A8 / S8 (D2 Platform) Discussion Discussion forum for the D2 Audi A8 and S8 produced from 1994-2002

intake pic

 
Old 09-09-2008, 06:19 AM
  #21  
AudiWorld Super User
 
OOOOya's Avatar
 
Join Date: May 2004
Posts: 2,051
Likes: 0
Received 1 Like on 1 Post
Default How 'bout a shot from the underside?

What bushing material do the shafts run through that causes them to seize up?
OOOOya is offline  
Old 09-09-2008, 06:34 AM
  #22  
Audiworld Junior Member
 
Join Date: Jun 2008
Posts: 128
Likes: 0
Received 0 Likes on 0 Posts
Default

Good luck
TonyA8 is offline  
Old 09-09-2008, 06:55 AM
  #23  
Member
 
Join Date: Jun 2008
Posts: 507
Likes: 0
Received 0 Likes on 0 Posts
Default

Stupid question - How can I do a visual check on pre-facelift model?
alextimmons is offline  
Old 09-09-2008, 07:17 AM
  #24  
AudiWorld Member
 
Join Date: Nov 2004
Posts: 415
Likes: 0
Received 0 Likes on 0 Posts
Default I think these do not exist pre-facelift

Instead, there's a single vacuum-operated valve in the center of the manifold.
-OvO- is offline  
Old 09-09-2008, 07:20 AM
  #25  
AudiWorld Super User
 
Join Date: Jul 2001
Posts: 18,462
Likes: 0
Received 0 Likes on 0 Posts
Default Just have somebody rev the engine with the beauty covers off

Here is a picture of the single diaphram on the 32 valve motor, the 40 valve motor has two of them.

Once a certain RPM is reached, the diaphram relaxes (as shown in this picture) and changes the length of the intake runner in the manifold. So you'll see it "suck in" and "relax" as the engine is rev'd.....somewhere around 3,000 RPM as I recall and for the 40 valve, there are two RPM's that cause each one to move.

At least I think it's normally sucked in. If your linkage is broken, it's probably because it's seized.

<img src="http://www.audipages.com/Tech_Articles/enginemechanical/tbp12.JPG">
PaulW is online now  
Old 09-09-2008, 07:45 AM
  #26  
Member
 
Join Date: Jun 2008
Posts: 507
Likes: 0
Received 0 Likes on 0 Posts
Default So I disconnected all those hoses - now what?

Kidding!

Thanks for the picture, should help. If I remember correctly there is a diaphragm that sucks in when the RPM reaches a certain level. Is the one i'm thinking of for the DOHC system?
alextimmons is offline  
Old 09-09-2008, 01:32 PM
  #27  
AudiWorld Super User
 
Join Date: Jan 2005
Posts: 2,564
Likes: 0
Received 0 Likes on 0 Posts
Default figurez - I'll be going right thru New Haven tomorrow ~ noon, but...

...I'll be mit bossage.

Tho if you wanted to hook up I figure ya'd have ping'd me 8-).

Have a great trip, enjoy.
pkrasusky is offline  
Old 09-09-2008, 04:02 PM
  #28  
AudiWorld Super User
 
Join Date: Apr 2003
Posts: 2,300
Likes: 0
Received 0 Likes on 0 Posts
Default Here is my Dyno plot for the A8 ~ you can see how the intake makes a huge difference

<center><img src="http://pictureposter.audiworld.com/55364/dyno01.jpg"></center><p>Ok, anyone familiar with how an engine dyno plot SHOULD look, can easily see the huge difference a variable length intake makes.

You can see the jolt at 4200 RPM where the intake valves flop over. Note how power suddenly INCREASES, where it should be dropping off to crap.
Jkay is offline  
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Dr.Duct_Mossburg
S4 / RS4 (B5 Platform) Discussion
3
12-15-2005 08:52 AM
fusilier
Texas Discussion
0
05-27-2005 08:36 AM
legalizecannabis
12v V6 Discussion
11
02-07-2005 07:26 AM
mpwolf
S4 / RS4 (B5 Platform) Discussion
0
07-07-2003 05:59 PM
A42.0rgy
A4 (B5 Platform) Discussion
8
12-05-2002 11:00 PM


Thread Tools
Search this Thread
Quick Reply: intake pic


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: