Valvular-conduit exhaust manifold

A valvular-conduit exhaust manifold for an intermittent-combustion internal combustion engine, the valvular-conduit exhaust manifold comprising:

• a. a plurality of fluid-conduit runner portions, wherein each fluid-conduit runner portion of said plurality of fluid-conduit runner portions provides for receiving exhaust gases from a corresponding separate exhaust port of said intermittent-combustion internal combustion engine;
• b. a collector, wherein said collector comprises a fluid conduit having a plurality of collector inlet ports and an outlet port;
• c. a plurality of collector-inlet interface structures, each operatively coupled to, and in fluid communication with, a corresponding said fluid-conduit runner portion for directing said exhaust gases from said corresponding said fluid-conduit runner portion into said collector in a direction substantially towards said outlet port of said collector, wherein at least one collector-inlet interface structure of said plurality of collector-inlet interface structures comprises:
• i. a branch inlet portion operatively coupled to, and in fluid communication with, a corresponding said corresponding said fluid-conduit runner portion;
• ii. a main inlet portion;
• and
• iii. an outlet portion, wherein said main inlet portion is in fluid communication with said outlet portion via a fluid conduit portion of said at least one collector-inlet interface structure defining a corresponding portion of said fluid conduit of said collector, said branch inlet portion is in fluid communication with said outlet portion via a corresponding collector inlet port of said plurality of collector inlet ports, said at least one collector-inlet interface structure provides for said collector to receive said exhaust gases from said corresponding separate exhaust port of said intermittent-combustion internal combustion engine via said corresponding said fluid-conduit runner portion through said corresponding collector inlet port, said branch inlet portion is oriented relative to said collector so as to provide for discharging said exhaust gases received from said corresponding said fluid-conduit runner portion in a direction that is substantially towards said outlet port of said collector, and said corresponding collector inlet port is at least partially bounded by a relatively-sharp-edged junction with said fluid conduit;
• and
• d. at least one fluidic-diode element, wherein said at least one fluidic-diode element is located within, along, and in series with said collector so as to define a corresponding portion of said fluid conduit of said collector through which said exhaust gases can flow, said at least one fluidic-diode element is located either coincident with, or downstream of, said corresponding collector inlet port relative to a direction of flow through said collector towards said outlet port thereof, and said at least one fluidic-diode element is shaped so as to present a relatively-higher coefficient of discharge for said exhaust gases flowing towards said outlet port of said collector, and to present a relatively-lower said coefficient of discharge for said exhaust gases flowing in a relatively-reverse direction therethrough.