Intake Manifold Discussion

B6 A4
#1

Hi guys finally got around to getting the pictures for you all.

First off I thought it would be better to discuss each individual area, so the engine pic thread doesnt get clutted with different ideas and opinions of each component (I will add the important pics to that thread if necessary)

So onto the pictures

http://audirevolution.net/addons/albums/images/831352006.jpg

http://audirevolution.net/addons/albums/images/474366308.jpg

http://audirevolution.net/addons/albums/images/760122429.jpg

http://audirevolution.net/addons/albums/images/281323295.jpg

http://audirevolution.net/addons/albums/images/304834187.jpg

http://audirevolution.net/addons/albums/images/325897916.jpg

http://audirevolution.net/addons/albums/images/23716580.jpg

http://audirevolution.net/addons/albums/images/29199863.jpg

http://audirevolution.net/addons/albums/images/452063153.jpg

http://audirevolution.net/addons/albums/images/235809697.jpg

http://audirevolution.net/addons/albums/images/536963537.jpg

http://audirevolution.net/addons/albums/images/450104253.jpg

http://audirevolution.net/addons/albums/images/977105829.jpg

http://audirevolution.net/addons/albums/images/565848443.jpg

So the measurements for the throttle body is 70mm and the dimensions for the intake ports is 55mmx26mm or the exact same size as the ports on an intake gasket for 2.7t (remeber audi uses oversized ports on their gaskets). I forgot to measure the MAF, but when I do I will edit this post.

I have added a pic of the cat and soon the exhaust manifold to Joe’s custom exhaust thread as it is a good place to discuss that.

I will soon be getting happy snaps of the cyclinder head shortly and will post up soon

#2

Im at a loss for words. That intake manifold isn’t even close to what I expected. Great job. I bet thats the first time anyone has seen one of these intakes like that.

#3

great work, the intake manifold reminds me of the R32 setup. You can see how the actuators will pull in opposite directions spinning that piece down the middle. It must seal off the top ports of the intake at low RPMs, and then at a certain point engine vacuum is applied pulling the actuators back, spinning that center piece which allows the open ports to line up with the short runner ports.

The throttle body is a bit small, but it may be tough to fit a larger one on there with how the stock mounting is designed.

#4

Good loss for words or bad loss for words? lol

#5

Thanks for explaining that, I was looking at it thinking how the hell does this work.

So does this mean that this manifold is less restrictive than the S4. What would make this manifold more efficient

#6

In some ways yes and in some ways no. They obviously dropped that design and went into a different direction. Im assuming it might have had something to do with either a flaw in the design or the complexity. A little more research will help figgure that part out.

#7

Wow, not what I was expecting at all, very different from the S4 setup. Thanks a lot for getting these pics up, like Count said, I doubt anyone has taken the time to look at one of these intakes like this.

#8

Pardon my ignorance, but what is going through your heads when you look at the manifold? Is it already efficiently designed to the point where there isn’t room for modification? I don’t see anything obvious to change like in the S4’s.

#9

You have to look at every part with the thinking that the auto make( engineer) built the part to be as efficient as possible ( for fuel economy and a power range designated by his bosses). There is always room for performance and just general imporvment it might not always be a tremondous gain but still and improvment over stock. Auto makers set outrageous goals and standards then detune the car or truck that is why there is an aftermarket.

The main point is to see where the most can be gained and if the part is even worth playing with or cost effective.

#10

Ok. so it was obvious what wasnt so efficient on the S4 intake manifold, but looking at what we have it is not so obvious, does anyone have any idea?

Could it be how the Vacuum actuators work or could it be the size of the spaces on the Vacuum Shaft?

#11

is the bottom half of the intake manifold plastic, or just painted black aluminum/magnesium?

#12

I’d been wondering that as well, and it sure does look like plastic to me. It also looks like part of the runners and the ports where it meets the block is plastic. Rather interesting if they did go to plastic for part of the manifold when designing/making it.

#13

The bottom part of the manifold is plastic. I am not sure if it is able to be separated, any idea how I could go about that.

#14

From the looks of it… its plastic and most likely mold injected. The S4 intakes have screws on them that you take out and its kinda obvious that they can be seperated. Not sure your intake can do the same thing. Look for a witness mark on the inside. This should let you know if its one piece

#15

hammer?

#16

If that doesn’t work then you know the proper solution. . . correct?

Bigger Hammer

#17

hahahahahaha…of course the right tool in any situation

#18

gotta love the BFH or even the RBFH

#19

I dont think the hammer is going to work. Looks like the manifold is completely made of plastic and cannot be seperated.

I wonder if it is made from the same or similar material to what JHM use for their intake spacer G-10

#20

I wasn’t able to remove the intake off a 3.0 car I looked at today but from what I can see its much different then the S4 one. This isn’t great for the easy steps of doing inside work but this isn’t the end of the road.

For now. I think we need to look at the exhaust and tune as the first big steps.