Volume 17, Issue 3 (May 1989)

    Cetane Number of Small Samples by Engine Throttling: Reliability Comparison with Standard Cooperative Fuels Research Method

    (Received 25 April 1988; accepted 18 October 1988)

    CODEN: JTEOAD

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    Abstract

    The manifold pressure below which a diesel engine starts to misfire is related to the cetane number of the fuel. The method of engine throttling to misfire has been used to determine cetane quality of much smaller quantities of diesel fuel than can be used with the standard ASTM D 613 method. A comparison of reliability has been made between the two methods using identical test samples. The fact that published repeatability limits for ASTM D 613-84 are much smaller than the reproducibility limits suggests that there can be considerable bias at some laboratories using the standard method.

    A method of calibration and computation is presented that provides reliable estimates of the accuracy of misfire pressure results without reference to other laboratories. Confidence intervals determined for the misfire pressure method are consistent with the observed difference in the results determined on the one set of test materials by the two methods. This suggests that, in the procedure for engine throttling to misfire proposed here, the interlaboratory component of error could be small.


    Author Information:

    Johnston, RRM
    CSIRO, Clayton, Victoria

    van der Touw, JW
    CSIRO, Highett, Victoria


    Stock #: JTE11109J

    ISSN: 0090-3973

    DOI: 10.1520/JTE11109J

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    Author
    Title Cetane Number of Small Samples by Engine Throttling: Reliability Comparison with Standard Cooperative Fuels Research Method
    Symposium , 0000-00-00
    Committee D02