Originally Posted By: Miller88
Originally Posted By: 440Magnum
Originally Posted By: Miller88
Another thing that concerns me is the exhaust manifold is part of the head?! That's going to be a problem considering exhaust manifolds last a few years maximum. If the turbo is in the manifold ... eek!
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Since WHEN is an exhaust manifold expected to be short-life item, either cast in or not cast in the head? Every car in my .sig has its original exhaust manifolds. Even my daughter's 99 Jeep which has the thin-wall tubular steel 'header' type manifold used on the 4.0 for a long time. I don't think I've ever had to replace an exhaust manifold in 30 years of driving, and only a few exhaust manifold gaskets.
The turbo is never "in" the manifold. Its bolted to the collector outlet, or a short piece of piping- but that causes thermal losses so most OEMs put it as close to the exhaust manifold as possible.
I remember a lot of Ford trucks with bad exhaust manifolds, a few of the dodge trucks too.
It can certainly happen... but its pretty darn rare in the grand scheme of things. Certainly not something I'd ever worry about unless I were looking at a model with a documented history of being prone to exhaust manifold problems. And IMO, casting the manifold into the head pretty much eliminates the problem. ;-) Yes, the head now has to be cooled adequately, but its been done a lot in recent years, and not just on the Pentastar v6. No big issue.