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Twin side draught manifold - Bridge or not to bridge??

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razzle308
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2012/02/11 17:34:14 (permalink)
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Twin side draught manifold - Bridge or not to bridge??

 
 
That is the question.
I've read so much stuff about it i don't know what to do.
I no longer have a booster - so no vacuum to worry about.
I am going to run a catch can - so no PCV to worry about.
So.... do i bridge the ports between the two inlets on each carby or should i block them of so each inlet tube is individual and what are the pro's and con’s associated with either or does it really make no noticeable difference??
Thanks, Darren.

http://www.classic-ford.org/cfp/tm.aspx?m=40148
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    Wozzah
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    Re:Twin side draught manifold - Bridge or not to bridge?? 2012/02/11 17:47:17 (permalink)
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    razzle308

     

    That is the question.
    I've read so much stuff about it i don't know what to do.
    I no longer have a booster - so no vacuum to worry about.
    I am going to run a catch can - so no PCV to worry about.
    So.... do i bridge the ports between the two inlets on each carby or should i block them of so each inlet tube is individual and what are the pro's and con’s associated with either or does it really make no noticeable difference??
    Thanks, Darren.

     
    No need to bridge them, leave them alone
     
    Cheers,
    Woz

    Mk1 RS2000 replica (IP hillclimb car) fitted with Ford Laser 1.8 DOHC (BP) Cossy cams, Webers, 230hp
    EB XR8 5sp, heads, cam, extractors.
    http://www.facebook.com/p...rmance/135194779879292
    #2
    razzle308
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    Re:Twin side draught manifold - Bridge or not to bridge?? 2012/02/11 20:25:40 (permalink)
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    well they are already so it's more a matter of should i block the bridges?
    And why?

    http://www.classic-ford.org/cfp/tm.aspx?m=40148
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    Re:Twin side draught manifold - Bridge or not to bridge?? 2012/02/11 23:51:12 (permalink)
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    Since you no longer need vacuum, block them up.
    Cheers

    1979 RS 2000 - SR20DET
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    razzle308
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    Re:Twin side draught manifold - Bridge or not to bridge?? 2012/02/12 22:54:01 (permalink)
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    Why??
    What effect will not blocking them have??
     

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    Wozzah
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    Re:Twin side draught manifold - Bridge or not to bridge?? 2012/02/12 23:46:16 (permalink)
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    razzle308

    Why??
    What effect will not blocking them have??


     
    It can effect pulsing in the runners at part throttle, and at wide open throttle it can cause turbulence in the runners (depending on how they are done).  I really don't think in your application its going to effect it much at all, so suit yourself as the whether you block them or not.  If you are going to block them do it properly (no dags in the runners etc).
     
    Woz

    Mk1 RS2000 replica (IP hillclimb car) fitted with Ford Laser 1.8 DOHC (BP) Cossy cams, Webers, 230hp
    EB XR8 5sp, heads, cam, extractors.
    http://www.facebook.com/p...rmance/135194779879292
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