Furthermore, the stem shape and tapering of the small end reduced connecting rod mass.
Furthermore, the connecting rod bearings were made from a copper-based alloy.
While the cylinder block had an open-deck design, Subaru claimed that lowering the water jacket achieved the same block stiffness as a semi-closed structure.
Furthermore, roller lifters were used as contacts between the pump and camshafts to reduce friction; a pulsating damper was also integrated in the pump to reduce fuel pressure fluctuations.