A dynamometer-mounted four-cylinder Saturn engine was used to accumulate combustion chamber deposits (CCD), using an additized fuel. During each deposit accumulation test, the HC emissions were continuously measured. The deposit thickness at the center of the piston was measured at the beginning of each day. After the 50 and 35-hour tests, HC emissions were measured with isooctane, benzene, toluene, and xylene, with the deposited engine, and again after the deposits had been cleaned from the engine.The HC emissions showed a rapid rise in the first 10 to 15 hours and stabilization after about 25 hours of deposit accumulation. The HC increase due to CCD accumulation accounted for 10 to 20% of the total engine-out HC emissions from the deposit build-up fuel and 10 to 30% from benzene, isooctane, toluene, and xylene, making CCDs a significant HC emissions source from this engine. The HC emissions stabilized long before the deposit thickness.The deposit pore size distribution was determined using mercury porosimetry and optical microscope examination. It was determined that the deposit pores acting as crevices similar to piston top and cylinder head crevices, was the major mechanism for fuel storage. In addition, the contribution of piston top deposits to the total HC emissions was much less than that of the cylinder head deposits.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Combustion Chamber Deposit Effects on Hydrocarbon Emissions from a Spark-Ignition Engine


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    International Fuels & Lubricants Meeting & Exposition ; 1997



    Publication date :

    1997-10-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Combustion chamber deposit effects on hydrocarbon emissions from a spark-ignition engine

    Haidar,H.A. / Heywood,J.B. / Massachusetts Inst.of Technology,Cambridge,US | Automotive engineering | 1997


    Spark ignition engine combustion chamber deposits and their effects upon emissions

    Lee,R. / Equilon Enterprises LLC,GB | Automotive engineering | 1999


    An Experimental Study of Fuel Composition and Combustion Chamber Deposit Effects on Emissions from a Spark Ignition Engine

    Fry, Jeffrey H. / Harpster, Michael O. / Matas, Scott E. et al. | SAE Technical Papers | 1995



    Direct Injection Spark Ignition Engine Deposit Analysis: Combustion Chamber and Intake Valve Deposits

    Parsinejad, F. / Biggs, W. / Society of Automotive Engineers | British Library Conference Proceedings | 2011