ENGINE UNIT


  1. CONSTRUCTION


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

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

    3. The intake ports are on the inside and the exhaust ports on the outside of the left and right banks respectively.

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

    5. Siamese type intake ports are used to reduce the overall surface area of the intake port walls. This reduces the amount of fuel adhering to the intake port walls, thus reducing HC exhaust emissions.

      A00263VC02
      *1 Camshaft Bearing Cap *2 Camshaft Housing Sub-assembly RH
      *3 Camshaft Housing Sub-assembly LH *4 Cylinder Head Sub-assembly
      *5 Cylinder Head LH *6 Intake Valve
      *7 Exhaust Valve *8 Camshaft Housing
      *a Intake Side *b Exhaust Side
      *c Taper Squish Area *d View from Bottom
      *e Spark Plug Hole *f Upright Intake Port
      *g A-A Cross Section - -

      Tech Tips

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

      A0025ZRC02
      *a Siamese Type *b Independent Type