Oil Transport and Consumption

RINGPAK’s oil transport calculations utilise models for the two key effects known to act upon the system.

The ring/liner oil transport model simulates the oil scraping action of the piston rings. It includes the effects of areas of non-conformance, liner honing, ring-liner clearance, axial gas pressure differences and ring end gap size. Oil accumulation at the leading edges of the rings is also calculated.

The oil sweep model simulates the oil transport along the crown surface. Oil attached to the crown surface is exposed to high forces due to piston acceleration and gas flow velocities. The solver analyses the effects of gas flow intensity, oil entrainment into flowing gas and oil accumulation on crown lands and grooves.

Results from the oil transport models are used in the determination of oil flooded areas where hydrodynamic pressure is developed.

Key Features

  • Oil transport modes
    - Ring/Liner clearance
    - End gap
    - Liner hone
    - Ring non-conformance areas
  • Types of lubricant oil consumption (LOC)
    - Oil throw-off into combustion area
    - Oil entrainment of oil droplets into combustion area
    - Oil evaporation from liner surface exposed to hot cylinder gas


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