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Re: Stainless sleeves?
Posted by Justin VanAbrahams (more from Justin VanAbrahams) on Wed, 30 May 2012 11:43:03
In Reply to: Stainless sleeves?, Cmyles , Wed, 30 May 2012 11:20:26
I have always wondered about this - virtually no other car in the universe has those sleeves/spacers on its exhaust manifold, and none of them have problems with loosening. I have to wonder if this wasn't Saab's tendency to over-engineer to avoid potential problems rather than something absolutely necessary. Turbos and 4v-per-cylinder heads and mixed alloy/iron engines were all still pretty mysterious in the early '80s. 30 years later, we can look at the decisions they made about the B202T and sometimes say, "Hey, that was some forward thinking!" and sometimes say, "WTF were they thinking?" :) I don't think those sleeves are necessary - my Ford 2.3t, Audi 1.8t, Volvo 2.4t, and GM 2.0t don't have them - but by the same token they certainly don't hurt.

I do think SS fasteners on the exhaust isn't a good idea. I tried that with my Ford 2.3t to address the constant issues with fasteners going through an iron manifold into an iron head, and they all got just as nasty as the factory bits, maybe worse. I think the correct answer is as Simon said. ~Grade 10 studs with plenty of high-temp anti-seize (I use Loctite Copper - there is better, but so far so good) and the correct brass self-locking nuts (eeuro has them). Sadly, the Ford 2.3t doesn't have room for studs (you'd nee to remove the engine to install/remove the manifold!) and I haven't found such a good solution when bolts (vs. studs) are called for.

There are a few expensive alloys out there that may work out (eg A286) and of course there is always titanium. I know several Japanese tuners recommend titanium exhaust hardware for boosted applications, but I have no firsthand experience. $10-$20/bolt is a little tough to swallow in the name of experimentation (to me, anyway). It's going to be a while before I pull the engine from the XR against, but when I do I know I will have to do something - bolts that won't come out really aren't much more fun than bolts that always come out. :)

posted by 12.195.130...
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