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Velocity Stack @ trompet carb

Discussion in 'MALAYSIA: LC150 / 135LC owners' started by phl6684, Sep 21, 2011.

  1. phl6684

    phl6684 Moderator Staff Member

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    A velocity stack is a trumpet-shaped device of differing lengths which is fitted to the air entry of an engine's intake system, carburetor or fuel injection. It is designed to:
    1. Allow smooth and even entry of air at high velocities into the intake tract with the flow stream adhering to the pipe walls.
    2. Modify the dynamic tuning range of the intake tract by functioning as a resonating pipe which can adjust the frequency of pressure pulses, based on its length, within the tract.
    [​IMG]
    Modern engines universally have tuned intake tract volumes and associated resonance frequencies, designed to provide higher than atmospheric intake air pressure while the intake valves are open - increasing the density of the trapped air in the combustion chamber (higher compression). Modified engines often have the original air box and associated ducting removed and velocity stacks are installed as accessories.

    Modern fuel injection systems with a plenum and single air inlet typically incorporate some sort of radiused entrance, designed to improve power, based on air flow increases. Power gains are usually at higher rpm.
    In amateur and professional racing, aftermarket velocity stacks are often used, as rules allow, and gains in the order of 2% to 4% can be obtained when inlet radii and stack lengths are optimized for that engine.
    OEM automotive manufacturers have many regulations to adhere to. One of these is noise. A properly tuned intake tract produces a rather audible intake noise under high airflow conditions - that is commonly "untuned" to allow the vehicle to pass EPA and DOT noise regulations.
    The length of the stack is known to have a direct effect on a particular engine's boosted power range.

    Most current aftermarket stacks are designed to be run "in" the airbox and a companythat does research well will have some applications that have all the same length and some applications that have differing lengths of stacks on different cylinders.
    It is commonly related that "stand off" (air–fuel mix that gets pushed back out of the port, usually at full throttle / low rpm) is somehow captured by installing a longer intake pipe (stack). but, it is actually that the intake valve is closing too late and the combustion chamber is simply overfilling and blowing back out the intake port, before the intake valve closes.A longer inlet pipe will create a later intake pressure wave that will help keep the air in the chamber until the intake valve closes.

    [​IMG]
    The acceleration of air flow into a duct is inherently a highly efficient process and the difference between even the crudest radius inlet, and the most aerodynamic shape possible is slight, amounting to no more than a few percent.The flow coefficient of a perfect entry would be 1.0 while the coefficient for a sharp edged entry would be 0.6 and a re-entrant plain pipe 0.5. In practice these latter types of entry are never used for engine intakes. There is always some attempt to provide some radius at the entry. This means that total engine airflow would not increase by the amount suggested by these figures, which apply only to the entry alone, as the inlet end is never the smallest or most restrictive part of the system. Because the greatest losses to flow occur near the valve seat, actual overall gain from any improvement of the entry flow would be much less.
    In the real world, on high-rpm IR IC engine, using a minimum amount of inlet radius gives the best wave strength and a power boost of 2% to 4% over a 3000 to 3500 rpm range. Using a larger radius, like 3/4", broadens out the resonant pressure wave rpm range, but the compression boosting pressure wave is greatly diminished and almost unnoticed by the engine.
     
    sniper31 and jangbest like this.
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  3. adam_john99

    adam_john99 Super Veteran

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    perrgghhh, terbaik.mesti maun cari nie....
     
  4. phl6684

    phl6684 Moderator Staff Member

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    heheeheh
     
  5. adam_john99

    adam_john99 Super Veteran

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    Bro phl jual kat saye la....ade byk saiz ker sbb utk uma karb 28mm mulut dier besaq
     
  6. phl6684

    phl6684 Moderator Staff Member

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    hahaha...xkn jual nye...hehehhe....phl bli saiz 30mm klu kt tzm ngam2 masok...klu kt kips ada angin langgar gk sket tp still ok..masok kt uma,smoothhh ja angin masok smpai intake...heheheheh
     
  7. adam_john99

    adam_john99 Super Veteran

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    kat sentul ade ker bro???
     
  8. phl6684

    phl6684 Moderator Staff Member

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    xde...nasib je klu jumpa...hehehehhe
     
  9. adam_john99

    adam_john99 Super Veteran

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    ape name bende tue, trompet karb ek???
     
  10. phl6684

    phl6684 Moderator Staff Member

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    yup..bahasa pasar...trompet carb...
     
  11. adam_john99

    adam_john99 Super Veteran

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    ok, mantap, nak cari japgi kot...
     
  12. phl6684

    phl6684 Moderator Staff Member

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    klu la jumpa n harga ok roger2...erk...nk 1..hehehe
     
  13. adam_john99

    adam_john99 Super Veteran

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    aik??phl pakai double carb ker aper??hahahahha
     
  14. Kayang

    Kayang Super Veteran

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    tak leh jadi nih.. aku nak pakai twin funnel lah mcm ni.. mau kasi sengat skit..:p
     
  15. adam_john99

    adam_john99 Super Veteran

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    alamak, twin karb VS twin funnel, berbisa nie....mantap....
     
  16. phl6684

    phl6684 Moderator Staff Member

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    mak aih..twin??huhuhuhuhu...xde maknanya...:D
     
  17. adam_john99

    adam_john99 Super Veteran

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    hehehehehe
     
  18. dinn977

    dinn977 Veteran

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    hi Guys... did you know where can i buy it... ???
    come... share with me...

    ckap omputih ler pulop..huhuhu
    bedal jer.. hehehe
     
  19. Kayang

    Kayang Super Veteran

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    Can find at any Racing boy shop.. hehe..
     
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  20. dinn977

    dinn977 Veteran

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    ok.. tq broo Kayang... u are cute... :D
    can i borrow your sunglass ? heeeee ~~~

    but.... it's OKay ka if i install at PE28mm ???
    and.. how prices its ??
    anyone ever try ??? please leave a comment here..
     
  21. kirawin

    kirawin Veteran

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    yup...kat kedai racing boy kat seksyen 7 s.alam ade trompet tue...just saw it, tp xtaw saiz...huhu
     

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