996/997 COOLANT PIPE WELDING

Chris McNeal • March 21, 2022

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One of the major issues that plagues the Mezger engine found in 996/997 cars is the metal coolant pipes that live under the intake manifold. In factory orientation the pipes are press fit into each other and mated together using glue. There are a couple of problems we have seen with this method of joining these pipes together. One issue we have seen is that the tolerances for the pipe fitment is not always perfect. Sometimes they are too large and leak, other times they are very tight and do not allow the inner pipe to come out, both have proven to be an issue. Another issue is with the glue itself, over time with heat cycles the glue will no longer hold and the pipes will eject from the cast piece.

Now, this does not sound catastrophic does it? Just a little coolant leak, right? Well, imagine you are on track (or the street for that matter) and one of these coolant lines desides it doesn't want to stay put. What happens is the coolant system becomes very empty, very fast. This causes a massive smoke cloud behind the car and a lot of coolant on the track/street. This can be a problem for both you and the person driving behind you. Typically the person behind you takes the brunt of the hit and ends up spinning out. Now, there area couple of different solutions to this issue, both involve engine removal. One solution to this issue is referred to as 'pinning' the coolant pipes. What this means is that a hole is drilled through the cast pipe, as well as the insert, and then the hole is tapped (this creates threads for a bolt) and a bolt is installed with loctite. This is a low cost and effective solution, however, this is not permanent in our eyes. Over time the loctite will fail and there will eventually be a leak. Pinning has been inspected after 50k miles and there have been no issues. This is certainly not the 'wrong' way of doing it, but given that these cars are not going anywhere, we believe a weld is the permanent solution. All of that being said, welding does come with it's own issues. We have seen failures with welding as well, the issue stems

from the quality of the welds. If there are any mistakes or issues with the welds they will not hold and will cause a coolant leak, the welds here have to be perfect. Our welder is FAA certified and welds aerospace parts every day, we have yet to have a single issue with any welds on the many sets of coolant pipes we have done. These welds/pipes have been tested and thoroughly exposed to severe track conditions with no issues what so ever. We are confident in this repair and stand behind it. If you have a Mezger powered 911 feel free to give us a call and we can go over any questions you may have. This is an essential repair for these vehicles, especially as they get older. We typically recommend doing this job with a clutch so the customer can take advantage of the labor. The pictures below were taken of a set of coolant pipes from a 997 GT3. 

By Chris McNeal June 22, 2026
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By Chris McNeal May 29, 2026
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By Chris McNeal April 8, 2026
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performance tuning and diagnostics in Arvada, CO
By Chris McNeal April 8, 2026
Your Audi hesitates at the merge point. Your BMW's check engine light stays on after two inconclusive shop visits. Your Volkswagen GTI has gradually lost the sharpness it had when it was new. These experiences are frustrating, and they almost always trace back to something specific. ​ Performance tuning and diagnostics improve German car performance by locating system-level inefficiencies and recalibrating engine and transmission control software to restore or improve power delivery, throttle response, and long-term drivability. ​ Modern German vehicles operate through interconnected networks of sensors, modules, and software that manage everything from fuel injection timing to suspension adjustments. One miscalibrated parameter or undetected fault anywhere in that network shows up as a performance problem you can feel but may not be able to name. ​ Black Canyon Performance European Auto Service has been working on Audi, BMW, Mercedes-Benz, MINI, Porsche, Volkswagen, and Land Rover vehicles since 2016. Diagnostics and tuning are central to what we do, and performance tuning and diagnostics work best when combined into a single process. Here's what each service actually involves.
By Chris McNeal March 27, 2022
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By Chris McNeal March 25, 2022
Routine inspections, repairs and component replacements are an essential part of car maintenance. To keep your luxury ride running in tip-top shape, bring your Audi to the right auto shop. Here’s how to choose which one is the best option for you. Certifications When you look for a repair center, start with its credentials. Does it have certifications that prove the crew has trained and seasoned mechanics who know their way around an Audi? Consider their background, too. You wouldn’t want just anyone handling your car. It needs to be an old hand with Audi repairs for better results. Reliability Can you trust the repair shop? With plenty of dodgy repair centers out there, it’s smart not to take any chances. Before you leave your Audi at any repair facility, learn more about the shop and its crew. What kind of reputation does it have in the market? What do the reviews say about the shop and its team? Communication Does the repair center answer your calls, messages, or emails promptly? Is the staff informative, providing the details you need to consider which maintenance services that your car needs? Do you find it easy to ask questions or are you intimidated? Does the staff dismiss any of your concerns or do they take the time to go over every issue and put your worries to rest? Cost How much will it set you back for? Are there any hidden charges? Trustworthy repair centers are transparent with their prices. They don’t tack on a ton of bills on top of your total, so you don’t get a nasty surprise when you finally look at how much you’ll need to pay for everything. Plans Some car repair shops, though, offer a range of financial plans to make it easier for customers to pay. If the bill is huge, you can look over those financial plans to see which option works best for you. That way, you won’t have to pay the bill in one go. Knowledge Ask them how the process will go. An experienced mechanic won’t have any problem walking you through what’s going to happen. If they can’t explain the process, though, that’s a red flag. If you think they aren’t at all convincing in the way they seem to justify this repair or that one, those are possible signs that you’re dealing with a dodgy service provider. Bring your Audi elsewhere.
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