ENGINE UNIT

Info Added 2017-04-18


  1. CONSTRUCTION


    1. The cylinder head 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, has a pentroof-type construction and has the spark plug located in the center of the combustion chamber with its electrode facing an area of high combustion stability to enhance knock resistance and combustion efficiency.

    3. The exhaust ports are of Siamese construction and their shape has been optimized, and the diameter of the valves has been increased. By setting the valve angle at 29 degrees, both compactness and intake efficiency have been achieved. Also, the intake port is of a shape that generates a strong tumble flow.

    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 realized.

    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. 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.

      A001LHJC02
      *a Exhaust Port *b Intake Port
      *c Taper Squish *d Exhaust Side
      *e Intake Side *f Ground Electrode
      *g Cylinder Head Sub-assembly Bottom View *h Spark Plug Bottom View
      B003XBC Flow Direction B003XCL Area of High Combustion Stability
      B003XAT Port Shape - -