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    Setting up Most Hilborn Barrel Valves

    Setup for popular Hilborn Barrel Valves
     Click here to buy our Barrel Valve Leakdown Tester: https://www.alkydigger.net/proddetail.php?prod=LeakdownAD

    Hilborn w  #54 Spool – 8 Stack injections

    Unblown Alcohol

    Small engine  16%-20% with  .002” Butterfly 30 lb  secondary

    Big engine  20%-24% with .002” to .002” Butterfly 30  lb secondary

    .020” Wire spring in main by pass –  2-3 lbs

     54 barrel valve

    Unblown Nitro

    The higher the %, the more leakdown and larger air gap in the butterflies  

    IE: 10% nitro = add 10% to leakdown % – Reduce the secondary pressure by 10%

    Butterfly gap gets widened as nitro % increases –

    use  .002” for up to 10%
    .003” for 15% to 20%   30# secondary
    .004” for 20% to 30%  10# secondary
    For more Nitro than 30% – use a #56 Spool

    54 barrel valve

    Unblown Gas

    Small Engine  10%-12% leakdown with  .004” Butterfly  30 lb secondary

    Big Engine  12%-14% leakdown with .004” Butterfly 30 lb secondary

    Spring in by pass =  .016” 1 lb pressure

    Blown Nitro-   4 port or Shotgun

    #56  #61 Spool

    30% Nitro =  50% leakdown with .013”  Butterfly 12 lb secondary

    40% Nitro=  60% leakdown with .015”  Butterfly 8 lb secondary

    50%-60% Nitro = 70% leakdown with  .015” Butterfly 5 lb. Secondary

    Blown Alky:  4 port or Shotgun

    With 54 Spool:

    30% leakdown  .008” B Flys 5 lb. secondary

    With 56 Spool

    35% leakdown  .008” B Flys 5 lb. secondary

    Blown Gas  w 54 spool:

    25% leakdown with .010”  B Flys 30 lb secondary

    Blown Gas w 56 Spool:

    25% leakdown with  .010” B Flys 35 lb. Secondary