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Convective and radiative heat transfer measurements in a direct injection Diesel engine have been made using surface thermocouples and a pyroelectric radiation detector. Measured instantaneous local and spatially averaged convective heat fluxes agree with correlations for turbulent convection to flat surfaces, when using measured local air motion data. Two temperature zones were considered in the computation of local heat flux. Radiative heat flux measurements corroborate the findings of others, but lower flux levels are attributed to the high swirl engine used here. A proposal for computation of radiative heat flux from soot concentration shows promise.