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A technique was developed for measuring the Laminar Burning Velocity (LBV) of multi-component fuel blends for use in high-performance spark-ignition engines. This technique involves the use of a centrally-ignited spherical combustion chamber, and a complementary analysis code. The technique was validated by examining several single-component fuels, and the computational procedure was extended to handle multi-component fuels without requiring detailed knowledge of their chemical composition. Experiments performed on an instrumented high-speed engine showed good agreement between the observed heat-release rates of the fuels and their predicted ranking based on the measured LBV parameters.

An ASTM Task Force was formed in December, 1976 to develop a Laboratory Engine Dynamometer Deposit and Wear Test. A 2.3 liter, four cylinder engine and an unleaded reference gasoline were selected. Reference oils for which field data were available were obtained from industry. The Task Force defined test support hardware for both engine and test stand. The effect of operating variables on engine deposits was studied. A test procedure, based on correlation with field service, is nearing completion. It is expected that this procedure will be capable of defining lubricant performance in terms of motor oil classifications.