MADNESS exhaust has same defect as MF!!! - Alfa Romeo 4C Forums
 14Likes
Reply
 
LinkBack Thread Tools
post #1 of 38 (permalink) Old 04-08-2017, 04:04 PM Thread Starter
tap
Senior Member
 
Join Date: Dec 2016
Location: Virginia USA
Posts: 206
MADNESS exhaust has same defect as MF!!!

Exhaust was not sounding right so took off the rear diffuser to have a look and yep there is a 4 inch long crack in the Y-pipe weld. Not happy at all!
Attached Images
File Type: jpg 20170408_130228.jpg (200.0 KB, 134 views)
tap is offline  
post #2 of 38 (permalink) Old 04-08-2017, 05:15 PM
Senior Member
 
Join Date: Jan 2014
Location: Wonderful So Cal
Posts: 265
It just seems like the sound resonance on this car is nutz! The irony is this would all be resolved if all manufacturers just moved up 1 click in material thickness at this split. It's really not that hard to figure out, but I guess it's cheaper to just keep grabbing the same generic y joint off the shelf from their parts bin.
F1 SML8R is offline  
post #3 of 38 (permalink) Old 04-08-2017, 08:09 PM Thread Starter
tap
Senior Member
 
Join Date: Dec 2016
Location: Virginia USA
Posts: 206
Quote:
Originally Posted by F1 SML8R View Post
It just seems like the sound resonance on this car is nutz! The irony is this would all be resolved if all manufacturers just moved up 1 click in material thickness at this split. It's really not that hard to figure out, but I guess it's cheaper to just keep grabbing the same generic y joint off the shelf from their parts bin.
And the customer pays the price in the end....no bueno
tap is offline  
 
post #4 of 38 (permalink) Old 04-08-2017, 08:31 PM
Senior Member
 
Join Date: Jan 2014
Location: Wonderful So Cal
Posts: 265
Agreed, go see my posts on the MF thread.
tap likes this.
F1 SML8R is offline  
post #5 of 38 (permalink) Old 04-08-2017, 08:52 PM
Senior Member
 
Join Date: Apr 2016
Location: Toronto, Ontario
Posts: 202
That really sucks. It seems like the Y section is prone to cracking. I wonder if this is caused by the long left and right piping acting as a lever to fatigue the Y pipe, or it is just insufficient material for the Y pipe?
MidLifeCrisis is online now  
post #6 of 38 (permalink) Old 04-08-2017, 09:39 PM Thread Starter
tap
Senior Member
 
Join Date: Dec 2016
Location: Virginia USA
Posts: 206
Quote:
Originally Posted by MidLifeCrisis View Post
That really sucks. It seems like the Y section is prone to cracking. I wonder if this is caused by the long left and right piping acting as a lever to fatigue the Y pipe, or it is just insufficient material for the Y pipe?
I think it is like F1 SML8R said, it's the resonance. That may be why the AR exhaust is shaped the way it is with the drivers side shorter than the passenger and the mid pipe angle. I noticed the AR exhaust vibrates a lot, may that help dissipate the resonance... who knows

Last edited by tap; 04-08-2017 at 09:45 PM.
tap is offline  
post #7 of 38 (permalink) Old 04-08-2017, 10:14 PM
Senior Member
 
JoeCab's Avatar
 
Join Date: Jan 2015
Location: Colorado, USA
Posts: 257
Quote:
Originally Posted by MidLifeCrisis View Post
That really sucks. It seems like the Y section is prone to cracking. I wonder if this is caused by the long left and right piping acting as a lever to fatigue the Y pipe, or it is just insufficient material for the Y pipe?
I think you're on to something here, as we have not had any failures like this with our center-exit exhausts. The arms of the Y on that exhaust are much shorter, hence much less leverage or material to oscillate and cause fatigue.

Centerline International - Alfa Romeo Parts & Accessories

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
- (888) 750-ALFA
JoeCab is offline  
post #8 of 38 (permalink) Old 04-08-2017, 10:59 PM
Senior Member
 
Join Date: Apr 2016
Location: Toronto, Ontario
Posts: 202
Quote:
Originally Posted by JoeCab View Post
I think you're on to something here, as we have not had any failures like this with our center-exit exhausts. The arms of the Y on that exhaust are much shorter, hence much less leverage or material to oscillate and cause fatigue.
That thought crossed my mind. The centre exit exhausts seem to be problem free. The main difference in design, is the lack of the long side exhaust pipes. For the aftermarket side exits, it would probably be a good idea to have the left and right hangers connected together, to support the whole back section as one, rather than using the individual hanger to support each side independently which puts all the stress on the Y pipe.
MidLifeCrisis is online now  
post #9 of 38 (permalink) Old 04-09-2017, 06:10 AM
Senior Member
 
Join Date: Apr 2016
Location: Toronto, Ontario
Posts: 202
Quote:
Originally Posted by tap View Post
I think it is like F1 SML8R said, it's the resonance. That may be why the AR exhaust is shaped the way it is with the drivers side shorter than the passenger and the mid pipe angle. I noticed the AR exhaust vibrates a lot, may that help dissipate the resonance... who knows
I often wondered why the AR mid pipe entered the rear section at an angle instead of straight. After All, they only needed to rotate on 1 more axis in the final bend to make it enter square. As the madness exhaust uses the factory mid pipe, the angle and asymmetrical length would also be required, and clearly this one cracked in a similar fashion to the MF. So it must be attributable to some other cause.
MidLifeCrisis is online now  
post #10 of 38 (permalink) Old 04-09-2017, 11:13 AM Thread Starter
tap
Senior Member
 
Join Date: Dec 2016
Location: Virginia USA
Posts: 206
Quote:
Originally Posted by MidLifeCrisis View Post
I often wondered why the AR mid pipe entered the rear section at an angle instead of straight. After All, they only needed to rotate on 1 more axis in the final bend to make it enter square. As the madness exhaust uses the factory mid pipe, the angle and asymmetrical length would also be required, and clearly this one cracked in a similar fashion to the MF. So it must be attributable to some other cause.
But both pipes are of equal length and straight, which should mean more pressure on the Y joint. Fix is thicker pipe walls at the Y and better weld??
F1 SML8R likes this.
tap is offline  
Reply

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
Is the stock downpipe and factory exhaust diameter a performance bottleneck? MidLifeCrisis Engine and Technical 18 03-16-2017 02:52 PM
FS (Possibly): Madness Autoworks Modena Exhaust w/ CF Tips DerwoodEE Classifieds 2 12-05-2016 10:27 AM
Capristo Exhaust Installation DrPyro2k Engine and Technical 10 10-19-2016 09:19 PM
Installed Madness Autoworks Exhaust + BMC Filter kpg Engine and Technical 37 09-18-2016 01:18 AM
My custom center exit exhaust Call me Al Engine and Technical 22 06-28-2016 11:15 AM

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome