You can tell the importance of the muffler by the level of noise coming from your car or truck's exhaust system. Simply stated, the purpose of the muffler is to cancel out the sound waves produced by the engine as those waves travel through the muffler.
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What are sound waves?
In relation to an exhaust system, sound is a pressure wave formed from pulses of alternating high and low air pressure. Air pressure is created when an exhaust valve in the engine opens and a burst of high-pressure gas suddenly enters the exhaust system. The molecules in this gas collide with the lower-pressure molecules in the pipe, causing them to stack up on each other. They then stack up on the molecules a little further down the pipe, leaving an area of low pressure behind.
How does the muffler cancel sound?
Typically, the muffler is constructed in three layers: Two thin layers of metal with a thicker, slightly insulated layer between them. This allows the muffler to absorb some of the pressure pulses. The pipes going in and out of the main chamber are perforated with holes and are fine-tuned (just like a musical instrument) to reflect the sound waves so that they interfere with each other. The exhaust gases and the sound waves enter through the center tube. This allows thousands of tiny pressure pulses to bounce around in the main chamber, canceling each other out and also being absorbed by the muffler's housing.
For answers to your questions about your vehicle's exhaust system, contact the ASE Certified Technicians at Precision Automotive today by calling (406) 248-2838, or go on-line to www.pricesprecisionauto.com for more information. Our Tech-Net professional auto center in Billings, MT, also services vehicle owners in the areas of Shepherd and Laurel, MT.
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