Compact intake manifold with long runners for six-cylinder in-line engines

An intake manifold with inertia charging benefits for six-cylinder in-line engines with:

• a single plenum that is centrally positioned along the longitudinal axis of the manifold, this longitudinal axis paralleling the longitudinal axis of the engine,
• six individually dedicated runners of substantially equal internal cross-section and substantially equal length, each of said runners beginning at a shared singular plenum of defined central location and ending at a designated corresponding individual cylinder intake port of the engine, the interior shape of the runners being substantially rectangular throughout their length and consequently able to share walls between runners to the most advantageous extent, the walls defining the bottom of the intake runners being substantially in the same plane, said plane being generally perpendicular to the longitudinally vertical plane of the engine,
• the end segments of the of the six individual intake runners being arranged in two oppositely disposed sets of three at their point of origin at the plenum, each set of three runner intakes is arranged as to begin generally equidistant from the transverse centerline of the plenum, one set of three runners originating on the longitudinally rearward side of the plenum serving the longitudinally rearward three engine intake ports, one set of three runners originating on the longitudinally forward side of the plenum serving the longitudinally forward three engine intake ports,
• the three runners and their paths on the longitudinally rearward side of the plenum being substantially symmetrical to the three runners and their paths on the longitudinally forward side of the plenum.