Quote:
Originally Posted by GreenSquirrel
Some of the latest gen Corvette's (C7) have butterfly valves in the exhaust, the Ferrari 458 has an additional exhaust chamber that is opened at full chat. I also thought of a dilating cone type valve like on the exhaust of a fighter jet, very exotic and would need to be designed properly so as not to jam up from road crud, but I have been tooling with metal from soda cans to create a prototype, seems feasible using a simple cable linkage and return spring.
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Check out this link.It's for the Me 262,Junkers JUMO 004 turbojet tailpipe bullet valve.These are also used in Pelton Wheel turbine water jets.
They're the most fluid dynamically efficient restriction valving I've ever seen and basis for the grille block on my truck.
http://greyfalcon.us/jumo.jpg