Crankcases in Focus

  • As the housing for the drive mechanism and cooling jacket, the crankcase forms the central component of the engine.
  • The crankcase has a number of functions and tasks, including:
    • - Accommodating the crank drive mechanism
    • Accommodating and connecting the cylinder head(s)
    • As a mounting for the crankshaft and, if applicable, the camshaft
    • Accommodating lubricant and coolant ducts
    • Integrating a crankcase ventilation system
    • Connecting to the gearbox and valve control drive
    • Accommodating various auxiliary components
    • Closing the crankcase to the outside by means of the oil pan.
  • BF crankcases are produced primarily from grey cast iron by sandcasting.


1 Cylinder head sealing surface
2 Support for cylinder liner
3 Openings for valve push rods
4 Tapped holes for cylinder head bolts


Crankcases for in-line engines


  • Balanced engine running, even without mass balancing.
  • Straightforward, cost-effective construction method.


  • Longer construction method when compared to comparable V engines.

Crankcases for V engines


  • Shorter and more compact model when compared to comparable in-line engines.
  • Shorter model for crankshafts and camshafts.


  • More cost-intensive construction method.
  • Takes up more space (width).