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During the three years 1966 through 1968, a Norwegian large bore research project was carried out as a co-operative undertaking with research personnel from The Institute of Internal Combustion Engines and The Institute of Marine Engineering, both of the Technical University of Norway, Det Norske Veritas, Research Department, and The Ship Research Institute of Norway (SFI). The work was centered round problems encountered in thermally loaded components, and included among other things 19 series of shipboard measurements on nine engines. This work has continued in several areas, making use of the vast amount of data and know-how from the previous project. The object of this paper is to present selected results from various but interrelated fields of activity in the hope that the findings and methods might prove of interest and practical value outside the research milieu in Trondheim. Thermal loading is a problem both for those who are responsible for engine design and for engine operation. It is therefore important both for component design and monitoring of engine condition, to have sufficient knowledge of existing or anticipated temperature distribution and heat flux in components, and also to have concept of how these are influenced by engine output, engine speed, scavenging air pressure and temperature etc.