Mufflers

Mufflers Points : Mufflers, Definition A muffler reduces the pressure pulses and resulting noise produced by the engine exhaust. When an engine, is running, the exhaust valves are rapidly opening and closing. Each time an exhaust valve opens, a blast of hot gas shoots out of the engine. Without a muffler, these exhaust gas pulsations are very loud.

Note how chambers, tubes, hoIes, holes, and baffles are arranged to cancel out the pressure pulsations in the exhaust.