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pietrzj
Spa-Francorchamps


Joined: 19 Mar 2014
Posts: 263



PostPosted: Tue Jun 28, 2016 6:33 pm    Post subject: Bischoff or Gillet - this is exhausting! Reply with quote

Hi,

I thought this would be easy. I will be replacing my sparkplugs and leads later in the summer and therefore i will have to remove at least one muffler (silencer in old speak). I will replace their bolts with stainless ones and I guess there will be gaskets too so i need to know which type i have. The number on the side is 993.111.045.13. So what have i got?
 
  
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graemeho
Nürburgring


Joined: 16 Jan 2012
Posts: 417
Location: Lincolnshire


PostPosted: Tue Jun 28, 2016 7:52 pm    Post subject: Reply with quote

The type of box (gillet or bischoff) should be stamped on the box next to the part number , plus the month/year of manufacture. The bischoff boxes can also be identified by the flared end connections. The gillet type have an olive type end on them. There aren't any gaskets to worry about. The boxes just rely on a clamp
And olive type ring to make the seal . Photo of some of my bischoff type c/w bypass pipe (now binned in favour of rsr's)





Hope this helps Thumb
 
  
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ch3tman
Hockenheim


Joined: 08 Dec 2012
Posts: 706
Location: South Bucks

1995 Porsche 911

PostPosted: Tue Jun 28, 2016 8:07 pm    Post subject: Reply with quote

If you can see the flange/clamp type in situ, here are the differences:







Courtesy of pelicanparts:

Quote:
The left 2 mufflers are Gillett, they have the biscuit integral w/ the pipe exit. The right 2 are Bischof. , they have an expanded section which a separate biscuit fits into



I'm sure someone who knows the part numbers will be along to advise Smile.
 
  
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Jet Jock
Montreal


Joined: 18 Jul 2005
Posts: 549
Location: Dublin


PostPosted: Tue Jun 28, 2016 10:21 pm    Post subject: Reply with quote

I think these are the part numbers:

993 111 045/046 04 - Manufactured by Bischoff
993 111 045/046 07 - Manufactured by Bischoff M159
993 111 045/046 11 - Manufactured by Gillett
993 111 045/046 12 - Manufactured by Gillett M159
_________________
993 C2, RSR's, Cargraphic 100 Cell Cat, Turbo Twist Hollows, Brembo Big Reds Turbo Brakes, Big Ovals, Wayne Schofield Remap, KW Supersport set up by Chris Franklin, RS engine and transmission mounts, Fabspeed induction kit, FD Motorsport SSK and Golden Rod, MPL Clutch Slave Cylinder, HID conversion...

instagram.com/bazzer_a
 
  
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decgraham
Barcelona


Joined: 17 Sep 2008
Posts: 1340
Location: Spain


PostPosted: Wed Jun 29, 2016 7:59 am    Post subject: Reply with quote

Here you go Porsche tech sheet on the exhaust systems. I had to shrink one of the PDFs to be able to load it up on here so not as clear as it should be but still readable.

ATB Smile
_________________
1995 993 C2 Cab TipS in Guards Red
 



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wozy
Österreich


Joined: 06 Feb 2013
Posts: 889
Location: Worcestershire


PostPosted: Wed Jun 29, 2016 3:58 pm    Post subject: Reply with quote

Just to confuse things OP ........... Mine has one of each. Very Happy
_________________
Porsche Cars of Great Britain launched the 993 in the UK in early December 1993 registering 12 x UK cars on the 6th & 7th of that month; mine is one of them.

993 C2. MBM. C4 mounts, RSRs, RS Short shifter. RS steering wheel. FSDs & M033s
Previous 2.7S, 3.2, 964 and 968CS
 
  
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Endoman
Barcelona


Joined: 11 Apr 2011
Posts: 1351
Location: Bolton U.K.


PostPosted: Wed Jun 29, 2016 5:53 pm    Post subject: Reply with quote

The silencers are interchangeable the cats are not (unless you use adapters)
Only gaskets are on the manifold, big olives are use on the Bischoff unions, not needed on Gillet. A Dremel is your best friend when replacing exhausts.
The olives clean up nicely with a bit of wire wool and don't be temped by JP fitting kit it's terrible, new clamps and olives are pricey, but rarely need replacing. I use good quality stainless allen bolts and nuts on the clamps and silencer straps (stick with OE).
I recently bought a pair of decent used silencers to modify as I'm not happy with the Dansk replacements.
_________________
Porsche 944 S2 Coupe Guards Red
Porsche 993 Coupe 9m RS Replica
 
  
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pietrzj
Spa-Francorchamps


Joined: 19 Mar 2014
Posts: 263



PostPosted: Wed Jun 29, 2016 7:02 pm    Post subject: Reply with quote

Hanks all. Endoman - do you have a good source for stainless nuts? I don't think nylock nuts are appropriate for hot exhausts so i wondered if you hadany alternative ideas?
 
  
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Barryn
Monza


Joined: 19 Oct 2013
Posts: 209
Location: Cumbria and West London


PostPosted: Wed Jun 29, 2016 8:34 pm    Post subject: Reply with quote

Hi Pietrzj

You can get all stainless steel locknuts, I have them fitted and they work great.

http://www.westfieldfasteners.co.uk/A2_Nut_Aerotight_M.html
_________________
1997 CarreraS
 
  
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Endoman
Barcelona


Joined: 11 Apr 2011
Posts: 1351
Location: Bolton U.K.


PostPosted: Sat Jul 02, 2016 1:48 pm    Post subject: Reply with quote

There are stainless lock nuts which do not have plastic inserts. I used the shouldered ones with gripping mating surface on the clamps. Fabspeed supplied copper plated ones for the manifold and Kath Burrows had used the same on the 944 manifold. I understand some stainless will gall if subject to very high temperatures and cheapo stainless bolts will stretch distorting the threads and need cutting off. Found that out the hard way. Still playing with my exhaust, the spare silencers are being modified by a local custom exhaust manufacturer (Pipewerx) to my own spec. a Maxflo type arrangement.
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Porsche 993 Coupe 9m RS Replica
 
  
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