ELI5, Why do some engines, even though they are the same size sound different. For example, a BMW s1000rr has the almost the same engine as a Kawasaki zx10r, but, they sound so different at idle.

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ELI5, Why do some engines, even though they are the same size sound different. For example, a BMW s1000rr has the almost the same engine as a Kawasaki zx10r, but, they sound so different at idle.

In: Engineering
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There are many factors in how an engine sounds. Firing order and interval plays a big roll, bore and stroke differences, intake design and exhaust design. These all make a difference. An engine that fires cylinders 180 degrees apart will sound very different from one that fires 90 degrees apart.

Engine sounds come from a multitude of factors. The sound you actually hear is the valves opening and closing.

You can take 2 identical engines and change the valve timing, and get different sounds.

So while the 2 engines might be similar in spec, the way the Rev, speed they Rev at etc, will dictate what valve timing is needed, and thus change the sound of the engine

A multitude of factors. Exhaust systems and whether or not they’re turbocharged are two examples.

Because at idle you hear the internal mechanical sounds of an engine and a high revs you hear the combustion exhaust note