Car/Truck mufflers do amazing work muffling noise. A car is nearly silent when running with a muffler, compared to what it would sound like with open manifolds. When I fire up my Honda push mower, the whole neighborhood knows about it, and it’s actually kinda quiet as mowers go. So eli5 : Why can’t lawnmower mufflers work like automotive mufflers?
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Mainly they don’t work as well because they don’t have to. Regulations on auto noise is much more limiting than on lawn equipment. If lawn equipment manufacturers were required to meet a lower decibel level, they would invest in the engineering and materials to meet those requirements.
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