Carby An interesting carb modification I found on Youtube

Discussion in '2-Stroke Engines' started by rjriggs, Sep 26, 2015.

  1. rjriggs

    rjriggs Member

    Check out this Youtube video:

    https://www.youtube.com/watch?v=5V2N5Sm8tYw

    This guy has a flexible pipe running from the air intake on the carb that turns around and faces forward to increase the air intake. Anyone have an opinion on this?
     

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  2. butre

    butre Well-Known Member

    cold air intake is good, but don't believe any ******** about a ram air effect.
     
  3. rjriggs

    rjriggs Member

    Are you positive? I'm definitely NOT a mechanic, but it seems this is doing the same thing a turbo would do, forcing more air in. Of course, it would vary depending on your speed...so I assume getting the air/gas mixture right would be difficult.

    Of course, you're probably right...as many other members are probably going to tell me! :dunce:

    EDIT: I just looked at the turbo thread. Now I feel like an idiot.
     
  4. butre

    butre Well-Known Member

    the carburetor can only take in so much air, you have to be going quite quick for a ram air effect to happen. a turbocharger gets more air through the engine by compressing it, not by just blowing it into the intake.
     
  5. wheelbender6

    wheelbender6 Well-Known Member

    I have seen other members do something similar using PVC pipe. The u-turn in the intake could make the make things a bit quieter.
     
  6. sp1ke

    sp1ke Member

    ram air does work to help feed fresh air in but u dont want a thin ass tube running straight from your carb that reduces air its better to ram in to a air box and with a long intake id have a one way valve like reeds on the air box so u never restrict only ever compress air in when traveling fast as i did with my 750 xsxsax.jpg

    a turbo uses exhaust gas to turn a fan that moves another to push air in
     
  7. sp1ke

    sp1ke Member

    the best way to ram air in to a carb compressed is by maintaining good presure in that box with a constant force in of air with say a in line extractor fan ..
     
  8. Based on some experimenting I did with motorcycles, I really do believe that ram air effect does give a noticeable boost in power. I find it amusing that this is pooh poohed in the press, because I made a ram air intake for a Sportster and it certainly worked. However it only came on at around 50 MPH.
     
  9. Frankenstein

    Frankenstein Well-Known Member

    I was going to say the same basic thing, ram air works just fine if you can move fast enough to actually drive the effect, note spikes 750, it certainly should work well on something that big.

    66cc poo poo bikes not so much..
     
  10. jaguar

    jaguar Well-Known Member

    It would reduce the vacuum in the carb and so you'd have to jet it richer (assuming it was correctly jetted before the ram air install).
    but this is all just theoretical talk since these motorized bikes are too slow to take advantage of this.
     
    Henkster and Frankenstein like this.
  11. Frankenstein

    Frankenstein Well-Known Member

    Bingo.
     
  12. Frankenstein

    Frankenstein Well-Known Member

    Hey lets hook a shop vac in blow mode into the carb and seal it up stick a 140 jet in it and see what happens.
     
  13. Frankenstein

    Frankenstein Well-Known Member

    And 3 or 4 quarts of ronsons lighter fluid for good measure!
     
  14. Frankenstein

    Frankenstein Well-Known Member

    What's the worse that could happen?
     
    Nate888 likes this.
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