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Dammit
Hockenheim


Joined: 23 Sep 2016
Posts: 724



PostPosted: Mon Oct 02, 2017 9:32 pm    Post subject: M96 and M97 - to what extent are parts compatible? Reply with quote

Context: I'd (potentially) like to use parts from the M97 for my engine build, as (for example) the X51 intake for the M96 is NLA.

From staring at Google images my belief is that you cannot use the M97 intake on the M96, but it would appear that the exhaust manifold can be used across the two - which would be handy as the 3.8l X51 manifolds are available.

Does anyone know for certain?
 
  
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paul987
Albert Park


Joined: 27 Feb 2015
Posts: 1519
Location: east mids


PostPosted: Mon Oct 02, 2017 11:09 pm    Post subject: Reply with quote

Excellent question Pop Corn

GT4 is very knowledgeable on subjects like this.. sadly I've not seen him post for a while Dont know
_________________
2001 996 C4S - Silver
2006 987 Boxster S 3.2 - Guards red
 
  
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wasz
Kyalami


Joined: 28 Dec 2012
Posts: 1753


1999 Porsche 996 Carrera 2

PostPosted: Tue Oct 03, 2017 7:33 am    Post subject: Reply with quote

the 997 x51 manifold looks just like the stock 3.4 manifold...but is it fatter at 48mm?

i heard the stock 996 header a better design than stock 997, again not sure on diameters.

these are 997:


I read the exhaust is interchangeable.

You just need to reposition (weld) the tail pipes to suit the bumper.
 
  
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Dammit
Hockenheim


Joined: 23 Sep 2016
Posts: 724



PostPosted: Tue Oct 03, 2017 8:31 am    Post subject: Reply with quote

I was hoping to keep my Cargraphic exhaust and make any required adaptations in the (likely) top gear 200 cell cat sections.

I think diameter is very important to the manifold- flow bench tests on a tubular, equal length manifold of smaller diameter showed a surprising restriction.
 
  
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Dammit
Hockenheim


Joined: 23 Sep 2016
Posts: 724



PostPosted: Wed Oct 11, 2017 5:15 pm    Post subject: Reply with quote

Message from an eBay seller with regards to an intake manifold:

Yes. The bolt patterns are the same on all m96 engines. Boxster 996 997 and so on. The manifold will physically bolt on, however you will have to change and or modify a few brother hoses and such but that's it.

Which I'd love to be true.

This does look very similar:



However note the zig-zag pattern of this 987 manifold:



Which looks to me to match the upper face of the M96 intake runners:



The underside of which looks like this - a straight line:



The orientation is based on where the injector goes - I'm making the assumption that it faces down into the head (which seems reasonable, but I'd love to be told I've made a mistake!)

Have I missed something, or is the eBay seller wrong?
 
  
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Dammit
Hockenheim


Joined: 23 Sep 2016
Posts: 724



PostPosted: Fri Oct 13, 2017 12:55 pm    Post subject: Reply with quote

Just to close this out, I'm satisfied that the M96 head is not compatible with the intake from the M97.
 
  
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