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Interesting. But most implementations/vendors listed in article are for motorcycles. But why i don't hear about it being used for cars? Precision controlling engine variable valve timing seems to me by magnitude harder task then simplest valve on exhaust tube. Vendors even play with dynamic aerodynamics like deployable wing at speed. But where are exhaust valves in common cars? I heard about them at car exhausts only in context of changing sound/noise, not optimization for rpms. :/
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