A study was made to reduce exhaust emissions and fuel consumption of a general aviation aircraft piston engine by applying known technology. Fourteen promising concepts such as stratified charge combustion chambers, cooling cylinder head improvements, and ignition system changes were evaluated for emission reduction and cost effectiveness. A combination of three concepts, improved fuel injection system, improved cylinder head with exhaust port liners and exhaust air injection was projected as the most cost effective and safe means of meeting the EPA standards for CO, HC and NO. The fuel economy improvement of 4.6% over a typical single engine aircraft flight profile does not though justify the added cost of the three concepts, and significant reductions in fuel consumption must be applied to the cruise mode where most of the fuel is used. The use of exhaust air injection in combination with exhaust port liners reduces exhaust valve stem temperatures which can result in longer valve guide life. The use of exhaust port liners alone can reduce engine cooling air requirements by 11% which is the equivalent of a 1.5% increase in propulsive power. The EPA standards for CO, HC and NO can be met in the IO-520 engine using air injection alone or the Simmonds improved fuel injection system.


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    Title :

    Concepts for reducing exhaust emissions and fuel consumption of the aircraft piston engine


    Contributors:

    Conference:

    Society of Automotive Engineers, Business Aircraft Meeting and Exposition ; 1979 ; Wichita, KS


    Publication date :

    1979-04-01


    Type of media :

    Conference paper


    Type of material :

    No indication


    Language :

    English




    Concepts For Reducing Exhaust Emissions And Fuel Consumption Of The Aircraft Piston Engine

    Rezy, Bernard J. / Tucker, J. Ronald / Meyers, Jay E. et al. | SAE Technical Papers | 1979


    Fuel Consumption and Exhaust Emissions of Aircraft

    Buechler, R. / France; Office national d'etudes et de recherches aerospatiales | British Library Conference Proceedings | 1996