Absorbing silencers These silencers work according to the principle of absorbing sound with the aid of an absorbent lining inside the silencer. They usually provide silencing over a broad frequency range. They are generally of straight-through construction and only offer a marginally higher back pressure than a straight pipe of the same length. Expansion silencers (reactive) These silencers work according to the principle of reflecting and holding it inside the silencer. The silencer has internal baffle plates that divide it up into sections. A reactive silencer creates a relatively high pressure back to the middle of the gas flow, ie the baffles that redirect the flow. Volvo Penta HD silencers combine reactive and absorbing silencing. Silencer location Reactive silencers are located as close as possible to the exhaust manifold as possible (to impede sound from the manifold) or at the end of the system. There must only be a short end pipe ( ≈ 1 m) after the silencer if ...
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