took two of these (without the slip part) and slightly modified them.. they are form burnsstainless.. i'm not sure.. but it might be a crime to make your frist downpipe out of burns stainless parts



if you take a ruller to the bottom of these it angles UP about 5 deg.. i took a belt sander to both of the oval ends to make this angle.. Surprisingly i have pretty good ground clearance with the H22A in the CRX.. i gained 7/8" of ground clearance by doing this i actually baught 12" of oval pipe but i didn't need it in the end because of the angle that my motor is on.



see what i mean!

Dont mind the masking tape.. i was just trying to aim the dump pipe before I cut it for a flex bellow..



another picture..



another picture

... so how many packs of JB weld do you guys think it will take to seal this up?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 2point2 &raquo;</TD></TR><TR><TD CLASS="quote">... so how many packs of JB weld do you guys think it will take to seal this up? </TD></TR></TABLE>

Looks like a great alternative for low ground clearance setups.

BTW, one big industrial sized pack of JB should do it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Finest &raquo;</TD></TR><TR><TD CLASS="quote">Looks like a great alternative for low ground clearance setups. </TD></TR></TABLE>

i'll have to check into the industrial size pack!

i'm shocked that no one has tried this... my rough calculations show that the oval part is BIGGER than 3" (not smaller like someone might first assume).. I will take a verneir to the oval part and show the math tomorrow.

 

awesome work man.........really really smart........and looks very simple and well done.

any pics of the rest of the turbo setup? i know many of us have been following your cars progress for a couple of years........

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by redzcstandardhatch &raquo;</TD></TR><TR><TD CLASS="quote">awesome work man.........really really smart........and looks very simple and well done.

any pics of the rest of the turbo setup? i know many of us have been following your cars progress for a couple of years........</TD></TR></TABLE>

Thanks bud...

I will have more pictures when i get the (aluminum)IC pipes back from welding.. i might do a small writeup on how i mocked them up without welding... it worked out very well..

 

cool cool!

your car pretty much rocks.

recently i have had some h-series/ef experience also.


my old daily (traded to good buddy) just got a h23 into it.......mated to a d16a6 trans.

lots of measuring and cutting with a 30,000 dollar machine makes for a long weekend. but the plate works.......

big engines are fun as hell. cant wait to see the power yours makes.-adam

 

looks great lets get some close clearence pics of it installed when its finished. looks awsome great idea

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by AllmotorEH2 &raquo;</TD></TR><TR><TD CLASS="quote">get some close clearence pics of it installed when its finished.</TD></TR></TABLE>

Will do!

 

i would personally bring it to a muff shop to get it TIG welded. looks sexy beaded. thats a pretty good job though

 

wow you must have some very nice muffler shops by you, over here, all we have are old fat men armed with mig welders, they probably dont even konw waht a tig is

 

i work at one! no im fat and old...

 

the muffler shops around here dont have tig... and they can't mig better than me anyway lol.. I'll be talking it to someone who can TIG.

 

is it finished yet Paul? Does the damn car run?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Clayton &raquo;</TD></TR><TR><TD CLASS="quote">is it finished yet Paul? Does the damn car run? </TD></TR></TABLE>

School is finished!! so the car will run soon. you might see it if you go to the local honda-tech meet on the 25th

 

What size diameter is that exhaust pipe agian? I didnt read anywhere it saying the diameter.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ExploitedRacing &raquo;</TD></TR><TR><TD CLASS="quote">What size diameter is that exhaust pipe agian? I didnt read anywhere it saying the diameter.</TD></TR></TABLE>

3".. the oval is not really 3" though.. just sold to match 3" pipe..

 

very good job bro,

 

if you were wondering

if you take 3" pipe and sit on it, or otherwise distort the cross section, but keep the same circumference, you will decrease the area of the cross section.

We did a proof of it last year in MA166 @ purdue (calc 2). Basically if you take the area of an ellipse formula, and then graph each dl (distance between foci) vs the associated area, the graph will look like a hump, and at the top is dl = 0.

This means the ellipse has the largest area when the distance between the foci is zero. This is a special ellipse called a "circle" which we hear about all the time.

I DID NOT mean for that last bit to sound shitty or anything, it just kinda came out that way, but if someone wants i'll plot it in like MATLAB or MAPLE so we can see what the real difference is in case this whole "smashing exhaust" thing catches on.

Maybe if we know how much to smash a 4" to make it flow like a 3" we can all have like .75" more ground clearance, or we could just smash the pipe where a gas tank or something is.

This is a really good idea!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EGmikeH22 &raquo;</TD></TR><TR><TD CLASS="quote">so we can see what the real difference is in case this whole "smashing exhaust" thing catches on.

Maybe if we know how much to smash a 4" to make it flow like a 3" we can all have like .75" more ground clearance, or we could just smash the pipe where a gas tank or something is.

This is a really good idea!</TD></TR></TABLE>

There was not 'smashing of exhaust' done here I wouldnt have done this if all i had to do was slide a peice of wood through a peice of straint pipe and start hammering away lol.. this is how burns stainless lables their oval pipe.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by "Burns Stainless" &raquo;</TD></TR><TR><TD CLASS="quote">The nominal “size” is roughly equal in area to round tubing of that diameter</TD></TR></TABLE>

http://www.burnsstainless.com/....html

I'm assuming that you are talking about the calculations at EACH end only?.. not the cross section of the oval plane --&gt; round plane x (amount of distance)

^^ does this make sense? cause i'd also like to know of there is a decrease in area anywhere "along" the trasition. but for now.. lets look at the basics by taking some quick measurments. I actually calulated 3.4" .. but i was WRONG - sometimes i cant read my own handwriting let me look at this again.


"Actual" I.D. of 3" tube.


"length" of oval tube



"height" (dia) of oval tube

i calculated the oval area to be equal to an I.D. (circle) of 2.754" tube

that makes (roughly) a .096 dia differance between a "3 inch tube" and the "oval tube".. correct me if i'm wrong because i always do this stuff at the very end of the day

I'm glad you brought this up because my calculations were off originally.. but i dont think (not trying to sound like an *** towards you) that less than 1/8" difference in dia is even worth talking about... well, maybe on Honda-Tech where you need a 54" downpipe for 300whp.. but not in the real world

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 2point2 &raquo;</TD></TR><TR><TD CLASS="quote">


I'm glad you brought this up because my calculations were off originally.. but i dont think (not trying to sound like an *** towards you) that less than 1/8" difference in dia is even worth talking about... well, maybe on Honda-Tech where you need a 54" downpipe for 300whp.. but not in the real world </TD></TR></TABLE>

Hey get it right its 56".

Anyway thats a great idea.

 

another way to test it for a changing oval would be to take one of those pipes that starts round and goes to oval, than take a pipe that is the same diameter at the round and just stays there the whole time (regular pipe)
then take the oval one, set it up on end on a table or something, and fill it with soemthing like...rice.
then take the amount of rice it took to fill that one to the brim, and pour all of that into the straight up 3" pipe.

you'll then be able to take a % difference in the height of the rice, and see the difference in volume (with some error because of the way the rice lines up with itself or packs into the tube)

as far as 8%, its better to know exactly what the difference is, than to just go "i bet its the same" now you know you can get even flatter pipes and have it not really matter (if your calcs are right)

 

yowza!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">i calculated the oval area to be equal to an I.D. (circle) of 2.754" tube

that makes (roughly) a .096 dia differance between a "3 inch tube" and the "oval tube".. correct me if i'm wrong because i always do this stuff at the very end of the day

I'm glad you brought this up because my calculations were off originally.. but i dont think (not trying to sound like an *** towards you) that less than 1/8" difference in dia is even worth talking about... well, maybe on Honda-Tech where you need a 54" downpipe for 300whp.. but not in the real world
</TD></TR></TABLE>

Actually, the CSA is less important in non-circular sections than a property known as the "hydraulic diameter". The hydraulic diameter is 4*CSA/perimeter, which you will see from punching the numbers, comes out to be equal to the actual diameter in circular CSA's. For your oval, however, you will see that the hydraulic diameter is actually a fair bit smaller than the 3" tube, meaning it is a significant restriction. (Assuming that you actually NEED 3" tubing to prevent compressible flow, which is unlikely)

 

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

DOH!

Thanks man.. you learn something every day on the welding/fab forum!