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A Statistical Review of Available Data Correlating the BMW and Ford Intake Valve Deposit Tests
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Abstract
A 100-hour engine dynamometer test for intake valve deposits (IVD) which uses a Ford 2.3L engine was developed by the Coordinating Research Council (CRC). Recently, this test has been approved by the American Society for Testing and Materials (ASTM) as Test Method D 6201-97. Since this test offers improvements in test variability, duration, and cost, it is expected to replace ASTM D 5500-94, a 16,000-km vehicle test run using a BMW 318i, as the key performance test for the Certification of Gasoline Deposit Control Additives by the EPA Final Rule.
As a step in the replacement process, a correlation between valve deposit levels for the CRC 2.3L Ford IVD test and ASTM D 5500 BMW IVD test must be determined. This paper provides a statistical review of available data in an attempt to provide such a correlation. Data used include BMW and Ford IVD data on 21 different fuels from three major sources: A CRC interlaboratory study (ILS), data provided by oil and additive companies, and a set of data provided by members of the Chemical Manufacturers Association (CMA).
Considering the inherent weaknesses of the data set, the most appropriate correlation is achieved using a functional fit technique on natural logarithm transformed data. The model developed shows that, based on all the available data, a true 100 mg/valve BMW result is equivalent to a 135 mg/valve CRC Ford 2.3L result, with confidence limits ranging from 106 to 171 mg/valve. Issues relating to the correspondence of the two tests for all fuels and additives are also discussed.
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Citation
Crosby, T., Ahmadi, M., Schiferl, E., Arters, D. et al., "A Statistical Review of Available Data Correlating the BMW and Ford Intake Valve Deposit Tests," SAE Technical Paper 981365, 1998, https://doi.org/10.4271/981365.Also In
References
- Bitting, B. Gschwendtner, F. Kohlepp, W. Kothe, M. Testroet, C.J. Ziwica, K.H. “Intake Valve Deposits - Fuel Detergency Requirements Revisited,” SAE Paper No. 872117
- California Air Resources Board “Required Additives in Gasoline,” California Code of Regulations
- “Standard Test Method for Vehicle Evaluation of Unleaded Automotive Spark-Ignition Fuel for Intake Valve Deposit Formation,” 5.03 American Society for Testing and Materials Conshohocken, PA 1996
- U.S. Environmental Protection Agency, Office of Mobil Sources “Final Rulemaking (Interim Requirements): Certification Standards for Deposit Control Gasoline Additives,” 59 210 11 1 94
- U.S. Environmental Protection Agency, Office of Mobil Sources “Final Rule: Certification Standards for Deposit Control Gasoline Additives,” 61 130 7 5 96
- Proceedings of the CRC Workshop on Intake Valve Deposits San Francisco, California August 1989 Coordinating Research Council, Inc. Atlanta, Georgia
- Bannon, S.A. Scherer, G.O. Swaynos, D.V. “Selection of an Engine Standard for Development of a CRC Intake Valve Deposit Test,” SAE Paper No. 922260
- Bannon, S. Avery, N.L. Bitting, W.H. Carlson, C.A. Daly, D.T. Fuentes Afflick, P. Schoppe, D.R. Swaynos, D.V. “Coordinating Research Council Development of a CRC Intake Valve Deposit Test,” SAE Paper No. 940348
- Arters, D. C. Schiferl, E. A. Daly, D. T. “Variability of Intake Valve Deposit Measurements in the BMW Vehicle Intake Valve Deposit Test,” SAE Paper No. 971723
- Corkwell, K.C. Firmstone, G. P. “Repeatability of Intake Valve Deposit Measurements in the CRC 2.3L Ford Intake Valve Deposit Dynamometer Test,” SAE Paper No. 962011
- “Test Method for Dynamometer Evaluation of Unleaded Spark-Ignition Fuel for Intake Valve Deposit Formation,” 5.03 American Society for Testing and Materials Conshohocken, PA 1998
- Bannon, S. A. Ahmadi, M. Buckingham, J. P. Corkwell, K. Crosby, T. A. Daly, D. T. Richardson, C. Scherer, G. O. Schiferl, E. A. Schoppe, D. Woodyard, M. E. “Coordinating Research Council Ford 2.3L Intake Valve Deposit Test - Interlaboratory Study,” SAE Paper No. 961099
- Draper, N. R. Smith H. “Applied Regression Analysis,” 2nd John Wiley & Sons New York 1981
- Wald, A. “The Fitting of Straight Lines If Both Variables Are Subject to Error,” Annals of Mathematical Statistics 1940 11 284 300
- Belsley, D. A. Kuh, E. Welsch, R. E. “Regression Diagnostics,” John Wiley & Sons New York 1980
- Dolby, G. R. Cormack, R. M. Sinclair, D. F. “On Fitting Bivariate Functional Relationships to Unpaired and Unequally Replicated Data,” Biometrika 1987 74 2 393 9