I'm no expert on this subject by any stretch of the imagination, but is this
not one of the reasons that most exhaust hangers incorporate a flexible link
of some sort. be it a strap or a "doughnut" of sorts. The entire system
tends to rotate slightly with engine torque. Helps to decrease the stress
on the header/head junction. Also helps decrease noise transfer through the
body and/or frame. Just my 2 pence!
Tony Childs
72 Spitfire - FK38809U
----- Original Message -----
From: "Douglas Braun & Nadia Papakonstantinou" <dougnad@bellatlantic.net>
To: <Teller.John@orbital.com>; <spitfires@autox.team.net>
Sent: Thursday, July 06, 2000 11:16 AM
Subject: Re: Weld Breaks on SS Headers
>
> I wish I could find a decent flex-joint that I could add to
> my exhaust. Any leads, anyone? At one point, I had
> a foot-long section of that cheesy spiral-wound flexible pipe
> between the header and the main pipe, but it fell apart after
> a couple of years.
>
> If you look at the geometry of headers and how they attach to
> the engine, you will see that a rigid header+pipe setup
> can apply very high forces to the flanges, studs, etc...
>
> Doug Braun
> '72 Spit
>
> At 10:31 AM 7/6/00 -0400, Teller.John@orbital.com wrote:
>
>
>
> >My miserable 1985 Buick Somerset with a 2.5L 4 (completely unbalanced
mind you)
> >came from the factory with a welded together stainless steel manifold.
After
> >175K miles, it is doing just fine.
> >
> >The manifold is connected to the rest of the exhaust system through a
flexible
> >coupling consisting of a flange on the cat pipe and another on the
manifold with
> >a "doughnut" between them, all held together by two spring loaded bolts.
> >Perhaps the flexible coupling is what keeps the stiffer stainless from
breaking
> >its welds.
> >
> >Most of the vehicles in the Import Car Tuning magazines at the grocery
store use
> >a fancy flexible coupling between their SS headers and the rest of the
exhaust
> >system. Probably for that very reason!
> >
> >--- JST
>
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