ENGINE UNIT


  1. CONSTRUCTION


    1. The pistons are made of aluminum alloy.

    2. A compact combustion chamber is provided on top of the piston to achieve stable combustion. Together with the pentroof type combustion chamber of the cylinder head, this achieves a high compression ratio, resulting in both high performance and excellent fuel economy.

    3. A taper squish combustion chamber is used to improve anti-knocking performance and intake efficiency. In addition, engine performance and fuel economy are improved.

    4. In order to reduce weight, cast holes are provided on the bottom of the piston head near the pin bosses as shown in the illustration below.

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

    6. A Physical Vapor Deposition (PVD) coating has been applied to the surface of the No. 1 compression ring and oil ring, in order to improve its wear resistance.

    7. By increasing the machining precision of the cylinder bore diameter in the block, only one size of piston is required.

      A019QSDC01
      *1 No. 1 Compression Ring *2 No. 2 Compression Ring
      *3 Oil Ring - -
      *a Weight Reduction Area *b Taper Squish Shape
      *c Resin Coating *d PVD Coating

      Tech Tips

      The same pistons are used for both right and left banks. When installing a piston, the front mark should face the front of the engine.