Counterflow cylinder head

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Cylinder head of an older four-cylinder two-valve four-stroke gasoline engine.

The counterflow cylinder head is a type of cylinder head in which the intake and exhaust ports are on the same side. Compared to the cross-flow cylinder head commonly used today , this design has the following properties:

Advantages:

  • narrower design of the motor (the smaller space requirement is mainly of interest for transversely installed motors)
  • Intake and exhaust manifold can be attached with the same screws (cost savings)
  • The heat transfer favors the complete gasification of the gasoline and helps to prevent carburetor icing ( irrelevant for engines with manifold injection )
  • Short gas paths, therefore well suited for charging

Disadvantage:

  • The unnecessary heating of the intake air results in poorer filling (loss of performance) and a higher tendency to knock
  • Only suitable for conventional two-valve technology ( multi-valve technology and thus better gas exchange is not possible)
  • Increased fire risk in the event of fuel leaks (the intake tract is directly above the exhaust manifold)

literature

  • Alfred Böge (Hrsg.): Vieweg Handbook Mechanical Engineering Basics and Applications of Mechanical Engineering Technology, 18th edition, Springer, 2007, ISBN 978-3-8348-0110-4 , p. L 69 (985).
  • Bosch (Hrsg.): Krafahrtechnisches Taschenbuch, 25th edition, Springer, Wiesbaden, 2003, ISBN 978-3-528-23876-6 , p. 467.