The test procedures used to investigate the transient warm-up of two Ford 40 kW SI engines are described. Water, engine casing and lubricating oil temperatures were monitored and the rates of temperature rise determined as a function of engine speed and power. The temperature results showed that for both engines the lubricating oil was the slowest component in the warm-up and may be the limiting factor in engine warm-up. A particular emphasis has been placed on monitoring the gas composition during the warm-up. A special feature of this system is the use of two UHC FID analysers operating at 180°C and 2°C. The difference in the two UHC readings is a measure of the high molecular weight condensible UHC or unburnt liquid fuel that is emitted. It is shown that this is quite significant during the initial period of warm-up. NOx emissions showed a strong increase during the warm-up and this indicated that the combustion process took an appreciable time to achieve its maximum flame temperature.


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    Title :

    Transient Heating and Emissions of an SI Engine During the Warm-up Period


    Additional title:

    Sae Technical Papers


    Contributors:
    Ounzain, A. (author) / Andrews, G.E. (author) / Harris, J.R. (author)

    Conference:

    SAE International Congress and Exposition ; 1988



    Publication date :

    1988-02-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Transient heating and emissions of an SI engine during the warm-up period

    Andrew,G.E. / Harris,J.R. / Ounzain,A. et al. | Automotive engineering | 1988




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