we're in the middle of making a turbo manifold for my car and just wanted to see what you guy's thought of this....
I know most everyone uses Schedule 40 piping, which is preferred... But I have a local shop that sells .090" thick roll cage tubing. I've got a mandrel bender and it will bend up to 1 5/8 tubing and wanted to know if you guy's thought:

-a wall of .090" would be thick enough to take the high heat of high boost race pass's

-also, what size diamater tubing do you guy's run? I think 1 5/8" would be enough for a slightly ported B18C(GSR) head.. (ie. the piping should be large enough to accomidate the large port exhaust volume.)

As alwayse, thanks guy's for the help. Figure'd I'd ask here first since I know there's gotten to be alot of DIY Mani making

 

Chances that .090W will hold up are pretty decent... I would brace the manifold just for some extra assurance.

Another thing you need to consider is how tight your radius is on your mandrel bender, and then look at the bend radius on the plumbing bends.

 

yeah def brace it. but whatever tho, if it sucks, at least you tried.

 

woow i think that's the nicest thing i have ever seen hotrex say.

 

i braced this pig just because

finished her tonight for a buddy.

 

so again... even you josh, what size diamater piping do you guy's use for all your manifolds?

 

schedule 10 1.5 inch weld els

 

just fyi, gravity pulls down, not foward

THIS is a brace:

 

i made mine out of 16g 1.75" tubing with NO braces. i just added some gussets. no cracks and i don't expect any. much easier to work with and quicker to build. no straight pipe required if the u bends you get have legs on them, which most do. a lot less prep work and much fewer welds.