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mid pipe 4-2 crossover

Discussion in 'XJ Technical Chat' started by padre, Nov 21, 2010.

  1. padre

    padre Member

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    Has anyone ever disected that midpipe where the 4 headpipes go in and 2 tailpipes come out? does it have baffles? Does anyone have pictures?
     
    padre, Nov 21, 2010
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  2. apsolus

    apsolus Member

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    good question, im interested too
     
    apsolus, Nov 21, 2010
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  3. retread83

    retread83 Member

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    I checked out fabricating one with a buddy who builds custom bikes.We also thought about doing a tube collector. Wound up buying an excellent used one with all the donuts for 75$ shipping included. Search the forum,there is a link showing how to fab one. Don`t know about the back pressure issue.
     
    retread83, Nov 21, 2010
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  4. retread83

    retread83 Member

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    I checked out fabricating one with a buddy who builds custom bikes.We also thought about doing a tube collector. Wound up buying an excellent used one with all the donuts for 75$ shipping included. Search the forum,there is a link showing how to fab one. Don`t know about the back pressure issue.
     
    retread83, Nov 21, 2010
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  5. padre

    padre Member

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    well, I know there is some kind of baffling in it but what I was curious about was is the baffling for sound or flow and is there a common area all four cylinders share? I've taken off the head pipes and tail pipes and looked inside and it has some purpose. I just havent figured out what it is yet. I like the twinn pipes look, and the ground clearance of the stock system better then 4 in to one headers but can the stock setup be made more efficient?
    I may fabricate my own 2-1 twinn headers just to cut down on the weight and increase flow but how much room for improvement over stock is there?
     
    padre, Nov 22, 2010
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  6. bigfitz52

    bigfitz52 Well-Known Member Premium Member

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    What bike exactly are we talking about?

    If you're talking about the collector box as found on the 550s, the 650 Seca and a lot of the 750s, yes, there is some "magic" in there.

    The collector box is designed to aid scavenging and "fool" the exhaust system into thinking it's longer than it is. The baffling is for both sound and flow, as the sound waves bouncing around affect flow, and can be "put to work" to good advantage. The collector box does that.
     
    bigfitz52, Nov 22, 2010
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  7. retread83

    retread83 Member

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    O.k.Padre I found it for you.Enter diy collector box in forum search.
     
    retread83, Nov 22, 2010
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  8. padre

    padre Member

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    81 xj750rh
    Thanks guys, I thought it was for one or the other but not both. Almost like a resonator/collector.
    When I looked online at it, it didn't even have a name
     
    padre, Nov 22, 2010
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