ENGINE UNIT DETAILS PISTON

  1. CONSTRUCTION

    1. The pistons are made of aluminum alloy.

    2. The piston head portion uses a taper squish shape for enhanced fuel combustion efficiency, as well as a configuration that optimizes tumble flow.

    3. The piston skirt is coated with resin to reduce friction losses.

    4. Low-tension piston rings are used to reduce friction and achieve excellent fuel economy.

    5. The No. 1 compression ring, with a thickness of 1.2 mm (0.0472 in.), is used to maintain rigidity to correspond with the higher in-cylinder pressure caused by the increase in the compression ratio.

    6. The sliding surface of the No. 2 compression ring is chrome plated for improved wear resistance.

    7. The oil ring is a 3-piece type, and use of the oil ring contributes higher reliability and lower friction.

    8. A Diamond Like Carbon (DLC) coating has been applied to the surface of the No. 1 compression ring and oil ring, in order to reduce friction losses.

      W139437C01

      *1

      No. 1 Compression Ring

      *2

      No. 2 Compression Ring

      *3

      Oil Ring

      -

      -

      *a

      Taper Squish Shape

      *b

      Resin Coating

      *c

      DLC Coating

      *d

      Chrome Plating