1996-10-01

Repeatability of Intake Valve Deposit Measurements in the CRC 2.3L Ford Intake Valve Deposit Dynamometer Test 962011

Recently, the Coordinating Research Council (CRC) developed an engine dynamometer test based on a 1994, 2 3 liter, Ford engine to determine the intake valve deposit (IVD) forming tendency of fuels. During the development of this test, an Inter-Laboratory Study (ILS) was conducted using Draft 3 I of the “Standard Dynamometer Test Method for Measuring the Detergency of Spark Ignition Engine Fuels”. This paper describes a data set which was generated by running tests with a variety of fuels, including many repeat tests, using this procedure to obtain intake valve deposit data. This data, combined with the ILS data and data from Phase II-B of the CRC test development, points out the variation in test to test repeatability as a function of the average intake valve deposit weight of a given fuel. Analysis shows that base fuels, not containing detergent additives, have a repeatability which varies differently than fuels which do contain detergent additives and that this repeatability is typically better than fuels which contain detergent additives. Additionally, the data indicates that within a test, the intake valve in cylinder 3 typically produced heavier IVD, while the intake valves in cylinders 1 and 4 typically produced less IVD. Information is also presented and discussed regarding the variation between intake valves within a test and comparing IVD weight to standardized CRC intake valve ratings.

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