Is schedule-40 that much more necessary than schedule-10 when using 304 stainless? For 1.5" pipe, I can find find the straight and 45 deg in schedule-40 but I can't find the 90 deg anywhere. Otherwise, I can get all of the bends in schedule-10. Also, if anyone knows anywhere online with pricing for 90 deg schedule-40, it would be much appreciated. Thanks.
-
"Youth in Asia"...I don't see anything wrong with that.
i think 10 is thick enough, thats what im changing over to, its more than 2 times as thick as 16gauge
R.I.P. Brian Klocke, you will never be forgotten
I guess I should have also mentioned that I was considering 304 because I can't find 321 Stainless in anything.
Street Turbocharging by Mark Warner mentions not to use 304 because "Stainless 304 is prone to carbide precipitation when held at the high temperatures experienced in a turbo manifold."
Boosted2point4 wrote:i think 10 is thick enough, thats what im changing over to, its more than 2 times as thick as 16gauge
That's exactly what I was thinking, but if you look around, it seems like people are only using schedule-40...with the exceptions of some of the cheap asses who do it in the .065" 16 gauge. But, then again, mine wouldn't be going on a 400+ whp car.
-
"Youth in Asia"...I don't see anything wrong with that.
I don't know if it's the same with all of them, but most of the schedule 40 built manifolds I see are mild steel instead of stainless. Stainless schedule 10 should be plenty thick for a turbo manifold, and it's what I'm using to build mine.
By the way, where did you find the stainless schedule 40 bends?
_________________________________________
450WHP Turbo Ecotec swap in the works...
Brian Whalen wrote:I guess I should have also mentioned that I was considering 304 because I can't find 321 Stainless in anything. Street Turbocharging by Mark Warner mentions not to use 304 because "Stainless 304 is prone to carbide precipitation when held at the high temperatures experienced in a turbo manifold."
Boosted2point4 wrote:i think 10 is thick enough, thats what im changing over to, its more than 2 times as thick as 16gauge
That's exactly what I was thinking, but if you look around, it seems like people are only using schedule-40...with the exceptions of some of the cheap asses who do it in the .065" 16 gauge. But, then again, mine wouldn't be going on a 400+ whp car.
LOL i guess thats an insult to me..... i built my header out of 304ss and its 16gauge...... never have had any problems.......oh an i have a 450whp car....
R.I.P. Brian Klocke, you will never be forgotten
Boosted2point4 wrote:Brian Whalen wrote:I guess I should have also mentioned that I was considering 304 because I can't find 321 Stainless in anything. Street Turbocharging by Mark Warner mentions not to use 304 because "Stainless 304 is prone to carbide precipitation when held at the high temperatures experienced in a turbo manifold."
Boosted2point4 wrote:i think 10 is thick enough, thats what im changing over to, its more than 2 times as thick as 16gauge
That's exactly what I was thinking, but if you look around, it seems like people are only using schedule-40...with the exceptions of some of the cheap asses who do it in the .065" 16 gauge. But, then again, mine wouldn't be going on a 400+ whp car.
LOL i guess thats an insult to me..... i built my header out of 304ss and its 16gauge...... never have had any problems.......oh an i have a 450whp car....
Mine is all 304ss also... No problems. I know Brandon's still looks like new...
P&P Tuning
420.5whp / 359.8wtq
^^^^ Sorry Fetter, I seriously had no idea...lol
Spilner521 wrote:I don't know if it's the same with all of them, but most of the schedule 40 built manifolds I see are mild steel instead of stainless. Stainless schedule 10 should be plenty thick for a turbo manifold, and it's what I'm using to build mine.
By the way, where did you find the stainless schedule 40 bends?
This is where I was looking at first...
click
But now, I found another place out of Pennsylvania that has the elbows in 321, but they work with price quotes. So, I'm not sure if they will sell to the general public in smaller quantities, and I'm not sure how much they will charge. I am just about to try and send them my list to see how much they will quote me...
GO AMERICAN STEEL!!!!
And that is a good point Spilner, mild steel does have a much lower tensile strength than the stainless metals, so you may have something there. But I was reading on a bunch of the other turbo sites, such as those working with minis, nissans, etc, and it seemed like they all were using schedule-40 stainless.
-
"Youth in Asia"...I don't see anything wrong with that.
Well I heeded the advice of the JBO and just sent them the quote for all the pieces I would need (plus some) in Seamless Schedule-10 321, so I guess I'll see if they will deal with me.
-
"Youth in Asia"...I don't see anything wrong with that.
I've always heard 321 is better, but there's tons of manifolds and headers made out of 304
sch 10 = .109"
sch 40 = .145"
304 will be fine. Its not the material its the design of the manifold thats usualy the week link. Suport your turbo!
People that use 16awg are not cheap asses. A sch 10 elbow is about 10 bucks a 16awg is about $35. 16awg is a much better building material for any header. You should know this if your building a manifold.
- 97 Z24 Racecar work in progress
- 04 WRX STi
ATR Crew Member
^^^^ please explain how a tube that is half as thick as sch-10 of the same exact material is
Atomic wrote:...a much better building material for any header...
Sorry Atomic... I know you build headers, but that makes absolutely no sense at all to me. It might be lighter because it is
less dense...which would shave weight, but that certainly doesn't make it "better." I personally would take strength/longevity of the part over weight saving anyday. Thicker walled tubing also should keep exhaust temps higher in the manifold, causing a slower disipation of heat to the outside air, which is an important aspect to helping spool the turbo.
The only other benefit from 16 gauge I could think of would be that it's inside surface area tends to be smoother than seamless butt-weld SCH piping. But no one said you can't smooth out the inside of schedule piping.
Seriously, though Atomic. I would really like to hear your reasons.
EDIT: I wasn't thinking. I meant thinner walls of the same density. sorry
Edited 1 time(s). Last edited Saturday, October 20, 2007 6:32 PM
-
"Youth in Asia"...I don't see anything wrong with that.
16 awg is preferred over sch10 by many builders for a few reasons. One being as you stated weight. That only really comes into play in race cars. Street applications i would take the strength of sch10 over thin wall. The biggest benefit is building design and collector design. When it comes down to sch 10 collectors kinda suck compared to thin wall merge collectors. Thin wall is much easier to design for high end step designs. sch 10 you get 1 1/2 thats it. last the under hood temps are higher with the thicker tubing. I would prefer a coated thin wall over a thick wall. Temperature has such a small impact on turbo spool it would be hard to even feel the difference. Runner length has more of a impact on spool up than heat ever will.
These are all subject to opinion though just like anything elts. Whats desirable for the street is not exactly what would work best at the track. Its hard to really find hard facts that have been tested so people tent to go with theory. Whens the last time you seen anyone dyno test turbo header vs turbo header.
I will say this. I build all my street application turbo manifolds out of sch 10 now and have yet to have a problem or cracking issues. I also build all my full race application headers out of 16awg and haven't had any problems or cracks with these either.
- 97 Z24 Racecar work in progress
- 04 WRX STi
ATR Crew Member
Thanks Atomic
-
"Youth in Asia"...I don't see anything wrong with that.
hey, i was wondering if i could see some of your manifolds, i'm looking into putting a turbocharger on my car (03 sunfire) and i was going to make a manifold instead of buying one, priced em up and i really don't wanna pay that much for one..any help ??
