| 摘要 |
Intake tracts 10, 12, 14 and 16 are connected to a common plenum chamber 18 with a passage 20 for supplying air to all the engine intake ports. The tracts 12 to 16 are arranged to open into the plenum chamber 18 in pairs associated with intake ports of which the intake valve events do not overlap, the ends of each pair of tracts disposed within the plenum chamber 18 being arranged directly facing one another and being separated by a gap 22 which is sufficiently wide to permit air flow between the respective tracts and the common passage 20 but which is sufficiently narrow to couple most of any pressure wave energy emanating from one tract directly into the other tract. An elliptical container (30, Figs. 2 and 3) within the chamber 18 may have the tracts 10 to 16 connected to the container aligned with foci of reflection of sound waves by the container walls to enhance pressure wave coupling. The tracts 10 to 16 may be connected to parallel plates (42, Figs. 4 and 5) having an inlet pipe (46) for air flow between the plates to provide vortex throttling of air flow to the tracts. <IMAGE>
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