I’ve noticed that big, diesel things like locomotives and busses are really loud and shaky when idling but get noticeably quieter when they start to move. Why?
In: 4
Cause you don’t notice it. Inside the can of a big truck, the noise doesn’t go away at higher rpm, and gets much louder than idle. It does sound smoother as it gets faster until it doesn’t. The road and wind noise so help cover up some sounds at speed, but the engine is now moving a bunch more air and it’s not getting any quieter.
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