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In a message dated 3/13/2011 6:56:23 P.M. Eastern Daylight Time,
fluffysheap@gmail.com writes:
On
my home spun exhaust for my 3-rotor, I tighten the exhaust studs for the
center rotor, but only snug down the bolts for #1 and #3 in order to allow the
exhaust manifold to grow and shrink as necessary. With 1600-1700* EGT's,
it seems obvious that the manifold will grow more than the engine and if not
allowed to move, it will crack. By torquing them only enough to prevent
leakage, they are allowed to grow as needed, preventing cracks. So far,
no broken studs or cracked exhaust manifold on my 3-rotor.
Mark S.
Bingo.
How about you torque up the center most stud to auto spec, then use 2 bevel
washers flange to flange pulled down just short of flat on all other
studs.
Then use a short stack of bevel washers above and below a flange on the
turbo setup to a strut to support the weight and keep the strain off of the
manifold.
Lynn E. Hanover
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