Adding an O2 bung.
Thread Starter
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
Adding an O2 bung.
I will have to add an O2 bung to my exhaust. It's already in the plans to switch from the 2 sensors to the single O2 sensor. I have never added one of these to a system, and could use some pointers.
Which bank is best to use, and where, on my Hooker side mount headers should I add this bung?
Also, is there a special kit for this kind of thing or should I just drill a hole and have a nut welded on? What size nut, and what tips or precautions should I watch for? Thanks.
Which bank is best to use, and where, on my Hooker side mount headers should I add this bung?
Also, is there a special kit for this kind of thing or should I just drill a hole and have a nut welded on? What size nut, and what tips or precautions should I watch for? Thanks.
Race Director
Joined: Apr 2000
Posts: 17,676
Likes: 201
From: Who says "Nothing is impossible" ? I've been doing nothing for years.
There is a special 02 bung that any good muffler shop should have, the guy that did mine used a torch to make the hole and welded it on in 2 minutes, he was a good welder/fabricator. If it is for a O2 sensor make sure it is welded above the centerline of pipe so condensation doesn't affect it 
Last edited by MotorHead; Nov 12, 2006 at 06:48 PM.
Le Mans Master
Joined: Aug 2003
Posts: 7,720
Likes: 12
From: Chattanooga TN
Most headers can be bought now with the bung installed. You can buy the bung and weld it in. Most GM with a single sensor are in the drivers side. You can also use a spark plug anti-fouler and cut it apart to use as a bung.
Thread Starter
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
Originally Posted by MotorHead
There is a special 02 bung that any good muffler shop should have, the guy that did mine used a torch to make the hole and welded it on in 2 minutes, he was a good welder/fabricator. If it is for a O2 sensor make sure it is welded above the centerline of pipe so condensation doesn't affect it
Ok, so driver's side is more common. Where on the headers is a good place? At the collector or after it?
Race Director
Joined: Nov 2000
Posts: 11,872
Likes: 12
From: Waterloo ontario Canada
I have done a number of them and like the drivers side but the last one I did was on the passengers side. There is no advantage to either side.
You can NOT weld a bung into a ceramic coated header. I put mine right at the collector flange in the exhuast pipe. I have a tap for a spark plug so I just use whatever nut is a little smaller then the required hole, weld the nut into place and then pass the proper drill thorugh the center of the nut and then tap the hole.
I mig weld them into place.
You can NOT weld a bung into a ceramic coated header. I put mine right at the collector flange in the exhuast pipe. I have a tap for a spark plug so I just use whatever nut is a little smaller then the required hole, weld the nut into place and then pass the proper drill thorugh the center of the nut and then tap the hole.
I mig weld them into place.
Drifting
Joined: Oct 2003
Posts: 1,486
Likes: 10
From: Big Pine Key FL
I put mine in the number 8 tube on a BBC, Collector is the best place but I didnt want it hanging out the side on sidemounts... if you put it in a tube keep it close to bend from vertical to horizontal to clear the frame... Also the GM docs say that you should mount the sensor no more than 45* from vertical (wire up sensor down).
Just mig weld it in before coating...
Just mig weld it in before coating...
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Melting Slicks
Joined: May 2002
Posts: 2,717
Likes: 121
From: Sulphur LA
St. Jude Donor '05-'06,'11,'13-'14,'16,'18,'19,'24, '25
I get mine from the local home center, I use a M18 x 1.5 jam nut, its narrow and it works great. I need to install my meters so I can start tuning the carb.
Neal
Neal
Le Mans Master
Joined: Jan 2001
Posts: 6,743
Likes: 1,385
I've done a few...
I use the anti-fouling extensions...cost a couple of bucks for 2 at generic parts places.
I use a hole-saw to make the hole, put a pipe plug in to avoid spatter issues, and then wire-feed weld it on.
On my ceramic headers I ground of some of the coating, welded one on, and then used POR-15 high temp silver afterwards.
I use a hole-saw to make the hole, put a pipe plug in to avoid spatter issues, and then wire-feed weld it on.
On my ceramic headers I ground of some of the coating, welded one on, and then used POR-15 high temp silver afterwards.
Team Owner
Joined: Jul 1999
Posts: 65,492
Likes: 230
From: Orange Park Florida
Originally Posted by 84rzv500r
I put mine in the number 8 tube on a BBC, Collector is the best place but I didnt want it hanging out the side on sidemounts... if you put it in a tube keep it close to bend from vertical to horizontal to clear the frame... Also the GM docs say that you should mount the sensor no more than 45* from vertical (wire up sensor down).
Just mig weld it in before coating...
Just mig weld it in before coating...
Why, specifically, is that 45* from vertical wire up a necessity???
the sensor itself, or airflow charactoristics?? and how important IS this....??
Melting Slicks
Joined: Dec 2005
Posts: 2,441
Likes: 0
Originally Posted by mrvette
Why, specifically, is that 45* from vertical wire up a necessity???
the sensor itself, or airflow charactoristics?? and how important IS this....??
the sensor itself, or airflow charactoristics?? and how important IS this....??
Race Director
Joined: Apr 2000
Posts: 17,676
Likes: 201
From: Who says "Nothing is impossible" ? I've been doing nothing for years.
Originally Posted by carriljc
I use the anti-fouling extensions...cost a couple of bucks for 2 at generic parts places.
I use a hole-saw to make the hole, put a pipe plug in to avoid spatter issues, and then wire-feed weld it on.
On my ceramic headers I ground of some of the coating, welded one on, and then used POR-15 high temp silver afterwards.
I use a hole-saw to make the hole, put a pipe plug in to avoid spatter issues, and then wire-feed weld it on.
On my ceramic headers I ground of some of the coating, welded one on, and then used POR-15 high temp silver afterwards.
Le Mans Master
Joined: Jan 2001
Posts: 6,743
Likes: 1,385
I did not know about that brush-on ceramic...
and the followup with the torch to cure.
The Hi-Temp POR-15 seems to be holding up quite well. I actually put an O2 bung on each side. 1 for the ECM and on the other side for A/F ratio meter.
The Hi-Temp POR-15 seems to be holding up quite well. I actually put an O2 bung on each side. 1 for the ECM and on the other side for A/F ratio meter.
Race Director
Joined: Dec 1999
Posts: 16,945
Likes: 9
I once did a set of headers with the ceramic stuff and heating them in an oven...it sucks and it's ugly. I cleaned the pipes meticulously but I didn't pre heat them, when curing somehow vapor started to excape leaving an ugly bubble finish:
Pro
Joined: Nov 2000
Posts: 594
Likes: 0
From: Tucson AZ
Here are some shots of where I put the O2 bung in my sidemounts:
You have to be careful to get the position correct. Too far up and the sensor will hit the frame, too far down and it will be exposed to possible impact.
Here is how mine looks installed:
These pipes are uncured ceramic soooo, I'll let you know how the ceramic painted at the weld area holds up. I am hoping it cures along with the factory applied ceramic coating.
Craig
You have to be careful to get the position correct. Too far up and the sensor will hit the frame, too far down and it will be exposed to possible impact.
Here is how mine looks installed:
These pipes are uncured ceramic soooo, I'll let you know how the ceramic painted at the weld area holds up. I am hoping it cures along with the factory applied ceramic coating.
Craig