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Basic Enderle Barrel Valve Leakdown and Butterfly setting
Basic Set ups for Enderle (The 8 stack can apply to Hilborn also)
8 Stack: The smaller the engine the less % of leakdown the larger the more leakdown %
Unblown using Gasoline 8 Stack: .004” Butterfly gap 10% to 13% leakdown %
Methanol 8 Stack: .002” Butterfly gap 18% to 28% leakdown %
Ethanol 85% or 90% .003” Butterfly gap 15% to 20% leakdown %
Bug, Bird, Buzzard, and Big and Ugly or Upright with Square or K Valve:
Unblown: Gasoline – .005” Butterfly gap 12% to 15% leakdown %
Unblown: Methanol – .005-.006” Butterfly gap 28% to 34% leakdown %
Unblown: Ethanol – .005-.006” Butterfly gap 18% to 25% leakdown % (more % for E-98)
Single Butterfly throttle bodies will like .008” gap, sometimes even .010” same leakdown %
Bug, Bird, Buzzard, and Big and Ugly or Upright with Square or K Valve:
Blown Gas & Ethanol to 85% – .010” Butterfly gap 30% to 40% Leakdown%
Blown Methanol and 98% Ethanol .010” Butterfly gap 65% to 75% Leakdown (I didn’t stutter)
Blown Nitro above 50% – .013” Butterfly gap 75% to 80% Leakdown
8 Stack: The smaller the engine the less % of leakdown the larger the more leakdown %
Unblown using Gasoline 8 Stack: .004” Butterfly gap 10% to 13% leakdown %
Methanol 8 Stack: .002” Butterfly gap 18% to 28% leakdown %
Ethanol 85% or 90% .003” Butterfly gap 15% to 20% leakdown %
Bug, Bird, Buzzard, and Big and Ugly or Upright with Square or K Valve:
Unblown: Gasoline – .005” Butterfly gap 12% to 15% leakdown %
Unblown: Methanol – .005-.006” Butterfly gap 28% to 34% leakdown %
Unblown: Ethanol – .005-.006” Butterfly gap 18% to 25% leakdown % (more % for E-98)
Single Butterfly throttle bodies will like .008” gap, sometimes even .010” same leakdown %
Bug, Bird, Buzzard, and Big and Ugly or Upright with Square or K Valve:
Blown Gas & Ethanol to 85% – .010” Butterfly gap 30% to 40% Leakdown%
Blown Methanol and 98% Ethanol .010” Butterfly gap 65% to 75% Leakdown (I didn’t stutter)
Blown Nitro above 50% – .013” Butterfly gap 75% to 80% Leakdown