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Author Topic: Exhaust header studs/nuts  (Read 611 times)

Arizoni

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Re: Exhaust header studs/nuts
« Reply #15 on: April 10, 2014, 09:47:57 PM »
If you use a silicone RTV, be sure it says it is compatible with aluminum.

The more common RTV's like the ones used for bathroom fixtures, tile, etc. give off acetic acid while they are curing.
If this is trapped in a aluminum hole, the acid will attack the aluminum. 
RTV's of this type give off a vinegar smell.

Some of the high temperature RTV's sold at many auto supply stores are aluminum safe and should stand a better chance of surviving in that location.
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ace.cafe

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Re: Exhaust header studs/nuts
« Reply #16 on: April 10, 2014, 11:51:25 PM »
If you use a silicone RTV, be sure it says it is compatible with aluminum.

The more common RTV's like the ones used for bathroom fixtures, tile, etc. give off acetic acid while they are curing.
If this is trapped in a aluminum hole, the acid will attack the aluminum. 
RTV's of this type give off a vinegar smell.

Some of the high temperature RTV's sold at many auto supply stores are aluminum safe and should stand a better chance of surviving in that location.

I would just put it on the nuts where they go on the studs. I see no need to put it into the casting holes.
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suitcasejefferson

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Re: Exhaust header studs/nuts
« Reply #17 on: April 11, 2014, 12:05:16 AM »
I would just put it on the nuts where they go on the studs. I see no need to put it into the casting holes.

The problem is, even if you welded the nuts to the studs, the studs would still come loose. I need a way to prevent the studs from unscrewing themselves because of the vibration. The studs/nuts could just be replaced with safety wired bolts, but I'm afraid that might put to much stress on the aluminum threads. There is really nothing different here than any other bike, it's just I never saw studs that could be unscrewed by hand before. Most of them are stuck in the head really good.
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ace.cafe

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Re: Exhaust header studs/nuts
« Reply #18 on: April 11, 2014, 01:01:16 AM »
The problem is, even if you welded the nuts to the studs, the studs would still come loose. I need a way to prevent the studs from unscrewing themselves because of the vibration. The studs/nuts could just be replaced with safety wired bolts, but I'm afraid that might put to much stress on the aluminum threads. There is really nothing different here than any other bike, it's just I never saw studs that could be unscrewed by hand before. Most of them are stuck in the head really good.
Ok. For that,  you could use the aluminum compatible silicone, or a thread locking compound.
That part of the head does not get as hot as one may think. It's probably under 300 degrees max.
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barenekd

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Re: Exhaust header studs/nuts
« Reply #19 on: April 11, 2014, 07:44:48 PM »
Quote
I've used these on my 3 shovelhead engines since long ago. Solves all exhaust stud problems (& shovels only have ONE stud):

Nice setup, however do they come in alternate threads?
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