O2 Bung Installation - Alfa Romeo Bulletin Board & Forums
 
LinkBack Thread Tools Display Modes
post #1 of 10 (permalink) Old 10-18-2012, 10:55 AM Thread Starter
Registered User
 
iachella's Avatar
 
Join Date: Sep 2005
Location: Concord, CA
Posts: 2,170
O2 Bung Installation

I had a shop install a bung on a section of the exhaust that I brought to him. Are there any concerns about the protrusion into the exhaust stream? I am wondering if he should have not put it in so deep.
Attached Images
 

Stefano
Concord, CA
iachella [at] gmail [dot] com
iachella is online now  
Sponsored Links
Advertisement
 
post #2 of 10 (permalink) Old 10-18-2012, 09:50 PM
Registered User
 
lgowin's Avatar
 
Join Date: Jun 2005
Location: Denver
Posts: 340
I've never looked at how far o2 sensors extend into the exhaust stream, but I wouldn't think they would have to be shielded from the flow. I've seen a lot of articles about retrofitting these to older cars, but have never seen any reference to minimizing how far the sensor extends into the pipe.

Regards,
Lawrence

_______________________
'71 Alfa GTV
'88 Porsche 911
'02 Audi S6
lgowin is offline  
post #3 of 10 (permalink) Old 10-19-2012, 11:02 AM
Registered User
 
Join Date: Mar 2005
Location: Milpitas CA
Posts: 2,984
look at it with the OČ installed as long as the tip does not hit the other side.

as for flow it is common to put them where a merge or a split happen.
so one common spot is in the v part of a merge. the other common place is on the input side of the cat were the flow fans out to the larger diameter of the cat.


The Alfa oem fitment (v6) is kinda late in the merge and I think was placed there due to space limitations.

The maganaflow downpipes put it in before the merge where there is a tiny crossover and it is in the crossover. kinda a large bung sealed all around with 2 holes on each side. Each hole welded to the side of one pipe. so it looks like the bung was just squeezed in-between the two pipes.

1987 black Milano Verde, 1987 (made in 1986)blue $200 gold with ABS and LSD
1972 White spider 2000 Veloce

Last edited by slyalfa; 10-19-2012 at 11:05 AM.
slyalfa is offline  
Sponsored Links
Advertisement
 
post #4 of 10 (permalink) Old 10-19-2012, 06:20 PM
Duk
Registered User
 
Duk's Avatar
 
Join Date: Aug 2007
Location: South Australia
Posts: 1,733
Garage
I wouldn't worry about it.
That bit of protruding metal and the EGO sensor's tip aren't going to limit your power output, there will be plenty of other aspects of the engine/exhaust that will do that 1st.

Slowly Progressing Vortech Supercharged 1990 Alfa Romeo 75 Potenziata. Out of Action Twin-Charged 1988 AW11 MR2. Current Daily Driver, The Glorified Taxi 2006 BF FPV F6 Typhoon.
Duk is offline  
post #5 of 10 (permalink) Old 10-20-2012, 08:47 AM
Registered User
 
eedneco's Avatar
 
Join Date: Jan 2007
Location: Spain
Posts: 558
You can always do some profile trimming with a die grinder if you have such good access to where you put it, as we can see in the pic. Just a thought.
One way or another, the sensor itself is a bigger air blockage that the bung end. I suppose it depends whether you intend to keep the sensor in permanently or just for temporary tuning.
/Neil

74 GTV
Alcala de Henares, Spain
eedneco is offline  
post #6 of 10 (permalink) Old 10-27-2012, 07:01 AM Thread Starter
Registered User
 
iachella's Avatar
 
Join Date: Sep 2005
Location: Concord, CA
Posts: 2,170
Thanks for your replies everyone. This is just what I needed to feel comfortable. I will button up my exhaust pipes and get on with my project.

Cheers

Stefano
Concord, CA
iachella [at] gmail [dot] com
iachella is online now  
post #7 of 10 (permalink) Old 11-04-2012, 11:35 AM
Registered User
 
ToonRboy's Avatar
 
Join Date: Jan 2007
Location: Illinois
Posts: 2,269
Send a message via Yahoo to ToonRboy Send a message via Skype™ to ToonRboy
I thought they just drilled a hole the size of the thread and tack-welded the bung to the outside of the pipe? Since the pipe is round and the nut flat, you then run a bead around the circumference. The sensor itself will extend past the nut into the exhaust stream.

I have the Euro downpipes and am debating whether to have the bung welded on, or to use a bung clamp.
ToonRboy is offline  
post #8 of 10 (permalink) Old 11-04-2012, 01:25 PM
Registered User
 
eedneco's Avatar
 
Join Date: Jan 2007
Location: Spain
Posts: 558
It doesn't need to be fusion welded, silver solder works fine for this.
/Neil

74 GTV
Alcala de Henares, Spain
eedneco is offline  
post #9 of 10 (permalink) Old 03-29-2013, 01:11 AM
Registered User
 
Join Date: Feb 2004
Location: So.Cal.
Posts: 226
look at various constructions of sensors i.e. a cutaway

Depending on the construction of the outer shell of the sensor it has small holes in it to let exhaust gas into to it as long as none of the holes are blocked from gas flow and it doesn't touch the other side of exhaust pipe it should be okay. Also from the exterior wire side air is allowed to go inside the sensor's interior down along the wires.
Note there are different designs, older and newer and some work differently than others look it up in comprehensive automotive technicians book descriptions. Older ones were 2/3 wires newer ones with built in heaters have 4 wires. no hard and fast rule ....evolution.But they were specific to each model car by the manufacturer.

Alfaross69
'61 Guilietta Sprint
'69 1750 GTV
'74 2000 GTV

"No detail too small not to obsess over"
Alfaross69 is offline  
post #10 of 10 (permalink) Old 03-31-2013, 08:10 AM Thread Starter
Registered User
 
iachella's Avatar
 
Join Date: Sep 2005
Location: Concord, CA
Posts: 2,170
Quote:
Note there are different designs, older and newer and some work differently than others look it up in comprehensive automotive technicians book descriptions. Older ones were 2/3 wires newer ones with built in heaters have 4 wires. no hard and fast rule ....evolution.But they were specific to each model car by the manufacturer.
In this case it is a wide band. Something like 6 wires.

Stefano
Concord, CA
iachella [at] gmail [dot] com
iachella is online now  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Alfa Romeo Bulletin Board & Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may 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 Off
Pingbacks are Off
Refbacks are Off

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