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Exhaust NOx and particulate measurements were obtained at equivalent operating conditions in a direct-injection compression ignition engine for diesel and diethyl ether fuel. Particulate levels for diethyl ether were very low relative to the diesel fuel and did not increase significantly until the fuel to oxygen equivalence ratio was above 0.8. The log of fuel specific NOx for both the diesel and diethyl ether fuel were found to correlate well with the inverse of adiabatic flame temperature as has been observed by others in previous research. A newly defined heat release averaged, adiabatic flame temperature improved the correlation of both fuels. Differences in the correlations of the two fuels with this newly defined temperature were smaller than the scatter of the data.