Octane Requirement Increase of 1990 and 1991 Model Vehicles
COORDINATING RESEARCH COUNCIL INC ATLANTA GA
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The octane requirement increase ORI of 80 1990 and 43 1991 model-year vehicles operated on commercial fuels in customer-like service has been determined. These ORI values were established from the octane number requirements regardless of whether they were determined at maximum- or part- throttle. At 15,000 miles, the mean ORI of the 1990 vehicles with full-boiling range fuels FBRU was 4.4 RM2 octane numbers, 5.2 Research octane numbers RON, and 3.5 Motor octane numbers MON. The ORI of individual vehicles ranged from no increase to 11.1 R M2 numbers. At 15,000 miles, the mean ORI of the 1991 vehicles with full-boiling range fuels FBRU was 3.3 RM2 numbers, 4.1 RON, and 2.6 MON. Individual vehicle ORI ranged from no increase to 9.2 R M2 numbers. As opposed to a number of 1989 models submitted which showed a somewhat unusual variation with mileage, the 1990 and 1991 models behaved in the more traditional manner.
- Organic Chemistry