Re: Advice on Studs for Exhaust Manifold ? 4 Questions . . . - Saab 9-5 Bulletin Board - Saabnet.com
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Re: Advice on Studs for Exhaust Manifold ? 4 Questions . . .
Posted by Stephen Goldberger [Email] (more from Stephen Goldberger) on Thu, 12 Jul 2018 12:12:25
In Reply to: Re: Advice on Studs for Exhaust Manifold ? 4 Questions . . ., Doug W [Profile/Gallery]
, Thu, 12 Jul 2018 09:40:56
Without any experience with broken exhaust studs, but speaking generally
The long spacers between the exhaust manifold and the bolts are designed to allow the studs to accommodate the (lateral) differential thermal expansion between the (sometimes) red hot manifold and the water cooled head. it also allows the stud to accommodate the manifold expansion without stressing the (screwed into the water cooled heads) studs beyond their elastic limit. Fatigue shouldn't be too much of an issue as the stress never reverses.
Mechanical design is probably more important than material selection here
posted by 98.28.165...
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