Accession Number:

AD0706190

Title:

THE PROBLEM OF SELECTING LUBRICATING OILS FOR ENGINES WITH VARIOUS LEVELS OF STRESS,

Descriptive Note:

Corporate Author:

FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Report Date:

1970-04-17

Pagination or Media Count:

35.0

Abstract:

The selection of the proper quality of lubricating oil for every individual engine type is a decisive factor in the operating reliability and potential of engines. In making this selection it must be considered that there exists a different optimal viscosity of oil for every individual engine type, assuring minimum wear under given conditions. Thus, e.g. for low-speed diesel engines the optimal viscosity is 45-70 centistokes at 50 degrees centigrade for high-speed diesel engines, 75-120 centistokes at 50 degrees centigrade or correspondingly 10-15 centistokes at 100 degrees centigrade for highly supercharged engines, 20-25 centistokes at 100 degrees centigrade. However, in addition to viscosity, other factors too affect the suitability of various oils the sulfur content and the thermal stress in the engine. Since pistons and, particularly, the piston rings represent the most thermally stressed regions of the engine, it is logical to classify engines into groups with pistons of similar design liable to similar magnitudes of thermal stress. This thermal stress is conditioned by the heat transfer between the gases and the piston bottom. Author

Subject Categories:

  • Lubricants and Hydraulic Fluids
  • Marine Engineering
  • Reciprocating and Rotating Engines

Distribution Statement:

APPROVED FOR PUBLIC RELEASE