Tuesday, April 21, 2020

Reason for max linear wear on top and near scavenge ports

Reasons for maximum wear at top of the stroke being:
  • The gas load behind the ring is maximum  
  • It is the hottest region  
  • Viscosity of oil film is low and liable to breakdown under heavy load and high temperature  
  • Abrupt Change in direction of piston rings, at dead ends of reciprocating motion. 
  • Corrosive wear  
  • More liable to be attacked by acids.

Reason of maximum wear around the ports.
  • Due to leakage of hot gases past the top ring into the ports and these hot gases will tend to burn off the oil film.

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