Diesel combusts at a different rate than petrol causing the louder sound

Why Do Diesel Trucks Sound So Different?

If you are zipping along the freeway in your little Miata—or Prius or Optra or whatever—thoughts of Diesel engines are likely miles off. But then you come across a 34-wheel semi-truck with a Diesel engine that sounds…different from yours. Why is that? Diesel trucks sound different because their engines operate on a higher combustion ratio …

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