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Diesel sounds...

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I was wondering about th low-pitched whiny-whistly noise that diesels make. What causes it? Even the littl VW TDIs make the noise.

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in modern times yes.

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Yeah, the sound is from the turbocharger spooling up and forcing air into the engine to get extra power, that's why most 18-wheelers you hear running around don't really make a lot of noise, they just kinda hiss as they go by you because all in all, a diesel at rpm is actually pretty quiet, its during idle, acceleration and deceleration that they're noticeable because the turbo stops spooling the extra power in.

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