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Old 07-15-2007, 08:11 AM   #1
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Default Now its the rear manifold

Well, had the front manifold replaced about two months ago due to a crack in it, and now the rear has a small crack in it. Am I the only one experiencing this problem???
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Old 07-15-2007, 09:34 AM   #2
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Default Re: Now its the rear manifold

Quote:
Originally Posted by auroralover
Well, had the front manifold replaced about two months ago due to a crack in it, and now the rear has a small crack in it. Am I the only one experiencing this problem???
Ok gearheads, is this an argument for the solid motor mount mod?
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Old 07-15-2007, 12:05 PM   #3
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I don't recall very many reports of exhaust manifold failures on the series II. The series I, yes - but those are also getting a bit up there in age. Has there been any other issues with the car? Overheating, fueling issues, etc.?

I suppose an argument could be made that perhaps the solid mount may have saved the rear manifold (although I'd expect the manifold to down pipe gasket to go first) but don't think it would affect the front one.
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Old 07-15-2007, 12:23 PM   #4
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I believe you are the first S2 person I have heard of cracking these manifolds. Good news is as long as you are swapping, it should be easy to find them.

Karl..I can't see an argument for solid mount in this case. The manifold is bolted securely to the motor and a front mount should not affect a front manifold. I would look more to driving fast through cold puddles and the cold water cracking the manifold.
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Old 07-15-2007, 01:14 PM   #5
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That'* why I was asking... I just figured the exhaust is all connected and the manifolds are bolted to the motor so they're not gonna flex, but Archon is probably right, the down pipe gasket would probably take the hit first.

Just a thought.
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Old 07-15-2007, 02:39 PM   #6
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No other issues at all, car has been performing great. As a side note, my mechanic said he has seen quite a few of these lately, but all have been on Impalas
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Old 07-15-2007, 03:56 PM   #7
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Quote:
Originally Posted by Archon
Has there been any other issues with the car? Overheating, fueling issues, etc.?
What kind of fueling problems could a cracked manifold cause. Not trying to be a smartass or anything but I have a post up about chronic richness.
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Old 07-15-2007, 05:11 PM   #8
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An overly lean condition will run the motor much hotter, those hotter exhaust gases heat the manifolds and in turn..heat them beyond acceptable tolerances..that can crack a manifold. Good question..I'm sure many were wondering the answer.
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Old 07-16-2007, 07:07 AM   #9
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Quote:
Originally Posted by BillBoost37
An overly lean condition will run the motor much hotter, those hotter exhaust gases heat the manifolds and in turn..heat them beyond acceptable tolerances..that can crack a manifold. Good question..I'm sure many were wondering the answer.

You should see it on the plugs then.
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Old 07-19-2007, 01:07 PM   #10
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would that heat do the same to a cast front EM or more likely to a steel one
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