beater

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

HMT-Admin

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

beater

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)


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

Thanks for the info man.

beater

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

Thanks
Nick

HMT-Admin

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



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

beater

Thanks alot man.

sean88accord

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 ?

hulkhb

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

quadnie

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

HMT-Admin

Jesus christ, schedual 40... you want the ****** 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