"scott" <sco### [at] scottcom> wrote:
> Maybe someone could find a way to convert the sound energy from an engine
> into mechanical or electrical energy...

Some do, in a way: Resonance exhausts. They're designed to use the acoustic
"bang" produced when a cylinder is opened to expel the exhaust gases, to
resonate in the exhaust system in such a way that a lower-than-average pressure
is achieved when the next cylinder opens, helping expel it.

Probably must be tuned to some certain rpm optimum though.

So that may be another reason why racing cars are particularly loud - and why
the statement "loud == inefficient" is not totally true.

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