ENGINE UNIT


  1. CONSTRUCTION


    1. The cylinder head structure has been simplified by separating the camshaft housing (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 is narrowed and set at 29° allow for a compact cylinder head.

    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.

    6. Long nozzle type fuel injectors are installed in the cylinder head to reduce the distance from the fuel injector to the intake valve, thus preventing the fuel from adhering to the intake port walls and reducing HC exhaust emissions.

      A001MTZC01
      *1 Intake Valve *2 Spark Plug Hole
      *3 Exhaust Valve *4 Camshaft Housing
      *a View from Bottom Side *b Intake Side
      *c Exhaust Side *d A-A Cross Section
      *e Taper Squish *f 29°

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

      A001MP1C01
      *a Siamese Type *b Independent Type