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Q on SS bolts
I have a thing for stainless steel.
 I'm now doing some "while your'e in there" work on the car while changing syncros and dogs on my gearbox. e.g replacing engine mounts etc. I want to replace the bolts for the engine mounts, and also for the engine cross-bar. Is it ok to use SS bolts or is SS less suitable for this?
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Arnljot 1980 930 GT35R, TurboKraft IC, 965 P&C, 964 Cams, Tial WG, ported heads, BLWUR, RarlyL8 hdrs&mfflr, Zeitronix logger & wideband 1989 928GT 1972 BMW 3.0S |
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07-03-2006, 05:59 AM
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I love the look of stainless bolts also - but most stainless that is commercially available is very soft and NOT suitable for the uses you mention.
sorry. angela
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Hello http://forums.pelicanparts.com/off-topic-discussions/1102514-we-lost-amazing-woman-yesterday.html |
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07-03-2006, 06:15 AM
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There are at least a zillion different grades and alloys of stainless steel.
 Almost all of them are weaker than a high grade carbon steel until you start getting into very high temperature ratings. My advice? do it right, engineer your changes. All that means is determine the strength ratings of the existing bolts and also the ratings of the proposed bolts, then compare those to the load, temperature, and exposure. If you do all that correctly you will not have a problem at all. Basic strength charts are available depending on alloy and grade but calculating the load on the engine mounts and cross bar in not an easy thing to do. If this is strictly a cosmetic thing, I say leave it alone. |
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07-03-2006, 07:14 AM
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I would not use stainless steel bolts. They will gaul up and make you un-happy.
Dave |
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07-03-2006, 08:03 AM
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I am using stainless for non-critical fastening such as the engine tin ect. For more critical points such as the flywheel, motor mounts and cv joint I am replacing with original spec steel bolts.
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Mike '84 911 Carrera Coupe (totaled) '83 911 SC Coupe ‘06 Aston Martin Vantage V8 |
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07-03-2006, 08:13 AM
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Thanks folks. I get the picture. I'll stick with genuine bolts.
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Arnljot 1980 930 GT35R, TurboKraft IC, 965 P&C, 964 Cams, Tial WG, ported heads, BLWUR, RarlyL8 hdrs&mfflr, Zeitronix logger & wideband 1989 928GT 1972 BMW 3.0S |
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07-03-2006, 08:17 AM
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Galling of stainless bolts is more predominant in the 300 series, and sometimes the 400 series when exposed to long term high temperatures.
Even then, galling can be controlled and kept to a minimum with anti-sieze products or my favorite, milk of magnesia. That stuff is magic. |
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07-03-2006, 08:38 AM
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Simple answer is that stainless is awfully tough ( impossible?..outside the aerospace industry)...to find as a "graded" component..like Euro property class 8.8 or US-Grade 8.
- Wil
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Wil Ferch 85 Carrera ( gone, but not forgotten ) |
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07-03-2006, 12:48 PM
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Many fasteners on our car are not used for structural purposes. For those fasteners, SS is acceptable, but think first before replacing.
Sherwood |
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07-03-2006, 02:30 PM
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1984 Porsche 911 3.2L
