Stainless Steel of course.

Does everyone use schedule 10 here ?

How about schedule 5 ?

 

10

 

Why do most go with 10 instead of 5 ?

 

I dont know what schedule mine was, but its 3.5mm thick pipe.

 

a lot of people are using sch.10 to keep costs lower but their are several of us that use sch.40.

Dunno about sch.5 users. Although its fine as long as you weld it correctly, brace the weight of the turbo and WG and use flex on the exhaust pipes.

 

We only use 40.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dave@passenger &raquo;</TD></TR><TR><TD CLASS="quote">We only use 40.</TD></TR></TABLE>

What happened to your thinner products ? Also, how heavy is the end product with schedule 40?

 

Sounds like 40 to me.

 

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

What happened to your thinner products ? Also, how heavy is the end product with schedule 40?</TD></TR></TABLE>

We have only ever used sch40 for turbo exhaust manifolds.
A 4 cylinder manifold is usually around 17-21lbs, the bigger 6 cyl ones can go over 30lbs.

Weight savings don't mean much if you don't finish the race

 

Doesn't full-race use sch 10 316?

 

Modified by Vince64 at 8:48 AM 2/13/2008

 

sch 10 is what I have used. Many racecars that are turbo charged seem to have .065 tube with proper bracing. Sch 40 must be all about surviving a million and one heat cycles...or getting more weight in front of the front wheels

 

We do mostly off road racing, they need to survive intense heat cycles, and also abuse like water/mud spraying on the manifold while its hot or getting big air off a dune or crashing into a ditch and the like.

We have never had a crack or any sort failure for that matter, be it for racing or for street use, sch40 helps keep it that way.

 

reliability

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dave@passenger &raquo;</TD></TR><TR><TD CLASS="quote">We do mostly off road racing, they need to survive intense heat cycles, and also abuse like water/mud spraying on the manifold while its hot or getting big air off a dune or crashing into a ditch and the like.

We have never had a crack or any sort failure for that matter, be it for racing or for street use, sch40 helps keep it that way.</TD></TR></TABLE>

What alloy are you using ? 321, 316 or 302 ?

 

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

What alloy are you using ? 321, 316 or 302 ?</TD></TR></TABLE>


1020

 

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


1020</TD></TR></TABLE>

Thats a stainless?

 

Nope, stainless isn't reliable enough for our needs, that is a steel grade, we get it in 1018 or 1020, after the manifold is done we ceramic coat them inside and out.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dave@passenger &raquo;</TD></TR><TR><TD CLASS="quote">Nope, stainless isn't reliable enough for our needs, that is a steel grade, we get it in 1018 or 1020, after the manifold is done we ceramic coat them inside and out.</TD></TR></TABLE>


Uh wow ...let me see one of your manifolds please.

 

lol at carbon steel manifolds.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by narfdanarf &raquo;</TD></TR><TR><TD CLASS="quote">lol at carbon steel manifolds. </TD></TR></TABLE>

I used to MIG weld tons of them! They work great

sch 40 with techline coating

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MidShipCivic &raquo;</TD></TR><TR><TD CLASS="quote">Why do most go with 10 instead of 5 ?</TD></TR></TABLE>

The main reason is there are a limited number of mills (international and domestic) producing sch5 fittings these days. Not only does that affect the overall availability but price as well.

Seeing as how 1-1/2" s/5 is only .100" smaller on the OD with the same wall thickness as 2" OD x .065" wall tube the tubing is always the cheaper and quicker way to go.

 

SS expands and contracts more than carbon steel, this causes a lot of stress in the manifold and reduces reliability, I am not interested in being responsible for my customers losing races. Especially for the bigger events like Pikes Peak and the Baja 1000, which is what the above manifolds were used for.

I like building things with ss don't get me wrong, we do sanitary process work as well as automotive engineering. Its just for turbo exhaust manifolds, reliability is crucial, I don't take any chances or shortcuts.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dave@passenger &raquo;</TD></TR><TR><TD CLASS="quote">Nope, stainless isn't reliable enough for our needs</TD></TR></TABLE>
Well, that's certainly a new take on this..
I guess if your ceramic coating is good enough..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by rorik &raquo;</TD></TR><TR><TD CLASS="quote">
Well, that's certainly a new take on this..
I guess if your ceramic coating is good enough..</TD></TR></TABLE>

No, its not, why do you think everyone is using crs for flanges? I think as time goes on more people will start using steel for the primaries as well. Ceramic coating should be used on any exhaust manifold inside and out regardless of the material selected.