Rectangular and oval exhausts

[GripTerror]

Why hasn't anyone done this?

What I'm talking about is using (obviously not necessarily this thick) piping in these fashions:

http://1.imimg.com/data1/G/1/MY-978470/RECTANGULAR_PIPE_01_125x125.jpg

http://en.mutanox.de/imag/Teaser/Produktseiten_Teaser/produkt_ovalrohre.jpg

http://img.hisupplier.com/var/userImages/old/yousheng/yousheng$72010817.jpg

Especially something like this:
http://en.mutanox.de/imag/Produktbilder/ovalrohr.jpg

To me it makes complete sense to make fitment issues taken care of.. meaning on lower cars to not have to worry about bottom clearance, while allowing larger diameter for flow!

It may not be as simple as regular piped exhausts but... this makes complet sense for alot of the go low fellas.

[wh0aitznic0]

Circuit sports did this with their oval downpipe.

[kalypso123]

its a great idea, I thought of trying it but I havent had the chance.


if you can weld shoot for it

[allntrlundrgrnd]

Dr. Gas Exhaust - Store - 3" Oval Tubing and Bends (http://drgas.mybisi.com/product/194998/3-Oval-Tubing-and-Bends_1060292.html)

[mikefc]

Bending that doesnt seem fun.

[PerilousActs]

You more or less buy bends premade.

[nismoracingsx]

a lot of people don't even go low enough to need this, its the raccoon cannon near the back that causes problems...

[axiomatik]

The heat shield on my cat is pretty bent up and I'm not even that low.

[slideslidegnarslide]

actually a really good idea do it uppp

[unreal-]

Ive seen/read about Supra guys rocking 4" or 5" Oval piping. Since clearance gets really bad with the bigger pipings.

Try it out, and post it up!

[duffman1278]

It's been done, just isn't as common since the oval tubing is pretty expensive.

[ayuaddict]

that shit is expensive. planning on it if i go forced induction on the Z.

[WISH ONE]

This is the route im going for my exhaust, Burns Stainless.

[blue rexsti]

square exhaust looks retarded. Doesn't flow with the car!

[!Zar!]

square exhaust looks retarded. Doesn't flow with the car!

Because how exhaust tubing underneath your car looks is SO important.

[atutt]

I was never keen on the design of this car. But no one ever listened to me... Now they have to do it the way I told them to.. Anyway

http://i75.photobucket.com/albums/i285/atutt/Work/DSC04544.jpg

[soreballz]

Square piping would be stupid. It wouldn't flow (as in flow air) anywhere near as well as round piping.

[atutt]

In theory square/rectangle exhaust is supposed to flow more. A 2'', .065 wall square tube has more internal space than a 2'', .065 round tube..

[zylvia213]

I was never keen on the design of this car. But no one ever listened to me... Now they have to do it the way I told them to.. Anyway

http://i75.photobucket.com/albums/i285/atutt/Work/DSC04544.jpg

that looks crazy... good for really low cars i would think

[slideways2004]

I think most people dont do it because of cost. I would've done it but when I made my exhaust, I couldnt afford it

[fckillerbee]

Square piping would be stupid. It wouldn't flow (as in flow air) anywhere near as well as round piping.


are you talking out of your ass, or do you have a physical proof of this?

i mean...space is space. if they occupy the same amount of space, I don't see one flowing more than the other.

[Wabash9000]

I'm talking out my ass here, but I wonder if a round pipe might flow better because the air could vortex in the pipe. I don't know if that would make any difference. I wonder if the oval would change the sound at all. Straight pipe of the down pipe, no bends no nothing, would be loud as hell and might have a unique sound to it.

[duffman1278]

I'm talking out my ass here, but I wonder if a round pipe might flow better because the air could vortex in the pipe. I don't know if that would make any difference. I wonder if the oval would change the sound at all. Straight pipe of the down pipe, no bends no nothing, would be loud as hell and might have a unique sound to it.

The air flow, whether turbulent or round, wont really make a different. You would have to determine the reynold's number of a certain section in the pipe to determine whether it will be turbulent or laminar.

Assuming your cross sectional areas are the exact same, then it should not make a difference.

[!Zar!]

I was never keen on the design of this car. But no one ever listened to me... Now they have to do it the way I told them to.. Anyway

http://i75.photobucket.com/albums/i285/atutt/Work/DSC04544.jpg
Isn't that custom welded D shape exhaust?

[atutt]

Isn't that custom welded D shape exhaust?

D shaped exhaust?

I cut a length of 1'' stainless tube. Then had a company shear off some stainless sheet in 3'' widths sections... Or was it 4''???

Either way. I hate it. Wish I never made it now that I look back. Should have jsut told them to go pound sand so I can do it my way.. Which they ended up having to do after I left.

[BustedS13]

oval tipped exhausts just like that used to be in with eurotrash cars about a decade ago, when i was 16. maybe i'll scan some old super street NOPI ads for you guys.

i'm so fucking old :(

[!Zar!]

D shaped exhaust?

I cut a length of 1'' stainless tube. Then had a company shear off some stainless sheet in 3'' widths sections... Or was it 4''???

Either way. I hate it. Wish I never made it now that I look back. Should have jsut told them to go pound sand so I can do it my way.. Which they ended up having to do after I left.

Ohh, at first when I looked at it, it looked like you had taken a standard pipe and cut the bottom 1/4 off and welded a flat section to it. Now that I look at it, I see that it is four pieces. Looks extremely time consuming for such a fairly simple part; in terms of typical piping.

[kalypso123]

are you talking out of your ass, or do you have a physical proof of this?

i mean...space is space. if they occupy the same amount of space, I don't see one flowing more than the other.


the cross section of a square pipe gives you a little more area... ( the blue space ),
Assuming they're the same width across and height from top to bottom... the rounded ends rob you a little bit.


http://i614.photobucket.com/albums/tt228/kalypso345/space.jpg

[!Zar!]

I wonder how much flow my dick has.

[Matej]

What about non-convex polygon exhaust piping?


http://math.slu.edu/escher/upload/thumb/2/29/Regions-nonconvex.svg/207px-Regions-nonconvex.svg.png

[GSXRJJordan]

I'm going oval tubing for my FD center-out exhaust since the gas tank runs transverse across the rear and 3" circular piping would be too low. Vibrant sells some 2.5" x 4.5" x 5' sections I was going to buy, but now that I'm looking at Dr. Gas I might just pick up a bend (to cut up) and some straight sections.

I think most people don't do it because of cost, and the hassel of inevitably transitioning from oval -> round since turbos/headers/etc are all round.

i'm so fucking old :(

Yeah, it was very DTM. We're the same age btw, don't say shit like that lol.

[omgRWDgoodness!]

I wonder how much flow my dick has.

Maybe you should ask her-

http://s3.amazonaws.com/files.posterous.com/cwehate/rmRIantwnEUntmVosbwWSKqblQVbHIBZdyTPQJDPqefWu9BnrV 9Rt1YoyM6i/flo-1.jpg?AWSAccessKeyId=1C9REJR1EMRZ83Q7QRG2&Expires=1283501373&Signature=qHDenPmBn%2B6nAst3HfAYwORbzeE%3D

[ZilviaKid]

circles flow better per area then squares. its just a fact of life.

[PoorMans180SX]

When dealing with turbulent flow (like an exhaust) You measure flow using hydraulic diameter, which is the length of the sides. So a 1" square tube and a 1" pipe have the same hydraulic diameter.

Therefore, even though the square tube has a larger area than round pipe, they both have similar flow characteristics since they have the same hydraulic diameter. There really isn't any way to make the square tube flow better than the circular one since the turbulence gets "trapped" in the corners of the square. You'd have to use a square tube larger than the diameter of the circular tube to get "better" flow. Laminar flow is a different story but you won't get that with exhaust flow.

There is a reason that every car manufacturer/race car/race engine builder uses round exhaust.

[kalypso123]

flow characteristics since they have the same hydraulic diameter. There really isn't any way to make the square tube flow better than the circular one since the turbulence gets "trapped" in the corners of the square.

Nice! {msg}

[BustedS13]

Yeah, it was very DTM. We're the same age btw, don't say shit like that lol.

I had a bad experience with DTM tips once.

http://i89.photobucket.com/albums/k216/nerfdude/DSC00761.jpg

gives way to

http://i89.photobucket.com/albums/k216/nerfdude/jpeg-1.jpg

guess what happened :D

[GSXRJJordan]

Lol what a shitbox. Oh, and your bumper on fire sucks too!

<3

[S14DB]

I'm going oval tubing for my FD center-out exhaust since the gas tank runs transverse across the rear and 3" circular piping would be too low. Vibrant sells some 2.5" x 4.5" x 5' sections I was going to buy, but now that I'm looking at Dr. Gas I might just pick up a bend (to cut up) and some straight sections.

I think most people don't do it because of cost, and the hassel of inevitably transitioning from oval -> round since turbos/headers/etc are all round.

Burns has transitions.

http://www.burnsstainless.com/images/products/detail/rov-l.gif
Burns Stainless LLC - 304 Oval SS Tubing (http://www.burnsstainless.com/304ovalsstubing.aspx)

[slideways2004]

lol. my entire exhaust including downpipe cost about the same as 2 transitions. We had lots of 3" ss straight piping and just pie cut the entire thing

I have seen someone use a 2ft. long piece of oval tubing. For the transitions, we just carefully hammered a 3" round peice into an oval. Didnt look bad after we were finished