10-06-2016, 03:00 PM | #45 |
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In general, titanium is notoriously tricky to weld (though this varies by the actual alloy used) and is susceptible to air contamination during welding. Improper welding temperatures and failure to shield with argon gas can cause the weld to be brittle -- and crack!
I lived through the pre-carbon fiber titanium cycling days and remember horror stories about the cheap Chinese and Russian titanium frames catastrophically failing at the welds due to poor prep and technique. |
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10-06-2016, 03:04 PM | #46 | |
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10-06-2016, 03:29 PM | #47 |
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Just to be clear, the entire rear section including the all pipes WELDED to the rear muffler are made of titanium.
It is the mid section that is CLAMPED between the rear section and the secondary cats that is made of stainless steel.
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10-19-2016, 10:29 PM | #48 |
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This is a helpful thread. Sorry to hear about the crack.
So in regards to buying MPE second hand. If you buy an MPE second hand, and you have the original receipt then will BMW warranty it? Even if you were not the original owner? If this is true, then you will want an MPE with a receipt of warranty!
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10-20-2016, 03:51 AM | #49 | |
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10-20-2016, 11:43 AM | #50 |
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This seems like it's an issue with the manufacturing process or part itself as others have stated. My question is what happens if the same cracks develop on the replaced part? And is it just going to occur again and again? As an engineer, it seems like this could be fatigue fracture due to thermal stresses.
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10-23-2016, 11:46 AM | #52 |
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Happened to mine too. BMW refused to warranty it, said I had backed into something. I told them, look at the tips, does it look like they have been hit? There would be marks if I had backed into anything.... So pissed.
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10-23-2016, 12:24 PM | #53 | |
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10-23-2016, 02:20 PM | #55 |
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Traded the car in with exhaust and all two months ago...
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10-23-2016, 03:25 PM | #56 |
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It could also very well be an indication of a design issue, where there could be a stress concentration at the weld location.
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10-24-2016, 12:04 PM | #57 | |
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10-30-2016, 04:42 PM | #58 |
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I have unfortunately found the same problem on my car. Taking it in tomorrow morning, at 23 months since it was purchased and installed at the dealership I bought the car at.
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10-31-2016, 11:38 AM | #59 |
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John I need to just come up with a reason for you to bring her back in so we can have Pete (the tech/fabricator we had on your car while she was in) patch it up for you. Speaking of... you have PM
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11-02-2016, 10:16 AM | #60 |
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After a brief inspection no cracks were found as of yesterday. Exhaust is at least 1.5 years old. The sides of the can are quite thin and i think that adds to the odd resonance/vibrating sound it makes
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11-08-2016, 06:10 PM | #62 |
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I am very interested to hear more about the cracking issue. I am in the market for the same exhaust. No one has posted anything in the forum about cracking issue or at least I have not encountered any post concerning this issue.
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11-08-2016, 06:57 PM | #64 |
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