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Old 03-24-2009, 06:56 PM   #1
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Exhaust leak weird spot

Hi i have recenly gotten an exhaust leak on my 94 Vx
its on a flexable pipe located on the down pipe rite before the cat
i tried to bondo over the mesh but only lasted a few days any ideas on how i can stop the leak

Thanks
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Old 03-25-2009, 03:11 AM   #2
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I suspect that the heat there is too high for even a "muffler bandage" repair kit you'd get at an auto parts store, let alone bondo. You probably need to replace that pipe.
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Old 03-25-2009, 05:18 AM   #3
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I suspect that the heat there is too high for even a "muffler bandage" repair kit you'd get at an auto parts store, let alone bondo. You probably need to replace that pipe.
It's not the heat it's because the pipe is designed to flex with engine movement. Hence the name "flex pipe". I also had that problem on my monthe-in-laws Accent. It was replaced for free by the dealer as part of the emissions warranty.
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Old 03-25-2009, 05:26 AM   #4
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yea they go out, i had to replace the one on my dads van. took freakin forever cuz of the rust!
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Old 03-25-2009, 02:45 PM   #5
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size of exhaust

Ok so it looks like im replacing the entire tube
can i replace with straight pipe or does it have to be flex

also what is the size of a stock vx exhaust
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Old 03-25-2009, 05:15 PM   #6
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You must have a slip/flex joint so the engine can rock a little when you speed up/slow down.
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Old 03-25-2009, 05:38 PM   #7
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Out of curiosity is thermal expansion large enough to be one reason for flex joints?
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Old 03-26-2009, 08:00 AM   #8
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The OEM VX exhaust doesn't have a traditional flex section, much less before the Cat....I don't believe that you have a stock exhaust on your VX.
#11 in that picture is the stock VX downpipe coming from the Maniverter.

The stock system has spring loaded bolts and rounded graphite gasket on the downpipe from the exhaust manifold that attach it to the B-pipe and the rest of the system to tack up any rocking motion.

IIRC, the stock diameter of the OEM system is either 1.65" or 1.75"
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Old 03-30-2009, 08:58 PM   #9
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Out of curiosity is thermal expansion large enough to be one reason for flex joints?
no, it's for engine vibrations as well as drivetrain flex (motor/transmission mounts. yes they're supposed to move.)
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Old 03-31-2009, 03:10 AM   #10
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no, it's for engine vibrations as well as drivetrain flex (motor/transmission mounts. yes they're supposed to move.)
Thanks. My backup mechanic (when my main guy's on vacation) mentioned thermal expansion as well once when I was having a flex section replaced, but I was skeptical that the lengths & temps involved would really make it much of an effect.
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