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An increase in the temperature of charge in an engine combustion chamber is now more and more attractive due to its advantages in energy savings and environmental control. However, this will affect the design of engine elements, since a higher temperature will result in considerable thermal stresses and distortion, material and lubricant degradation, or even seizure and scuffing failures. Actually even for currently designed diesel engines, engine piston assembly failure, particularly piston ring/cylinder liner interface failure due to heat accumulation, is a very serious problem. Effective means of carrying heat away from this area are crucial for the prevention of scuffing. However, due to the reciprocal motion of the mechanism, efficient piston cooling is difficult to achieve using conventional cooling methods.