Air intake flow device for internal combustion engine

An air intake flow device for manipulating airflow passing through an air passage of an internal combustion engine, the air passage having a cylindrical wall, the device comprising:

• an outer cylindrical skirt sized to abut the cylindrical wall of the air entry passage;
• a plurality of vanes symmetrically arranged extending radially inward from said skirt, the vanes extending only partway toward a center axis of the passage, wherein each of said vanes comprises a generally planar triangular shape, with a first side disposed against the outer cylindrical wall, a second side disposed facing upstream into the airflow, and a third side facing downstream of the airflow,
• wherein said second side and said third side of said vane intersect to form a rounded corner.

A flow device for manipulating flow of fluid passing through a cylindrical passage of an internal combustion engine, the device comprising:

• a plurality of flat planar vanes spaced about an inside periphery of the passage and extending radially inward;
• wherein the vanes extend only partway into the passage leaving a central opening within the passage clear of any vanes, wherein each vane is slanted at a positive angle Φ to direction of the fluid flow such that the vanes in combination create a swirling or vortex action in the passage, and wherein each vane comprising a leading edge tilted downstream from its radially outermost to its radially innermost position and a trailing edge having a generally convex shape.