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With the objective of further enhancing the engine performance of the Acura brand and the environmental performance of the Honda brand in relation to the North American market, where there is a need for powertrains with driving force margin for SUVs and pickup trucks, Honda has developed a 3.0 L turbocharged engine and a 3.5 L naturally aspirated engine. Both engines adopt the same newly developed valvetrain structure and share main engine geometries. These newly developed engines are equipped with a compact new valvetrain structure combining Hydraulic Lash Adjusters and roller rocker arms with a valve-lifter based Variable Cylinder Management system which has an internalized switching mechanism. This newly developed valvetrain made it possible to incorporate dual overhead cam structure without enlarging the cylinder head shape relative to the single overhead cam structure.

A 3.5-L natural aspiration engine was developed to enhance the environmental performance of V6 engines to be used in Honda’s North American market. This engine changes from the single overhead cam architecture for the cylinder head found in the previous engine to a double overhead cam architecture and adopted variable timing control intake and exhaust variable cylinder management for the valve system. This increased the degree of freedom in setting valve timing across the operating range compared to the past, increased the intake air volume in the high-load range, and realized reduction of pumping loss under low and medium load. The intake port, combustion chamber, and piston shape related to combustion have been newly designed to enhance in-cylinder flow. In addition, while following the cooling structure of previous engine, water channels were installed between the exhaust valves and between the cylinder bores to enhance the cooling performance of the combustion chamber.