БЛОК ДВИГАТЕЛЯ


  1. CONSTRUCTION


    1. The cylinder block is made of aluminum alloy.

    2. The cylinder block has a bank angle of 60°, a bank offset of 36.6 mm (1.441 in.) and a bore pitch of 105.5 mm (4.15 in.), resulting in a compact block in its length and width even for its displacement.

    3. Spiny-type liners are used.

    4. Installation bosses of the two knock control sensors are located on the inner side of the left and right banks.

      A019QFEC01
      *1 Knock Control Sensor Boss - -

    5. A water passage is provided between the cylinder bores. By allowing the engine coolant to flow between the cylinder bores, this construction keeps the temperature of the cylinder walls uniform.

      A019QS2C01
      *1 Water Passage - -

    6. The liners are the spiny-type which have been manufactured so that their casting exteriors form large irregular surfaces in order to enhance the adhesion between the liners and the aluminum cylinder block. The enhanced adhesion helps heat dissipation, resulting in a lower overall temperature and heat deformation of the cylinder bores.

    7. The shape of the cross-hatching of the liner surface has been optimized to improve oil retention performance, resulting in reduced friction.

      A019QSTC02
      *1 Cylinder Block *2 Liner
      *3 Irregularly Shaped Outer Casting Surface of Liner - -
      *a Enlarged View of Cross-hatching *b A - A Cross Section

    8. The temperature in the intake side of the cylinder bore tends to be lower. For this reason, a wide cylinder block water jacket spacer covers the cylinder bores in order to suppress the flow of the engine coolant and prevent excessive cooling. On the other hand, the temperature of the exhaust side of the cylinder bore tends to be higher. A cylinder block water jacket spacer covers the lower area of the cylinder bores in order to direct the engine coolant to the upper area of the cylinder bores where the temperature is higher. This makes the temperature around the cylinder bores more uniform. As a result, the viscosity of the engine oil (which lubricates the area between the wall surface of the cylinder bore and the piston) decreases, thus reducing friction between the cylinder bore and the piston.

      A019QDYC03
      *1 Cylinder Block Water Jacket Spacer *2 Water Jacket
      *a Exhaust Side *b Intake Side
      A0009RQ Engine Front - -