Gutting the exhaust collector?

Discussion in '1st & 2nd Generation 1983-1989' started by 4a15, Oct 24, 2012.

  1. 4a15

    4a15 New Member

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    I've got an 85 vf700f with the sole of a VF1000f (engine transplant). I had no option but to re-use the vf700f exhaust system. My question is does anyone know what kind of "magic" happens inside the collector under the engine? Has anyone ever gutted the thing? Would that hurt or help. If the crap in there is only for sound management, then would it flow better if it was gutted?

    AND.... If if was gutted, would it be possible to block off one side and go single exhaust?

    Thoughts?
     
    4a15, Oct 24, 2012


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  2. tinkerinWstuff

    tinkerinWstuff Administrator Staff Member

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    the collector has to do with balancing pressure and maintaining torque across a wide range of RPM. There really is nothing to gut, it's like an expansion chamber similar to what you see on modern day two stroke engines. There are photos on the forum somewhere of one that's cut open but I don't have time to try and track it down at the moment.
     
    tinkerinWstuff, Oct 24, 2012


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  3. 4a15

    4a15 New Member

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    k, I will award 2 cool points to anyone who can point out the link to the photo of the cut open collector. I guess I'm too stupid to find it on my own.
     
    4a15, Oct 24, 2012


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  4. tinkerinWstuff

    tinkerinWstuff Administrator Staff Member

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    [​IMG]
     
    tinkerinWstuff, Oct 24, 2012


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  5. TOE CUTTER

    TOE CUTTER Mullet Man

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    The only real benefit would be to gain some ground clearance as they tend to scrape the ground pretty easy when cornering.
     
    TOE CUTTER, Oct 24, 2012


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  6. Scubalong

    Scubalong Official Greeter?

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    Tink is the Man, he is on top of it................:thumb:
     
    Scubalong, Oct 24, 2012


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  7. vfraaron

    vfraaron New Member

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    So headers would take away some of the power then
     
    vfraaron, Oct 24, 2012


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  8. bikeman

    bikeman New Member

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    I'm no expert but you would game some hp/torque on the high end rpms and lose on the bottom end. Hard to imagine less on the bottom though.
     
    bikeman, Oct 24, 2012


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  9. tinkerinWstuff

    tinkerinWstuff Administrator Staff Member

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    in theory, the stock exhaust would be tuned for best torque at normal operating RPM and as flat a torque curve as possible.

    If you want better sound and looks and are willing to risk the possibility of sacrificing 1-3lb/ft of torque and possibly peak HP, then go for it. Do it right and with a little research behind you and you could probably break even or maybe even get some improvement in one area or another. Just depends on what you're goal is.

    You should be able to do a baseline Dyno run at a local shop for around $60 that would give you your air/fuel ratios. (no tuning or adjusting). Especially coming into winter now. Then play all you want and you can verify your results later.
     
    tinkerinWstuff, Oct 24, 2012


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  10. vfraaron

    vfraaron New Member

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    I was only asking cause my 700f already had the headers on it when i got it so i dont know how it acted stock
     
    vfraaron, Oct 24, 2012


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  11. tinkerinWstuff

    tinkerinWstuff Administrator Staff Member

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    I'm with bikeman then. Based on typical exhaust theory, probably less low RPM torque and more peak HP. Probably not enough of a difference that the average rider would know the difference using the seat-o-the-pants dyno method

     
    tinkerinWstuff, Oct 24, 2012


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  12. vfraaron

    vfraaron New Member

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    Lol on seat-o-pants nd thank u
     
    vfraaron, Oct 24, 2012


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  13. 4a15

    4a15 New Member

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    Thanks Tink, as promised
    .. (two cool points!!!)

    I had no idea all that crap was inside the rusty old beat up collector. I figured there was a few cheep baffles in there, something I could dig out with a screwdriver - no way that is going to happen. I was really hoping to make one big expansion / "crossover" out of the collector, then close off the left side and run a large single muffler.
     
    4a15, Oct 24, 2012


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