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/cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> What is the stock header made out of? /cgi-bin/YaBB.pl?num=1345940864 Message started by Cavi Mike on 08/25/12 at 17:27:43 |
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Title: What is the stock header made out of? Post by Cavi Mike on 08/25/12 at 17:27:43 Is it mild-steel or stainless? Not the stainless most of you have come to know and love that doesn't rust but what most stainless exhausts are made from, 400 series. It surface rusts but never rots. I would think that a bike exhaust is made from this, I have a hard time believing it would be mild steel but if it is, it completely changes what I'm going to do with my exhaust. |
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Title: Re: What is the stock header made out of? Post by Oldfeller on 08/25/12 at 20:46:10 In 1987, it likely was designed from simple low cost mild steel tubing that was polished and chromed (on the outer shell anyway). What the 2012 models were made of, who knows? |
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Title: Re: What is the stock header made out of? Post by tizzyfit on 08/29/12 at 17:07:44 Stick a magnet on it. If it sticks, it's not stainless steel. That being said, it could still be stainless steel but with less than 10.5% chromium, which kind of puts it in the "maybe" category. |
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Title: Re: What is the stock header made out of? Post by rfw2003 on 08/29/12 at 17:19:37 As bad as mine is rusted on the slip fit portion of it, I'm betting it's just mild steel. I will find out this weekend though when I go to weld the 10° adapter on, since I still can't get a good seal even with the stainless steel t-bolt clamp and slotting. R.F. |
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Title: Re: What is the stock header made out of? Post by Cavi Mike on 08/29/12 at 17:20:13 Magnets stick just fine to any stainless steel except for 300 series. Google "austenitic stainless" The "stainless" forks in your silverware drawer are magnetic, as are high-quality knife blades and will corrode given the opportunity. |
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Title: Re: What is the stock header made out of? Post by tizzyfit on 08/29/12 at 18:35:22 If it's 400 series, will the magnet stick to it or not? My understanding is it will not, your mileage may vary. |
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Title: Re: What is the stock header made out of? Post by rfw2003 on 08/29/12 at 18:43:56 tizzy I do believe 400 series SS is magnetic. |
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Title: Re: What is the stock header made out of? Post by Cavi Mike on 08/29/12 at 20:11:16 Yes, 400 is magnetic. Pick up any knife and stick a magnet to it, they're all 400 series. Companies will trademark some specific blend of certain metals for their knives but they still fall within the category of a martensitic stainless which is magnetic. Only austenitic steels are non-magnetic. |
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Title: Re: What is the stock header made out of? Post by justin_o_guy2 on 08/29/12 at 22:07:37 & yet, I find myself drawn to Austin. |
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Title: Re: What is the stock header made out of? Post by teabowl13 on 08/30/12 at 08:59:11 Hey Cavi... So I have to ask: What are you planning to do with your exhaust, and why does the kind of steel it's made from matter? |
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Title: Re: What is the stock header made out of? Post by Cavi Mike on 08/30/12 at 23:29:15 I have a section of 2.25" 304L pipe that slides right over the header like a glove. I was gonna weld it directly to the header but if I have to worry about the area I ground the chrome off rotting away, I'm not gonna do it. That means I need to figure out a way to make the pipe removable while still looking seamless. |
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Title: Re: What is the stock header made out of? Post by justin_o_guy2 on 08/31/12 at 04:16:55 I sectioned my header & removed the inner pipe years ago. The TIG weld hasnt been hard to keep from rusting at all..Ospho is gone, Jasco is the same stuff, 1/2 price. You hafta Look to even notice the header isnt stock, |
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Title: Re: What is the stock header made out of? Post by Cavi Mike on 08/31/12 at 04:21:06 I'm gonna be riding this all year round in the rust belt. I'm also terrible with maintenance and I'm using exhaust-wrap to hide the seam between the header and pipe. It's a combination that will make this rot out in couple years, three if I'm lucky. Not acceptable. |
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Title: Re: What is the stock header made out of? Post by teabowl13 on 08/31/12 at 18:18:29 If you are wrapping it anyway, why not paint the header? I just got a can of Rustoleum High Heat paint at the hardware store that's rated to 1500 degrees, requires NO special primer, and doesn't need to be baked on; just spray and go. I believe (And I may be remembering this wrong...) I read somewhere here that the header only gets up to about 600 degrees tops... 1500 degree paint should hold up pretty well, even with the heat sealed in by the wrap... I've also seen paint sold that's made for pipe wrap; maybe that would work to keep the moisture out... It's like an aluminum looking paint that you spray over the wrap. |
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Title: Re: What is the stock header made out of? Post by rfw2003 on 08/31/12 at 18:40:54 5A6B6F6C6179623F3D0E0 wrote:
Not quite true, if you getting it hot enough to blue it, your getting to atleast 900° as that is where chrome plating starts to turn blue. R.F. |
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Title: Re: What is the stock header made out of? Post by teabowl13 on 08/31/12 at 18:51:14 Thanks RFW! I've learned not to trust my memory as the years go on... Still, a 1500 degree paint might work, right? How hot do you suppose that header gets under the fiberglass? |
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Title: Re: What is the stock header made out of? Post by rfw2003 on 08/31/12 at 19:16:56 Yeah 1500° paint should work just fine. As for how hot the pipe itself gets with the wrap I'm not sure, Don't think I've even seen where anyone has tried to measure temps of the pipe itself once it's wrapped. I know lots have shown the lowered temps at the wrap itself but not of the pipe. I think the biggest issue with wrapping the pipe will be the moisture that is held in contact with the pipe. On un-coated or painted only headers they have been known to rust out very quickly with pipe wrap. I like the looks of a wrapped pipe myself over the traditional use of heat shields in key spots, but with the issue of the corrosion of the pipes I won't do it. Instead when I get a custom larger ID header made up I'll just have that ceramic coated. R.F. |
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Title: Re: What is the stock header made out of? Post by scubachef on 08/31/12 at 20:25:43 I cut and welded the stock pipe....at least in 97 it was mild steel. |
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Title: Re: What is the stock header made out of? Post by rfw2003 on 08/31/12 at 21:50:25 28382E393A38333E3D5B0 wrote:
Good to know I'm not gonna run into any surprises when I fire up the torch this weekend to weld the 10° adapter on. I had finally found some stainless steel t-bolt clamps locally and I still have a slight leak, so I'm just gonna bite the bullet and weld that sucker on there. 8-) |
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Title: Re: What is the stock header made out of? Post by ralfyguy on 09/01/12 at 18:36:32 2F3036312C2B1A2A1A22303C77450 wrote:
So you're just running it with the outer skin? |
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Title: Re: What is the stock header made out of? Post by teabowl13 on 09/01/12 at 19:09:42 2F3C313B243A28245D0 wrote:
So you're just running it with the outer skin?[/quote] I was wondering about that too... I'm sure you've posted about this somewhere, and I don't want to hijack the original thread, but can you post a link to a write-up if you did one? I'd love to see what you did... |
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Title: Re: What is the stock header made out of? Post by Gyrobob on 09/02/12 at 04:36:12 417074777A62792426150 wrote:
Some areas of the exhaust systems on the Rotax motors in my gyrocopters stay orange hot for minutes at a time during climbout. I tried maybe 8 or 10 different rattle can high-heat paints. None of them worked for more than a few hours except for Dupli-Color high heat. It stayed on for maybe 25 or 30 hours of flying time (several months) before needing a light sanding and respray on the areas that got the brightest during climbout. I don't remember the color code, but it is a dark gray,.. nearly black. |
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