I've been kind of trying to look around to no avail and find a peice of exhaust piping which is 3" diameter that flattens out (gets more width and becomes shorter in height) to run under the oil pan and then opens back up to 3" diameter.

Basically the problem is that if I run a 3" downpipe under the oil pan I'm fairly certain it will be crushed. This is for a turbo setup on a H22 in a EG. Might just say expletive it and go open downpipe FTW.

 

you could get a pipe that is in a oval shape for under the oil pan ive seen them before. i have the same issue with my setup by i just dont drive over speed bumps
check out this place http://www.drgas.com/store/home.php?cat=8

 

crush it down some in a bench vice?

 

well, you could always raise your car up......the oval pipe idea sounds like it would work fairly well, don't know where you'd go about findin one though

 

I crushed mine in a vice, the downpipe was already built, ran under the downpipe but I kept scraping it, so I took it off, crushed that portion in a vice until it was probably close to 4.25" across and I havent had a problem since

The best actually "thought-out" pancake Ive seen, search 2point2's build thread for his downpipe, he made one for an h22 crx that was very nice

 

any sort of pancake is going to cause you to lose flow, so make sure that it bigger that a 3" pipe. If you have a 3" dp crush 4" pipe to make the pancake otherwise it will be like putting a nozzle in your exhaust

 

No

You sir, are wrong

You still have the same TOTAL flow going through

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by PINKS &raquo;</TD></TR><TR><TD CLASS="quote">No

You sir, are wrong

You still have the same TOTAL flow going through</TD></TR></TABLE>

So if I crush it flat it will still have the same flow as if it were round?How about just a half inch tall?

 

If you ask I'm sure they will cut it the length you want
http://store.racing-solutions.org/turboforms.html

 

The Dr. gas site sells frame clearance pipes, which flatten out but have circular ends to weld pipe to it. Not sure how long of a flat section they can make you, but give em a call.

 

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

 

This is 2point2's downpipe PM 2point2 for more info.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by PINKS &raquo;</TD></TR><TR><TD CLASS="quote">No

You sir, are wrong

You still have the same TOTAL flow going through</TD></TR></TABLE>

errr, less cross-sectional area = less flow capacity. It's actually worse than using a smaller round pipe with the same cross section area because the flow is in contact with more wall area, causing more friction.

If you want to make an oval section get some 2.5" tube and cut it lengthwise, then weld flat pieces between the two U shaped sides. Or maybe fill a 4" tube with sand and hammer it down. take pics!


Modified by Bailhatch at 7:34 AM 1/8/2007

 

ya the way I figure, the more you crush it the worse it gets, eventually it will be shut. So any crushing will hurt overall flow

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by PINKS &raquo;</TD></TR><TR><TD CLASS="quote">No

You sir, are wrong

You still have the same TOTAL flow going through</TD></TR></TABLE>

Fill a plastic cup with water and squeeze the sides in until it's oval. Does the water level rise?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tony1 &raquo;</TD></TR><TR><TD CLASS="quote">Fill a plastic cup with water and squeeze the sides in until it's oval. Does the water level rise?</TD></TR></TABLE>

No it doesnt for me but I think that was becuase the cup cracked as I squeezed it lol

-James

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tony1 &raquo;</TD></TR><TR><TD CLASS="quote">

Fill a plastic cup with water and squeeze the sides in until it's oval. Does the water level rise?</TD></TR></TABLE>

Er, Tony....we're talking about exhaust pipes, not water. And who in their right mind will build an exhaust out of plastic? Duh?!