ENGINE UNIT


  1. CONSTRUCTION


    1. By integrating the exhaust manifold into the cylinder head sub-assembly the exhaust gas can be cooled using the water jacket of the cylinder head sub-assembly. This results in enhanced drivability and fuel economy and a reduction of unburned gasoline due to the stoichiometric ratio being closer to ideal.

    2. The shape and location of the water jackets has been optimized to provide space for larger exhaust ports.

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

      A0025YAC01
      *1 Camshaft Bearing Cap *2 Camshaft Housing Sub-assembly
      *3 Camshaft Housing Sub-assembly LH *4 Cylinder Head Sub-assembly
      *5 Cylinder Head LH *6 Intake Valve
      *7 Exhaust Valve - -
      *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 - -
      A0025S1C01
      *a Exhaust Manifold Built into Cylinder Head (Exhaust Port) - -
      A0025ZRC02
      *a Siamese Type *b Independent Type

      Tech Tips

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