Exhaust Mani Tubing Thickness
 

So I am getting ready to fabricate my own exhaust mani. I ordered a couple of mandrel j-bends. They came and they are paper thin. The guy at Jegs told me that they were 16ga, but I mic'd them an they are 18 gauge. My question is, what gauge do would you recomend to construct this bad boy. 18 is ridiculous and I think 16 might be a little thin. Any help will be much appriciated.

Thanks
Nick

Re:Exhaust Mani Tubing Thickness
 

http://www.mcmaster.com/library/1/10...45735K215L.GIF

We use Schedule 10 on all of our manifolds, its pretty thick ----, but has never cracked/broke on us. They are nice 90 degree bends to work with, and the price is great. 4.20 a piece, get like 8 of them and you can make yourself a pretty sweet manifold.

Jeff

Re:Exhaust Mani Tubing Thickness
 

I didnt even think of them. I have an account with them. That is very reasonable for stainless.

I am going to fabricate a manifold like this: (pic compliments of shitbird)
http://www.zcbrothers.com/honda/mani.jpg

I think I can get away with 4 90's with 2 short straigh pieces.

Thanks for the info man.

Re:Exhaust Mani Tubing Thickness
 

While on the topic, for the downpipe, what do you recomend?

Thanks
Nick

Re:Exhaust Mani Tubing Thickness
 

16 gauge is fine.. Mandrel U bends from Jcwhitney work great.

http://www.jcwhitney.com/wcsstore/jc...3351f2752ed8ad

(A/B)=18", (C)=6", ID=2 -7/8", OD=3" or 2 1/2"

Re:Exhaust Mani Tubing Thickness
 

Thanks alot man.

Re:Exhaust Mani Tubing Thickness
 

0.065 316L works awesome. 60,000 miles on my turbo manifold no cracks. Also using the right welding rods for joing the flange to the tubing helps. Use silicone bronze stianless rods for that. And use 316L rod for the tubes if possiable. Its low carbon status helkps with carbon crepping and also helps aviod cracks. If you head over to the burns stianless website the have ammassed awesome info on materials selection,
'

Of course inconel is the best but my god who can afford it ferrari ?

Re:Exhaust Mani Tubing Thickness
 

I use the Mcmaster 90's also but in 8 gauge, aka schedule 40. best ---- on the market.

Re:Exhaust Mani Tubing Thickness
 

I mostly see schedule 40 on TT v8 all custom setups. 16ga should be fine for DP. Can you take that 18ga back?

Re:Exhaust Mani Tubing Thickness
 

Jesus christ, schedual 40... you want the fucker bomb proof or something? scheudal 10 is pretty ------- hard to cut as it is. Not to mention you dont want the manifold to way 100lbs. :P

Re:Exhaust Mani Tubing Thickness
 

I agree with you jeff.. they usually make them way too heavy. But when your ride already weighs 4000 pounds, who cares?

If I were to do a custom setup on a honda, I would most likely follow your lead.

But as I said, I've seen quite a few v8 setups with schedule 40.

Re:Exhaust Mani Tubing Thickness
 

Yeah, I can send it back. I bought it from JEG's. I think I am going to keep it to practice on since it was cheap enought. They were $12 a piece and it would cost me ~$10 to ship it back so I am just going to keep it.

I think I am going to go with the McMasters fittings as they are very resonalbly priced. Thanks to all for all of the tips.

-Nick

Re:Exhaust Mani Tubing Thickness
 

LoveFab makes there mani's from the tubing you can buy from Kteller.com. We have used some of the Ktell tubing for WG dumps and ----.. I just ordered a bunch or U's from ubendman on ebay..i figured what the hell, and those are thicker than the kteller, maybe u wana shoot him an email. His tubing is what my next mani will be made of.

pat

Re:Exhaust Mani Tubing Thickness
 

Dude, if they sent you the wrong ------- part, then tell them ----------ers to send u the right one, as in you will either get a discount or they will return ship it for free.. not your fault they fucked up. Dispute the charges with your credit card.. ---- them!

If you want to practive, pick up some scrap exhausts at a muffler shop for free.

Re:Exhaust Mani Tubing Thickness
 

Thats what all the other fab. companys use also, Lovafab, Full-race, Spoolin performance, ......... If you look at the thickness on there site its not even a 1/16" thicker, why not have the added insurance, esp. when you have a garuntee for life on stuff that i make. :P

Re:Exhaust Mani Tubing Thickness
 

i used schedual 40 on for my manifold (it looks exactly like beater's)
its heavy as hell, and yes, its ------- bomb proof.
oh, and yea, its a mother fucker to cut.

Re:Exhaust Mani Tubing Thickness
 

So my McMaster elbows came today. I think they are going to fit the bill nicely. They appear to be cast, can anyone confirm this?

As for the JEG's mandrell, They are going to be put to good use making a super duper top secret intake mani. More details on that later...

-Nick

Re:Exhaust Mani Tubing Thickness
 

there not cast, there forged

Re:Exhaust Mani Tubing Thickness
 

I think you would have a pretty difficult time welding cast. Nickel rods are expensive and it takes some skill as a welder to do that kinda work. :o

Re:Exhaust Mani Tubing Thickness
 

i weld mild steel to cast all the time with l-50 .035 wire and gas. it has not failed me yet ;D just turn up the heat and keep it on the cast most of the time ;)

Re:Exhaust Mani Tubing Thickness
 

if you get over shcedule 10 thickness the heat exspansion from the stianless will inevitably crack the tubbing. Also run the thinest tubbing you can like i siad we use 0.065 and its bomb proof. just make support brackets to keep the wieght of turbo off. weve got plenty of turbo manifolds weve tested none with cracks built as i described above.

Re:Exhaust Mani Tubing Thickness
 

well this post has made me signed up for welding class again! w00t to 20 dollar lab fee for all the welding my little heart can handle :P mig, tig, oxy, arc, chop saw, plasma cutter ;D

Re:Exhaust Mani Tubing Thickness
 

I will try to post some pictures of both, but, if you hold them up side by side (sch 10 and sch 40) I can't realy see the difference. Sounds like a big difference and the weight is about the same.

Re:Exhaust Mani Tubing Thickness
 

http://www.zcbrothers.com/honda/6.23.01-2.jpg

It's not that thick. I was not able to find and 1/2 stainless plate locally, damn steel shortages, so I am going to use mild steel. This is going to be one ugly manifold. Ah well, might just get the whole thing coated or slap some heat wrap on it to cover up its uglyness.

-Nick