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Road Rating Trends of United States Motor Cars - A Review of Recent CRC Programs
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English
Abstract
A review of the CRC road rating programs conducted between 1952 and 1971 indicates that:
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1.
Equations based on RON and MON are satisfactory for predicting the road octane numbers of gasolines.
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2.
MON has become more important and RON less important in prediction equations.
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3.
Variables such as percent aromatics, Pb concentration, and DON are not broadly significant and improve RON/MON equation predictions only in restricted applications.
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4.
Car appreciation of low-sensitivity fuels has increased, while appreciation of high-sensitivity fuels has decreased.
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5.
Road octane response to increase in laboratory octane quality has decreased.
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6.
Variability of Road octane testing and predictions have remained substantially constant over the past 20 years.
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7.
Because of variability considerations, measurements of road versus laboratory octane relationships and estimates of car satisfaction are subject to significant errors.
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Citation
Bailey, B., Forster, E., and Morris, W., "Road Rating Trends of United States Motor Cars - A Review of Recent CRC Programs," SAE Technical Paper 730012, 1973, https://doi.org/10.4271/730012.Also In
References
- Corner E. S. “Octanes from Laboratory-to-Road.” Paper 777 presented at SAE Summer Meeting Atlantic City June 1956
- McGuire W. J. Sorensen E. Buerstetta F. D. Healy W. C. “Practical Design of Better Fuels.” Presented at API Div. of Refining Meeting Montreal May 1956
- Morris W. E. “Correlations Between Road Octanes, Laboratory Octanes, and Hydrocarbon Type.” Paper 261 presented at SAE National Fuels and Lubricants Meeting, Cleveland November 1957
- Annual Review of Gasoline Quality Ethyl Corp. Detroit
- Road Octane Survey E. I. duPont de Nemours & Co., Inc. Wilmington, Del
- Morris W. E. “Engine-Octane Quality Relationships-State of the Art.” Presented at 37th Midyear Meeting API Div. of Refining New York May 9 1972
- Forster E. J. Unzelman G. H. Stinson L. E. “Background For Balancing Antiknocks, Hydrocarbons and Octane Requirements.” Presented at 37th Midyear Meeting API Div. of Refining New York May 9 1972
- Analysis of 1963 Road Rating Data, Regular Grade Fuels and Cars, CRC Report CM-51-63
- Analysis of 1966 Road Rating Data, Premium Grade Fuels and Cars, CRC Report No. CM-62-66
- Analysis of 1967-68 Road Rating Program, Premium Grade Fuels and Cars-Phase I, CRC Report No. 444
- Analysis of 1969 Road Rating Data, Regular Grade Fuels and Cars, CRC Report No. CM-75-69
- Analysis of 1970-71 Road Rating Data, Unleaded Gasolines in 1971 Cars, Phase II, Report CM-79-71
- Analysis of 1964 Road Rating Data, Premium Grade Fuels and Cars, CRC Report No. CM-54-64