ENGINE UNIT


  1. CONSTRUCTION


    1. The crankshaft has 5 journals and 8 balance weights.

    2. The pins and journals have been machined with increased precision and the surface roughness has been minimized to reduce friction.

    3. All pins and journal fillets have been hardened to improve their strength.

      A00YYO4C01
      *1 No. 1 Journal *2 Balance Weight
      *3 No. 5 Journal - -
      *a Journal Fillet *b Oil Hole
      *c Pin Fillet - -

    4. The crankshaft bearings have been optimized in width to reduce friction.

    5. An oil groove is provided on each crankshaft bearing (upper main bearing). The oil groove is deep at the center and is shallow at the edges to reduce the amount of oil that leaks from the crankshaft bearing. As a result, the size of the oil pump is reduced, minimizing friction.

    6. The lining surface of the crankshaft bearing has been micro-grooved to provide an optimal amount of oil clearance. As a result, cold-engine cranking performance has been improved and engine vibrations have been reduced.

      A00YYJQC02
      *1 Upper Main Bearing *2 Lower Main Bearing
      *a Micro-grooved *b Oil Groove
      *c Edge *d Center
      *e Oil Groove Depth - -