Exhaust Emissions Characteristics for a General Aviation Light-Aircraft Teledyne Continental Motors (TCM) GTSIO-520-K Piston Engine.

The Teledyne Continental Motors TCM GTSIO-520-K engine SN220015 was tested at the National Aviation Facilities Experimental Center NAFEC to develop an exhaust emissions data base. This data base consists of current production baseline emissions characteristics, lean-out emissions data, effects of leaning-out the fuel schedule on cylinder head temperatures, and data showing ambient effects on exhaust emissions and cylinder head temperatures. The engine operation with its current full-rich production fuel schedule could not meet the proposed Environmental Protection Agency EPA standard for carbon monoxide CO and unburned hydrocarbons HC under sea level standard-day conditions. The engine did, however, meet the proposed EPA standard for oxides of nitrogen NOx under the same sea level conditions. The results of engine testing under different ambient conditions essentially sea level standard day to sea level hot day are also presented and these results show a trend toward higher levels of emissions output for CO and HC while producing slightly lower levels of NOx. Author