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ORI in 1971 Model Cars - With and Without Lead
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English
Abstract
During 1970-1971, 15 organizations participated in a Coordinating Research Council program to compare the influence of unleaded and leaded gasolines on octane requirement increase (ORI). A total of 147 1971 model cars (47 pairs and 53 individual cars) were operated for 8000-20,000 miles using driving schedules prescribed by each participant One car of each pair was run on an unleaded fuel of 91-95 Research octane number (RON) and the other on a leaded fuel of similar quality. For paired cars, the average ORI was 5.8 RON for unleaded and 3.8 RON for leaded fuel cars. The ORI difference of 2.0 RON for paired cars was slightly less than the average ORI difference of 2.5 RON for all 75 unleaded and 48 leaded cars. In a supplemental program, results in 20 cars showed an average ORI difference of only 0.3 RON between unleaded and low-lead fuel cars.
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Citation
Bigley, H. and Benson, J., "ORI in 1971 Model Cars - With and Without Lead," SAE Technical Paper 730013, 1973, https://doi.org/10.4271/730013.Also In
References
- “Influence of Leaded and Unleaded Fuels on Octane Requirement Increase in 1971 Model Cars-Phase I: 1970-71 CRC Road Rating Program.” Coordinating Research Council Report No. 451 September 1972
- “Influence of Leaded and Unleaded Fuels on Octane Requirement Increase in 1971 Model Cars: 20-Car Pilot Program at Southwest Research Institute.” Coordinating Research Council Report No. 445 March 1971
- Bigley, H. A. Jr. Keller B. D. Kloppe M. G. “Octane Requirement Increase in 1971 Model Cars with Leaded and Unleaded Gasolines.” Paper 710675 SAE National West Coast Meeting Vancouver August 1971
- Brinegar C. S. Miller R. R. “Statistical Estimation of the Gasoline Octane Number Requirement of New Model Automobiles.” Technometrics 3 1 February 1960
- “CRC Octane Number Requirement Survey, 1971.” CRC Report No. 448 November 1971