Edward Nygma
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Exhaust flapper vales
Edward Nygma replied to asalinasz39's topic in Engines & Drivetrain (V8, Duramax, TurboMax)
Unfortunately it's a mass that's needed to avoid fluttering of the valve, resulting in flutter noise. Usually the valve sould be completely open in WOT and high RPM range, therefore not causing any backpressure (and loss of power) any more. Except the restriction by the mass which was not intented until noise issues occured.
