John B

iTrader: (10)

I am finalizing my exhaust system design and will be using an "X" pipe located behind the headers which will feed true 3" duals. My question, is there an actual formula to determine the optimum amount of pipe section that should be "siamesed" with the opposite side when constructing an "X" pipe to allow the exhaust to "overflow"?

fastlif

iTrader: (1)

there is a science but i think you can simplify it enough to make it work...only a few hp anyway. i always heard when we were running 5.0 mustangs that you can paint the pipes with cheap paint, go run the hell out of it and put the cross pipe where the paint is cooked off the most. of course this was a H pipe not x pipe. not sure how to figure length of connection etc.

just my $.02

Black Sunshine/ 00SS

iTrader: (1)

Based on conversation I had with Dr Gas, and also a place in NY that deals with this (see July issue Hot Rod Mag), the X works best when placed as close to the headers as you can.
On the F-body, you are limited as to where it will actually fit. The closest you can get to the headers and have it fit the car, is right under the driveshaft yolk. My scientific testing at the track gives the X-pipe 2 thumbs up <img src="graemlins/gr_cheers.gif" border="0" alt="[cheers]" />

John B

iTrader: (10)

Thanks for the feedback guys as to the location, but I already have a good idea on where the "X" pipe should be located. Since I will be fabricating my own "X" pipe to fit my chassis, my question deals with the actual amount of cross-sectional area that the two 90° welded together sections share in common (note blue arrow below):

I am trying to determine if, as an example, should this be 10% of total cross-sectional area, 15%, etc. or if it really matters. Thanks!

[ December 16, 2001: Message edited by: John B ]</p>

fastlif

iTrader: (1)

i would think it needs to be as close as pipe diameter as possible. <img src="images/icons/confused.gif" border="0"> <img src="images/icons/confused.gif" border="0">