Fig 5 Gaseous Emissions Results at 2000 RPM Showing Effect of LHR Engine Operation

The gaseous emissions results at 2000 rpm are shown in Fig. 5. In general, insulating the engine and then increasing the coolant temperature reduced the HC emissions across the load range while slightly reducing the CO emissions at part-load. The CO emissions increased at the full-load condition. The NOx emissions for the Baseline Ceramic engine were the same as the baseline metal engine at low load and were slightly reduced at the full load condition. The NOx emissions for the hot ceramic engine compared to" the baseline metal engine were increased at part-load and reduced at the full-load condition. The NOx emissions were higher across the entire load range for the advanced fuel injection timing. The NOx emissions were significantly reduced at retarded, fuel injection timings but only at the expense of increased particulate emissions as shown in Fig. 4. The tradeoff between the particulate and NOx emissions for the three fuel injection timings is shown in Fig.' 6.

Fig. 6 is a plot of particulates and ISFC versus NOx emissions for the Hot Ceramic engine at 2000 rpm full load.

INSULATED ENGINE 2000' RPM, FULL LOAD

INJECTION TIMING 6" RETARDED

Fig. 6 is a plot of particulates and ISFC versus NOx emissions for the Hot Ceramic engine at 2000 rpm full load.

INSULATED ENGINE 2000' RPM, FULL LOAD

INJECTION TIMING 6" RETARDED

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