Cast or Forged Pistons

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  • Member since
    July 2004
  • From: Spartanburg, SC
  • 1,503 posts
Cast or Forged Pistons
Posted by GP-9_Man11786 on Saturday, September 16, 2023 3:28 PM

Do diesel locomotives use cast or forged pistons and rods in their prime mover? or does it depend on the model or builder. I know in performance cars, forged is preferable to cast.

Modeling the Pennsylvania Railroad in N Scale. 

  • Member since
    April 2007
  • From: Bridgman, MI
  • 283 posts
Posted by bogie_engineer on Sunday, September 17, 2023 10:02 AM

EMD two-stroke diesel engines use cast iron for pistons and steel forgings for rods. Crankshafts are forged. The cylinder block is a welded fabrication made up of forged, cast and rolled steel sections.


  • Member since
    September 2003
  • 21,607 posts
Posted by Overmod on Sunday, September 17, 2023 9:28 PM

There is a discussion of pistons in Kettering's SAE paper on the development of the 567 engine.

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