Automotive Dictionary: Exhaust Silencer (muffler)

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Automotive Dictionary: Exhaust Silencer (muffler)


Throughout this site we use many technical terms, and given the breadth of readership our site enjoys, sometimes we are remiss and incorrectly assume everyone knows what we are referring to. For those that do not, here are some explanations of the technical terms use.
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Exhaust Silencer (muffler)


Expansion chamber in the form of a canister interposed into the exhaust system. It may be a fairly simple box with inlet and outlet pipes protruding inside so that the change of direction of gas flow and change of pressure provides some silencing effect. Usually the box is fitted with baffle plates to cause further changes in direction and sometimes, in the interest of reducing back pressure, the exhaust pipe runs straight through but has many holes drilled in it and has a surrounding packing of glass-fibre or asbestos for sound deadening. On some cars several silencers of differing types are used with the object of maximum silencing with minimum back pressure.
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