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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Most of the noise isn’t from the exhaust, it’s directly through the block or cylinder head on a small air cooled engine. You can see some experiments on YouTube.
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