X51 intake

[Ike84]

Has anyone here laid hands on an m96 x51 intake manifold? I am particularly interested in the details of the two sections that cross between each bank's manifold (what we would call, on our standard intakes, the"plenum" and "resonance tube") I have found some top view pics but I would love to know what the actual layout and shape of the passageways are.

 

Thanks!

 

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[UglyDuck46]

I have the X51 kit from the factory on my C4S. What are you looking for? Pictures with an endoscope or something? Or are you looking for actual measurements?


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[Ike84]

Hey duck,


I was wondering if the geometry of the resonance tube and presence of the resonance flapper valve had changed.  I was mistaken and thought that pic I posted was for the 996 generation. Actually it is the 997.  I did find some pics of a jahre 40th that made it look like the plenum and resonance tube setup are the same as stock, and the only actual difference was that the runners for each bank were made of the cast aluminum.

 

Is this the same as on yours?

 

One thing I was still unsure of though was the plenum geometry.  I thought somewhere I read that the IPD plenums and Pedro's techno plenum were based on the x51 design. Funny thing about that though is that both of those plenums have been found to cost power when put on an m96 with stock cam setup (at least for the 2.7 and 3.2L).

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[UglyDuck46]

If you hadn’t written that about the 40 Jahre I would’ve said the plenum was all aluminum, but now I’ll have to check [emoji38]

Will be back…


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[Ike84]

It seems to me like that though the Jahre 40 was touted as coming with the x51 package, it seems like they didn't do the FULL package (like the 3rd radiator was not included) so maybe the intakes are different as well.

 

I can't wait to see what you come back with!

[UglyDuck46]

Hey
Just checked and mine is like the below pic. Two aluminium intakes connected with a rubber plenum at the “front” where the throttle body is mounted and then also a ribbed rubber boot between cyl 3 and 6.



Not much room to take pics, but here’s mine. You can just see the ribbed boot.


Also see the ribs here.


So, much to my surprise it’s not one piece of aluminum.

As for the center radiator mine does not have that either.


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[Ike84]

52 minutes ago, UglyDuck46 said:

Hey
Just checked and mine is like the below pic. Two aluminium intakes connected with a rubber plenum at the “front” where the throttle body is mounted and then also a ribbed rubber boot between cyl 3 and 6.



Not much room to take pics, but here’s mine. You can just see the ribbed boot.


Also see the ribs here.


So, much to my surprise it’s not one piece of aluminum.

As for the center radiator mine does not have that either.


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Thanks a bunch for checking duck.

 

 

 

It's amazing to me how inaccessible the engine is in the 996 compared to the 986. How in the world does anyone work on that motor?  I would think youd need to drop the motor to work on anything under there!

[JFP in PA]

It isn't as bad as it looks; in fact, several things are more accessible on the X51 than they are on the standard engine.  The intake is a very tight fit in the engine bay however.....................

[UglyDuck46]

Yeah that’s right. When you get the airbox out there’s actually pretty good access to stuff. I had the A/C out too and then there’s a lot of space underneath the intake. Which reminded me I took some pics of that out of the way as well.






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[Ike84]

Thanks again for all the info. It's so odd seeing everything backward from the 986 setup lol.

 

Out of curiosity, something I've always wondered - how does the louvered engine bay cover keep water out?  Does the engine bay get wet during a hard rain or isn't he a system where the water gets diverted away from the top of the engine somehow?

[UglyDuck46]

Hey, good question. Had to go check again [emoji38]

The louvres are only “open” in the area where the fan is located and where the Intake for the air box I situated. The rest is closed off.

The engine doesn’t really get wet from above as far as I know.


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