ENGINE UNIT


  1. CONSTRUCTION


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

    2. The cylinder head, which is made of aluminum, contains a pentroof type combustion chamber. The spark plug has been located in the center of the combustion chamber in order to improve the engine's anti-knocking performance.

    3. The port configuration is an efficient cross-flow type in which the intake ports face the inside of the V bank and the exhaust ports face the outside.

    4. 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.

    5. A siamese type intake port is used. The port diameter gradually decreases toward the combustion chamber to optimize the airflow speed and intake pulsation.

      A0009SJC01
      *1 Intake Valve *2 Spark Plug Hole
      *3 Exhaust Valve *4 Camshaft Housing
      *5 Taper Squish - -
      *a A - A Cross Section *b Intake Port
      *c Exhaust Port - -

      Tech Tips

      The difference between a siamese type intake port and an independent type one is shown in the following illustration:

      A0009SHC01
      *A Siamese Type *B Independent Type

    6. An air injection port is provided for the air injection system.

      A0009TZC02
      *1 Cylinder Head RH *2 Air Injection Port
      *a Exhaust Side View A0009RQ Engine Front