Eli5: Why does engine compression braking cause such a loud and deep noise?

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Listening to trucks entering a downhill slope and the engine noise is really loud and I can feel it in my chest – it seems louder than when they are accelerating.?

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Anonymous 0 Comments

This is called a “jake brake”. Technically it’s “unmuffled dynamic engine breaking”. It’s illegal in many cities, because of the noise issue.

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