ENGINE UNIT


  1. CONSTRUCTION


    1. A high-expansion cycle (Atkinson cycle) is used to improve heat efficiency.

    2. On the intake side, Variable Valve Timing-intelligent by Electric motor (VVT-iE), which optimally controls the intake camshaft to the valve timings according to driving conditions, is used.

    3. On the exhaust side, Variable Valve Timing-intelligent (VVT-i), which optimally controls the exhaust camshaft to the valve timings according to driving conditions, is used.

    4. The No. 1 valve rocker arm sub-assembly is used as a valve mechanism and by achieving size reduction while drastically reducing the amount of friction that occurs between the sliding parts and cams, low fuel consumption is achieved. Also, an oil pressure type valve lash adjuster assembly is used to make valve clearance adjustment unnecessary in consideration of serviceability.

    5. A valve compression spring, whose upper portion is shaped like a beehive, is used to reduce inertial mass. As a result, the load on the valve compression spring and friction are reduced.

    6. The structure of the oil retainer of the valve lash adjuster assembly has been enhanced to achieve a compact and lightweight design.

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      *1 Camshaft Timing Exhaust Gear Assembly *2 Camshaft Timing Gear Assembly
      *3 Exhaust Camshaft *4 Intake Camshaft
      *5 No. 1 Chain Tensioner Assembly *6 Chain Tensioner Slipper
      *7 Chain Sub-assembly *8 Valve Lash Adjuster Assembly
      *9 No. 1 Valve Rocker Arm Sub-assembly *10 Valve Stem Cap
      *11 Valve Spring Retainer Lock *12 Valve Spring Retainer
      *13 Valve Compression Spring *14 Valve Stem Oil Seal
      *15 Valve Spring Seat *16 Valve Guide Bush
      *17 Valve - -

      Figure 1. Valve Timing

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