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Old 02-28-2009, 06:56 PM   #1
roshkaboo
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Default exhaust pipe wall thickness

so i came to the conclusion that i am going to have to build my own pipes. the style i want doesn't seem to be available or just not long enough for my hardtail stretch. i am going to use stainless steel. but here is the question. i have a choice of .035 or .065 wall thickness. i like the idea of thinner lighter material, but would that cause a problem for bending? or is the thicker stuff better. thanks in advance.
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Old 02-28-2009, 07:20 PM   #2
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Default Re: exhaust pipe wall thickness

I'm no expert, but I would say it depends on the way the tubing is being bent. If mandrel bending, wall thickness shouldn't make a difference. A tubing bender or especialy a pipe bender (which I would not suggest) the thicker the better. It will hold its shape better w/ thicker wall.
Hope that helps a little.
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Old 02-28-2009, 07:25 PM   #3
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Default Re: exhaust pipe wall thickness

'm building SS headers using 18g(.049") for a trump, that's min. thickness I reckon.
This link might be helpful too.
http://www.burnsstainless.com/304tubing/304tubing.html
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Old 02-28-2009, 07:57 PM   #4
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Default Re: exhaust pipe wall thickness

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Old 02-28-2009, 09:24 PM   #5
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Default Re: exhaust pipe wall thickness

thanks for the info. i am gonna try out the thinner stuff, it looks like the pipes i have on there now are real thin and very light. i am going to mandrel bend them and i'm hoping i can get away with just bending the pipes in one shot with no cutting/welding.
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Old 02-28-2009, 09:51 PM   #6
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Default Re: exhaust pipe wall thickness

Post some pics when your done.
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Old 02-28-2009, 10:37 PM   #7
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Default Re: exhaust pipe wall thickness

I will do. They are going on my 61 trump. Gonna be a little like drag pipes but go all the way to the rear tire and angle up with cocktail shakers
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Old 03-01-2009, 12:55 AM   #8
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Default Re: exhaust pipe wall thickness

get u bends and straight pieces and weld together. go for the thicker...good luck
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Old 03-01-2009, 01:56 AM   #9
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Default Re: exhaust pipe wall thickness

http://unit1parts.myshopify.com/prod...f-exhaust-kits
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Old 03-01-2009, 02:09 AM   #10
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Default Re: exhaust pipe wall thickness

wrinkling can occur if the wall thickness is too thin. or the pipe can distort.
Especially If Your Radius is too tight. (anything under .040 you will need a miracle).
If You have access to a mandrel bender, then go for it.
I just ordered a set of pre bent sections earlier today from Four Aces cycle
(Biltwell kit), for some drag pipes I'm going to fab up.
finding prefab mandrel bends in Stainless may not be as easy.
take your time, seamless stainless tubing isnt cheap.
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Old 03-01-2009, 03:55 AM   #11
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Default Re: exhaust pipe wall thickness

Quote:
Originally Posted by roshkaboo View Post
so i came to the conclusion that i am going to have to build my own pipes. the style i want doesn't seem to be available or just not long enough for my hardtail stretch. i am going to use stainless steel. but here is the question. i have a choice of .035 or .065 wall thickness. i like the idea of thinner lighter material, but would that cause a problem for bending? or is the thicker stuff better. thanks in advance.
I don't think anyone's mentioned this yet, but the thinner wall pipes will give you a meaner sounding exhaust note.
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Old 03-01-2009, 07:02 AM   #12
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Default Re: exhaust pipe wall thickness

Bending typical mild steel exhaust tubing on a cheapo hydraulic bender is impossible - I had a lot of goes at that - cold - heated - just ripples! As you say a mandrel bender is what the pros use.. Use the thin stuff - or consult a muffler shop - I bet you don't have the bender? I'm guessing you are getting a contact or friend to lend the machine? Just if you are, the operator will know the best thickness tube to use ..
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Old 03-01-2009, 10:20 AM   #13
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Default Re: exhaust pipe wall thickness

this is all great info guys. I didn't know the thinner the pipe wall the meaner the sound. That's kinda what I'm going for with straight through shakers. I personally don't own a mandrel bender $$$$ but a buddy I used to work with has built countless stainless headers for hotrods. He's Gonna give me a hand with these pipes. I will try the thinner stuff first. If that doesn't bend cleanly I will have to start over with either the thicker wall or use a biltwell kit. if these come out like what my vision, they will give this bike so much character. I will def post pics
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Old 03-01-2009, 10:46 AM   #14
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Default Re: exhaust pipe wall thickness

http://www.stainlessworks.net/cart/i...6435ff0782505c
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Old 03-01-2009, 12:07 PM   #15
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Default Re: exhaust pipe wall thickness

^^^
over $400 for the mild steel kit? I thought We were in a recession
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Old 03-01-2009, 07:42 PM   #16
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Default Re: exhaust pipe wall thickness

Mandrel bent mild steel muffler tubing. BBQ black @ W-M $3.49. Total: $19 49
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Old 03-01-2009, 08:28 PM   #17
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Default Re: exhaust pipe wall thickness

On here the 2 into1 made from stainless...
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