Michael, a well designed or fabricated H pipe will not leak. My muffler
guy used std composite gaskets, and when I took the headers out the
second time, I used a copper gasket, and again no leaks.
Also look at Theo's second site for HP and Torque numbers on H and X pipes.
Larry
mmcbeth@peacock.ca wrote:
>Steve,
>
>The point of the crossover, as you may know but didn't make clear, is not
>just to equalize the pulses but use one pulse to "scavenge" the next. Just
>like drafting in bicycles (or NASCAR), each pulse can pull along the next
>one. Knowing that, the X design has an obvious advantage over an "H": no
>right hand turns. Having said that, I think you have to have a pretty
>sophisticated design to take advantage of scavenging: if two pulses
>arrived simultaneously in an X pipe I suspect you'd create unpleasant
>turbulence. Two stroke dirt bikes have custom designed expansion chambers
>in their exhaust to take advantage of scavenging, and one dent can
>dramatically alter their power.
>
>In short I think an "H" pipe is better than no crossover, and a WELL
>DESIGNED "X" pipe is better than an "H" pipe. I suspect a badly designed X
>could be worse than an H. I know the whole plumbing nightmare made me
>decide not to bother. Either crossover makes transmission access more
>challenging unless you install flanges, and in my experience every exhaust
>seam is prone to leak. Interesting theory, though!
>
>Michael
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