ENGINE UNIT


  1. CONSTRUCTION


    1. The cylinder head sub-assembly 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, contains a pentroof-type combustion chamber. The spark plug is located in the center of the combustion chamber in order to improve the engine's anti-knocking performance.

    3. The angle of the intake and exhaust valves has been narrowed and set at 23.3° to permit a compact cylinder head sub-assembly.

    4. Thin-electrode type spark plugs with a 12 mm (0.472 in.) diameter threaded base are used in order to make it possible to increase the diameter of the intake and exhaust valves. As a result, improved intake and exhaust efficiency has been achieved.

    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.

      A00XRU2C02
      *1 Camshaft Housing Sub-assembly *2 Cylinder Head Sub-assembly
      *a 23.3° *b Taper Squish

    6. Siamese type intake ports are used to reduce the overall surface area of the intake port walls. This helps prevent fuel from adhering to the intake port walls, thus reducing HC exhaust emissions.

      A00XR6ZC02
      *a Siamese Type *b Independent Type