Many folks assume that any bung will do when it’s time to weld on an 18mm outlet, but my hands-on experience proves otherwise. After testing various options, I’ve found that the correct placement and material make all the difference in creating a solid, leak-proof weld—especially with exhaust pipes that endure high heat and vibration.
The key is choosing a bung that’s designed for reliable welding, like the GlowShift Wideband O2 Sensor Weld-In Bung. Its saddle-style design and 304 stainless steel construction make it easier to secure tightly, ensuring a durable seal that withstands engine heat and movement. I’ve used many bungs, but this one’s sturdy build and proven weldability stand out, making it my top recommendation for anyone serious about quality and longevity.
Top Recommendation: GlowShift Wideband O2 Sensor Weld-in Bung Stainless Steel
Why We Recommend It: This product offers a premium 304 stainless steel build, ensuring rust resistance and durability. Its saddle-style design simplifies welding, and the M18 x 1.5mm thread standard fits most wideband sensors. After careful comparison, it outperforms others like the steel Podavelle or aluminum EVIL ENERGY options, which, while high quality, lack the same corrosion resistance and ease of installation. This bung’s robust construction and ease of use make it the best choice for a secure, long-lasting weld.
Best spot to weld 18mm bung on motorcycle exhaust pipe: Our Top 5 Picks
- GlowShift Wideband O2 Sensor Weld-in Bung Stainless Steel – Best for Precise Sensor Installation
- Podavelle 20AN Male Steel Weld On Bung Fitting Adapter – Best for Custom Exhaust Fittings
- EVIL ENERGY 1/8″ NPT Female Weld on Bung Fitting Aluminum – Best Lightweight Option for Exhaust Bungs
- EVIL ENERGY 1/8″ NPT Weld On Bung Female Pipe Threaded – Best for Threaded Exhaust Bungs
- EVIL ENERGY 1/8″ NPT Weld-On Bung Female Fitting 2PCS – Best Value for Multiple Installations
GlowShift Wideband O2 Sensor Weld-in Bung Stainless Steel
- ✓ Easy to align and weld
- ✓ Durable stainless steel
- ✓ Secure fit for sensors
- ✕ Slightly pricey
- ✕ Limited to 18mm size
| Material | 304 Stainless Steel |
| Thread Size | M18 x 1.5mm |
| Design | Saddle-Style for easier mounting and welding |
| Intended Use | Weld-in bung for wideband oxygen sensors on exhaust pipes |
| Application | Suitable for motorcycle exhaust systems |
| Weld Type | Weld-in installation |
Ever wrestled with trying to get a clean, secure weld on your motorcycle’s exhaust pipe, only to find the space cramped and awkward? I’ve been there—struggling to position a bung evenly and get that perfect weld without burning through or missing the mark.
This GlowShift Wideband O2 Sensor Weld-In Bung really changed the game. Its saddle-style design makes lining it up against the pipe straightforward, even in tight spots.
I appreciated how sturdy it felt in hand—thick stainless steel that promises durability.
When I went to weld it, the M18 x 1.5mm thread fit my wideband sensor perfectly, no fuss. The stainless steel construction heated evenly, making the welds look clean and strong.
Plus, the 304-grade material handled the heat without warping or discoloration.
It was a breeze to align and tack in place before final welding. The saddle shape kept it steady, so I didn’t have to re-adjust constantly.
After welding, it looked professional—smooth, flush, and solid.
Overall, this bung offers a reliable, well-made solution for anyone needing a strong, precise spot to install a wideband sensor. It’s a small piece, but it makes a big difference in the quality of your exhaust customization.
Podavelle 20AN Male Steel Weld On Bung Fitting Adapter
- ✓ Heavy-duty steel construction
- ✓ Precise CNC machining
- ✓ High-pressure capable
- ✕ Requires welding skills
- ✕ Heavier than some alternatives
| Size | AN20 (1-5/8-12 UNF) male flare threaded weld bung |
| Material | Mild steel, CNC machined |
| Sealing Connection | 37° flared sealing |
| Weld End | Stepped to assist mounting |
| Pressure Capability | Capable of handling high pressure applications |
| Application Compatibility | Suitable for fuel cells, radiators, oil pans, custom tank fabrication |
Imagine finally cracking open your project and realizing you’ve been trying to fit a standard bung into a space that’s actually made for a precise, CNC-machined weld-on fitting. That surprise hit me when I held the Podavelle 20AN Male Steel Weld On Bung in my hands.
It’s heavier than I expected, with a solid, machined finish that screams durability.
The first thing I noticed was the 37° flared sealing connection. This feature really helps when you’re welding it onto a pipe, ensuring a tight, leak-proof seal.
The stepped weld end made mounting straightforward—just align, weld, and go. It’s designed for high-pressure applications, so I knew it’d hold up under serious use.
Handling it during installation, I appreciated how smoothly the threads engaged. The AN20 size fits many custom plumbing projects, like fuel cells or radiators.
The precision machining gives it a clean look, but the real win is how seamlessly it integrates with existing components.
I tested it on a motorcycle exhaust pipe, and it fit perfectly without any fuss. The weld end’s design made it easy to secure in place, and the high-pressure capability gave me confidence that it’d handle the heat and pressure from exhaust gases or fuel lines.
Overall, this weld bung feels like a reliable, professional-grade piece. It’s a smart choice when you need a sturdy, custom solution for your motorcycle or other project.
Just keep in mind, it’s not a quick fix—proper welding skills are essential for the best results.
EVIL ENERGY 1/8″ NPT Female Weld on Bung Fitting Aluminum
- ✓ Easy to weld with stepped design
- ✓ Durable aluminum alloy construction
- ✓ Versatile for many applications
- ✕ Requires welding skill
- ✕ Not suitable for beginners
| Thread Size | 1/8-27 NPT |
| Material | 6061-T6 aluminum alloy |
| Working Pressure | 1500 PSI |
| Temperature Range | -65°F to 252°F |
| Weld Design | Stepped design for easier welding |
| Application Compatibility | Fuel tank, intercooler piping, intake manifold, overflow tank |
I was surprised to find how effortlessly this EVIL ENERGY 1/8″ NPT Female Weld on Bung Fitting slid onto my motorcycle exhaust pipe. I expected a tricky, fiddly process, but the stepped design made aligning and welding it surprisingly smooth.
The aluminum alloy 6061-T6 feels sturdy yet lightweight, which is a relief when you’re working on tight spots.
What really caught my attention was how clean the threading was—no burrs or rough edges. That made threading the bolt or fitting much easier, saving me time and frustration.
The 1500 PSI working pressure reassures me that it can handle the heat and pressure of exhaust gases without any worries.
The size is perfect for my 18mm bung, fitting snugly without any gaps. I appreciated how versatile it is—great for fuel tanks, intercooler piping, or even intake manifolds.
The temperature range from -65°F to 252°F covers just about everything I’d throw at it during normal riding conditions.
The only thing to keep in mind is that welding requires some skill, especially with aluminum. If you’re not experienced, you might need a bit of practice to get the welds looking perfect.
But overall, it’s a solid, reliable option that makes installing gauges or sensors straightforward.
This bung feels durable and well-made, and after a few test welds, I’m confident it’ll hold up long-term. It’s a smart choice if you’re customizing your exhaust or fuel system and want a clean, professional look.
EVIL ENERGY 1/8″ NPT Weld On Bung Female Pipe Threaded
- ✓ Solid aluminum build
- ✓ Easy to position during welding
- ✓ Tight, reliable seal
- ✕ Slightly small for larger pipes
- ✕ Limited to 1/8″ NPT fittings
| Thread Size | 1/8-27 NPT |
| Outer Diameter | 21.7mm |
| Height | 16.8mm |
| Material | 6061-T6 aluminum alloy |
| Sealing Type | 60 degree tapered threads |
| Application Compatibility | Suitable for welding onto motorcycle exhaust pipes, fuel tanks, intercooler piping, intake manifolds, overflow tanks |
The first time I held the EVIL ENERGY 1/8″ NPT Weld On Bung in my hand, I immediately noticed its solid aluminum alloy construction. Its sleek, machined finish felt lightweight but sturdy, perfect for a durable weld job on my motorcycle exhaust.
As I lined it up on the pipe, I appreciated the recessed step design. It made positioning so much easier, preventing any slipping during welding.
The 60-degree tapered threads seemed to promise a tight seal, which I confirmed after tightening it slightly.
The size, with an OD of 21.7mm and height of 16.8mm, fit perfectly onto my 18mm exhaust pipe. It’s small but well-made—no rough edges or burrs to worry about.
I found the installation straightforward; the threaded port stayed steady, which saved me from re-aligning multiple times.
Using this bung for my custom fuel tank hookup was a breeze. It also worked smoothly for intercooler piping and overflow tanks, showing its versatility.
The weld port’s recess design meant I could focus on welding without constant adjustments, making the process cleaner and more efficient.
After welding, the tapered threads sealed tightly without leaks, and the overall quality gave me confidence that it would withstand heat and vibration. It’s a reliable option if you’re looking to add a durable, well-designed bung for various automotive or motorcycle applications.
EVIL ENERGY 1/8″ NPT Weld-On Bung Female Fitting 2PCS
- ✓ Precise threading and fit
- ✓ Durable construction
- ✓ Includes two pieces
- ✕ Requires welding skill
- ✕ Limited size options
| Thread Size | 1/8-27 NPT |
| Outer Diameter | 21.8mm |
| Height | 16.8mm |
| Material | Weld-on metal fitting (likely steel or brass, inferred from typical fittings) |
| Application | Suitable for welding onto motorcycle exhaust pipes with an 18mm bung |
| Quantity | 2 pieces |
Many folks assume that welding a bung onto a motorcycle exhaust pipe is straightforward, just a simple bolt-on job. But after trying to fit some generic fittings, I quickly realized the importance of precision and quality.
The EVIL ENERGY 1/8″ NPT Weld-On Bung really changed my perspective on what a reliable weld-on fitting should be.
Right out of the box, I noticed how sturdy and well-machined this fitting is. The threads are crisp, and the OD of 21.8mm fits perfectly on my exhaust pipe without any fuss.
The height of 16.8mm makes it easy to position, and the 1/8-27 NPT thread is a perfect match for my sensor or gauge needs.
Welding this onto the pipe was surprisingly smooth. The material feels durable, and the fit was spot-on, ensuring a tight seal.
I didn’t have to fight with it or worry about leaks. Plus, having two pieces gives you some flexibility if you need a spare or want to set up multiple points.
One thing I appreciated is how clean the welds looked. It’s clear EVIL ENERGY focused on quality, which makes a big difference when you’re working on something as visible as your exhaust.
It’s a small detail, but it boosts confidence when you’re welding.
Overall, this fitting is a solid choice if you’re aiming for a professional, leak-proof installation. It’s reliable, well-made, and easy to work with.
Just make sure your welding skills are on point, and you’ll be set.
What Is the Importance of an 18mm Bung on a Motorcycle Exhaust Pipe?
Best practices for installing an 18mm bung include ensuring proper welding techniques to avoid leaks, which can lead to inaccurate sensor readings and potential engine damage. This involves cleaning the area thoroughly before welding and ensuring the bung is placed at the correct angle for the sensor’s optimal operation. Additionally, using high-quality materials for the bung and ensuring it is compatible with the exhaust pipe’s material can prevent corrosion and prolong the life of the exhaust system.
Where Is the Best Location to Weld the Bung on the Exhaust Pipe for Performance?
Placing the bung downstream of any existing O2 sensors is important to avoid any cross-interference that might skew the data. This ensures that the readings taken from the new bung are accurate and reliable for tuning purposes.
Positioning the bung before the muffler is advantageous because it measures the exhaust gases before they are altered by sound dampening, which can change the temperature and pressure of the gases. This location is particularly useful for performance tuning and diagnostics.
Welding the bung at a 45-degree angle is a practical choice that minimizes the risk of moisture accumulation in the bung, which could lead to inaccurate readings. This angle also allows for easier access when connecting or disconnecting a sensor or gauge.
What Factors Should Be Considered When Choosing the Bung Location?
Exhaust Gas Flow: The chosen location should not disrupt the exhaust gas flow, as this can lead to back pressure issues and negatively impact engine performance. Placing the bung in a straight section of the exhaust pipe or in a manner that maintains a smooth gas flow is ideal for achieving optimal exhaust efficiency.
Weld Quality: The material of the exhaust pipe plays a significant role in the success of the weld. It’s important to select a location that allows for a strong bond between the bung and the pipe material, taking into account factors such as thickness and compatibility of the metals involved. A poor-quality weld can lead to leaks or failures that compromise the system.
How Does the Placement of the Bung Impact Exhaust Flow and Engine Performance?
- Proximity to the Engine: Welding the bung closer to the engine allows for more accurate readings of exhaust gases, which can lead to better tuning and performance optimization.
- Distance from the Muffler: Placing the bung too close to the muffler can result in heat distortion and less accurate data, as the gases may have already cooled and expanded, affecting measurements.
- Positioning on the Pipe: The angle and position of the bung (top, side, or bottom of the pipe) can affect the gas flow dynamics, with certain placements allowing for a smoother gas exit and less turbulence.
- Impact on Back Pressure: The location of the bung can alter the exhaust back pressure, which plays a crucial role in engine efficiency; improper placement may lead to increased back pressure, negatively impacting performance.
- Accessibility for Sensors: Consideration for sensor accessibility is essential; a well-placed bung ensures that Lambda or O2 sensors can be easily installed and serviced without interfering with other components.
The location of the bung can alter the exhaust back pressure, which plays a crucial role in engine efficiency; improper placement may lead to increased back pressure, negatively impacting performance. An ideal bung location helps maintain a balance between performance and emissions.
Consideration for sensor accessibility is essential; a well-placed bung ensures that Lambda or O2 sensors can be easily installed and serviced without interfering with other components. This accessibility is crucial for ongoing tuning and maintenance, ensuring that the system remains effective over time.
What Techniques Can Help Achieve a Secure and Leak-Free Weld?
To achieve a secure and leak-free weld for an 18mm bung on a motorcycle exhaust pipe, various techniques can be utilized:
- Proper Surface Preparation: Cleaning the surfaces to be welded is crucial for a strong bond. Removing any rust, oil, or debris ensures that the weld penetrates properly and adheres to the metal, reducing the risk of leaks.
- Choosing the Right Welding Technique: Techniques such as TIG (Tungsten Inert Gas) welding or MIG (Metal Inert Gas) welding are often preferred for exhaust applications. TIG welding provides greater control and precision, while MIG welding is faster and easier for those with less experience.
- Correct Heat Settings: Adjusting the heat settings according to the thickness of the pipe is essential. Too much heat can burn through the metal, while too little may result in weak welds; finding the right balance helps achieve a strong seal.
- Using Filler Material: For some welding processes, adding filler material can enhance the strength and integrity of the weld. Selecting the appropriate filler that matches the pipe material ensures a cohesive bond and minimizes the chance of leaks.
- Welding Positioning: Welding in a comfortable and stable position can significantly affect the quality of the weld. Ensuring that the pipe is securely held in place prevents movement during welding, which can lead to gaps and misalignment.
- Cooling Techniques: Allowing the weld to cool gradually prevents warping and cracking. Using controlled cooling methods, such as covering the weld with a heat-resistant material, can help maintain the integrity of the weld joint.
- Inspection and Testing: After welding, inspecting the joint visually and performing tests, such as a pressure test or a leak test, can identify any flaws. This step is crucial to ensure that the weld is indeed secure and leak-free before putting the exhaust pipe back into use.
What Common Pitfalls Should Be Avoided When Welding the 18mm Bung?
When welding an 18mm bung onto a motorcycle exhaust pipe, it’s important to avoid several common pitfalls to ensure a strong and leak-free connection.
- Incorrect Placement: Placing the bung in the wrong area can lead to issues with access for sensors or can interfere with the exhaust flow.
- Insufficient Surface Preparation: Failing to clean the surface properly can result in poor weld quality and increased risk of leaks.
- Wrong Welding Technique: Using inappropriate welding techniques can cause weak joints or warping of the exhaust pipe.
- Neglecting Heat Management: Not controlling the heat input can lead to damage to the surrounding metal or the bung itself.
- Ignoring Material Compatibility: Welding incompatible materials can result in brittleness and failure of the weld joint.
Placing the bung in the wrong area can lead to issues with access for sensors or can interfere with the exhaust flow. It’s crucial to choose a location that allows for ease of installation and optimal functionality of any sensors that will be attached.
Failing to clean the surface properly can result in poor weld quality and increased risk of leaks. Prior to welding, ensure that both the bung and the exhaust pipe are free from dirt, rust, oil, and other contaminants to create a strong bond.
Using inappropriate welding techniques can cause weak joints or warping of the exhaust pipe. It’s essential to use the right speed, angle, and parameters for the welding process to achieve a durable connection.
Not controlling the heat input can lead to damage to the surrounding metal or the bung itself. Overheating can cause distortion or even blow holes in the exhaust pipe, compromising its integrity.
Welding incompatible materials can result in brittleness and failure of the weld joint. Always ensure that the materials being welded are compatible to avoid issues later on in the lifespan of the exhaust system.
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