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Measurements of instantaneous in-cylinder heat transfer have been performed at a selected location of the cylinder head in a super long stroke, low speed, two-stroke experimental diesel engine operating under various conditions. The temperatures of both the wall and the process have been varied either by locally using titanium instead of steel as wall material or correspondingly by operating the engine with an unusually high equivalence ratio. A standard case with a steel wall and a typical full load point has been used as reference. For all conditions, measurements of the wall temperature very close to the surface of the apparent radiation temperature of the combustion chamber contents and of the gas temperature across the boundary layer (the latter by means of a for this purpose specifically developed fiber-optical sensor) have been carried out. As a result, the total heat flux as well as its two components, convection and radiation, have been determined.