ENGINE UNIT


  1. CONSTRUCTION


    1. The cylinder head structure has been simplified by separating the camshaft housing sub-assembly (cam journal portion) from the cylinder head sub-assembly.

    2. The cylinder head sub-assembly, which is made of aluminum, has pentroof-type combustion chambers. The spark plug is located in the center of the combustion chamber in order to improve anti-knocking performance.

    3. The angle of the intake and exhaust valves is narrowed and set at 29° to permit a compact cylinder head sub-assembly.

    4. Upright intake ports are used to achieve intake efficiency.

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

    6. Long nozzle type fuel injector assemblies are installed in the cylinder head sub-assembly to reduce the distance from the fuel injector to intake valve. This helps prevent the fuel from adhering to the intake port walls, reducing HC exhaust emissions.

      A00YYNEC01
      *1 Intake Valve *2 Spark Plug Hole
      *3 Exhaust Valve *4 Camshaft Housing
      *5 Taper Squish - -
      *a View from Bottom Side *b Intake Side
      *c Exhaust Side *d A - A Cross Section

    7. A siamese type intake port is used to reduce the overall surface area of the intake port walls. This prevents the fuel from adhering to the intake port walls, thus reducing HC exhaust emissions.

      A00YYF7C02
      *a Siamese Type *b Independent Type