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So how come you don't see any twin down draught set-ups?
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Thread: So how come you don't see any twin down draught set-ups?

  1. #1

    So how come you don't see any twin down draught set-ups?

    Um...what more can I say? As I build up my lil car I'm dreaming of when I can put together a 'hotter' motor - which with the 1600 usually leads to twin side draughts. I have two 32/36 webers I was wondering is there anything inherently wrong with getting a mate to weld up a manifold and run them on the 'hot' motor as opposed to the side draughts? I know they wont be as GOOD as the side draughts, but I'll never spend enough to be anything more than some fun. Thoughts?

  2. #2
    nothing wrong with it i it suits your needs

    clearance with the front carb and the bonnet sloping down to the front maybe

    i just put motorcycle carbs on mine as cheaper then webbers or dellortos


  3. #3
    That's also something I've considered - I've heard they do work well. Is it a PIA though to have all most all the ignition stuff covered/inaccessable due to the carbs? I could live with a bluge/scoop in the bonnet if it's functional. I admit that twin down-draughts is more form than function, but they would look cool!

  4. #4
    Webbers or dellortos would also cover it wouldn't they ?

    i had to go this way as I have a dual brake master cyclinders and with webbers and the angle and depth would have hit
    bike carbs have a 30degree manifold angle

    tbh the gt carb and manifold worked ok it's just mine was worn out and I needed a new fuel pump
    was roughy $400 more then buying those new compared to putting these on

    not counting labour as did it myself

  5. #5
    Yes SIDE -DRAUGHT webers also cover it. Hence my idea of using twin 32/36 DOWNDRAUGHT carbys

    Then again, the lure of a supercharger also beckons....

  6. #6
    if i could buy a off the sehlf turbo or supercharger manifold i would
    i cant find anything anywhere

    my ability to make a manifold is non existant

    would be seeing a lot more forced inducted crossflows if something existed

  7. #7
    Yeah with the bowl-in-piston design of the motor it's not the best one to supercharge/turbo charge. But there are still a few out there. I'll also have to get a manifold made if I go that way. I'd ideally like to sit a modified (longer snout) sc14 like an old school roots blower with carb on top. We'll see......

  8. #8
    Here is a picture of my supercharged xflow.. Kits were available back in the late 60's and early 70's. Some folks these day are using BMW Mini blowers with a home made mountings etc. Mine go's very well on my 1700cc motor.
    Attached Images Attached Images

  9. #9
    What size is the blower, Captain?

  10. #10
    Its an Allard Shorrock C142B Unit. Designed to run on engine's up to 2.0 litre. Pushes around 8 psi boost which may not sound alot by todays standards but it moves very well..

  11. #11
    Do think that would be equivalent to an SC12 or SC14 in jap terms?

  12. #12
    Not sure Rob to be honest, Not into Jap stuff.. I don't see why they won't work as long as you get one from slimier size motor to the Xflow...

  13. #13
    manifolds seem to be the issue
    mate have tried to make them and they just crack and fail

  14. #14
    Is that due to the weight of the supercharger?

  15. #15
    My brackets are all made in 4mm steel plate at a guess on thickness, to hold the blower to the motor. All the manifolds are cast alloy. Its hard to make them for sure.

  16. #16
    on one of the facebook pages a guy was selling twin 40 downdraughts on a pinto manifold
    maybe you can adapt he face plate on one of these ?

    im unsure of the spacings if it will work but its been done for pintos

    trying to find the photo for you

  17. #17
    To answer the original question...

    Because they don't work.

    Air does not like to turn corners.

  18. #18
    juggs whats brake master cylinder do you run, and what front brakes

  19. #19
    it looks like datsun 180b or nissan patrol booster
    standard mk1 discs


  20. #20
    Some of the chrysler/ mopars used multiple 32/36's I think. They might give some ideas on how to link them. Plenty of other down draught options available, these 44idf's live in my Escort and give about the same power as the side draughts I've used in the past...
    Attached Images Attached Images
    Last edited by Rallye Sport; 4th August 2016 at 07:42 PM. Reason: crappy spelling

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