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

4 Answers

Anonymous 0 Comments

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

Anonymous 0 Comments

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

Anonymous 0 Comments

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

Anonymous 0 Comments

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.