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Registered
Join Date: Jul 2002
Location: Central California
Posts: 10
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Exhaust Manifold studs vs bolts
I finally couldn't take the rattles and removed the exhaust manifold off my 951 and ripped off the 2 remaining heat-shields. I sent it off to Jet-Hot and should get it back this next week. I'm replacing all of the gaskets and hardware as well, but I'm not sure why I would put the studs back in. Any drawbacks to using some high quality bolts?
-Matt '93 Rx-7 '87 951 |
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10-19-2002, 02:08 PM
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Registered
Join Date: Feb 2000
Location: Kingsport, TN
Posts: 2,935
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With a stud, you are supposed to use a locking nut so it won't loosen. You can't do this with a bolt.
If a bolt loosens, then all the load goes to another bolt. Several years ago I lost a locking nut on my 1-4 header. The remaining stud broke off at #4 right at firewall. It took me two weekends to cut the stud out of the head. I also had to limp home from Road Atlanta with a big exhaust leak near the fuel lines in hot weather. The old header did not have an expansion joint so there was a larger load on the studs. But if one loosens, the load on its partner has to go up. |
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10-20-2002, 06:53 AM
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Registered
Join Date: Feb 2000
Location: Kingsport, TN
Posts: 2,935
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Another reason for studs is that you can apply torque more accurately. And, furthermore, you don't wear out threads in aluminum engines in something that has to be removed occasionally.
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11-16-2002, 07:48 AM
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Join Date: Jul 2000
Posts: 5,745
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It seems to me that the stretch or deformation of the threads for same torque is less with a sud since you have 2 sets of threads.
drew1 |
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12-02-2002, 05:12 PM
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