject: |
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I stumbled across this old thread while doing some other research...this might shed a bit more light on the subject:
| gohim wrote: | | The only difference between them is that the #1 original exhaust manifold had a severe problem with cracking. #2 later, the exhaust manifold was modified/reinforced with cast-in ribs on the bottom. #3 in 1981 the size of the studs connecting the exhaust manifold to the downpipe was increased and two aluminum seal rings were substituted in place of the flat gasket at the downpipe connection with a groove cut in the flange face of the exhaust manifold. |
Even though he doesn't explicitly state so, I'm fairly certain based on the description above that gohim is referring to 931 ex manifold...
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erstwhile owner of just about every 924 variant ever made |
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