for manifolds... what are the pros/cons on both? what do you prefer? i know piping is thicker (usually) but tubing is cheaper/easier to work on i hear.

im a new welder and i'd like to know what kind of material i should buy to start with. help me out

 

i just made a topmount manifold out of header tubing, 16g...i got it ceramic coated. it lasted about 4 hours before cracking. i made a heim joint to help the manifold itself support the turbo, but i didnt make a heim joint or any kind of bracing for the wastegate. it was a hks gt2 wastegate, i would agree with anyone that says its the heaviest wastegate out there. i think it would have "lasted" longer if i were to also brace the wastegate.

i guess what im saying is making it out of tubing is "doable" but not a good idea for longetivity, but yes its a lot cheaper.

everyone seems to use sched 10 with no problems

 

The difference is how it is measure...piping is measured by ID, tubing is measure by OD. And piping is usually a nominal size, not actual.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by k24em2 &raquo;</TD></TR><TR><TD CLASS="quote">The difference is how it is measure...piping is measured by ID, tubing is measure by OD. And piping is usually a nominal size, not actual.</TD></TR></TABLE>

oops, i thought he was looking for an opinion on whether he should use tubing or piping for a manifold.

i kinda figured he would know about the ID for pipe and OD for tube

 

Pipe is actually cheaper in most cases I find. Making a turbo exhaust manifold from cold formed mandrel u bends would be a poor choice in my opinion. Hot formed sanitary fittings would be a step in the right direction.

At my shop though we only use sch40, yeah its heavier but big whoop, at least I can guarantee it will never fail, kind of a big deal when your manifolds are competing in major races/events.

Even on a street car, dealing with cracking is gay. If the manifold weighs 10lbs more big deal, there are other places you can shave 10 lbs where reliability will not be sacrificed.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by redboost10 &raquo;</TD></TR><TR><TD CLASS="quote">

oops, i thought he was looking for an opinion on whether he should use tubing or piping for a manifold.

i kinda figured he would know about the ID for pipe and OD for tube</TD></TR></TABLE>

i'm glad it was said. that was news to me.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dave@passenger &raquo;</TD></TR><TR><TD CLASS="quote">Pipe is actually cheaper in most cases I find. Making a turbo exhaust manifold from cold formed mandrel u bends would be a poor choice in my opinion. Hot formed sanitary fittings would be a step in the right direction.

At my shop though we only use sch40, yeah its heavier but big whoop, at least I can guarantee it will never fail, kind of a big deal when your manifolds are competing in major races/events.

Even on a street car, dealing with cracking is gay. If the manifold weighs 10lbs more big deal, there are other places you can shave 10 lbs where reliability will not be sacrificed. </TD></TR></TABLE>

the only reason i used stainless tubing instead of pipe was because it was laying around= free, so i thought its just my time. i really think it would have been ok if i would have braced the wastegate, with a heim joint of course, not just a piece of stalk.