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Coordinating Research Council Development of a CRC Intake Valve Deposit Test
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Abstract
The Coordinating Research Council (CRC) Intake Valve Deposit Group is evaluating a dynamometer based test to rank fuels for their relative tendency to form intake valve deposits. The Ford 2.3L OHC, dual spark plug equipped engine was previously selected (1*) for use in the current test program to determine optimum test conditions.
A fifteen test design of experiments was constructed to reproduce intake valve deposit weight and morphology, representative of that causing field driveability problems. Test results were analyzed and a two-mode composite test was deduced from deposit weights, visual ratings, observations on the test valves and thermogravimetric analysis (TGA) results.
Once the test was optimized, an additional ten test matrix was conducted to assess both repeatability and the performance of the test over a range of deposit levels. Base fuel and base fuel + two additive combinations were tested to provide a range of deposit tendencies.
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Authors
Citation
Bannon, S., Avery, N., Bitting, W., Carlson, C. et al., "Coordinating Research Council Development of a CRC Intake Valve Deposit Test," SAE Technical Paper 940348, 1994, https://doi.org/10.4271/940348.Also In
References
- Bannon, Scherer, Swaynos “Selection of an Engine Standard for Development of a CRC Intake Valve Deposit Test SAE Paper No. 922260
- Bitting, Gschwendtner Kohlhepp, Kothe, Testroet Ziwica “Intake Valve Deposits - Fuel Detergency Requirements Revisited,” SAE Paper No. 872117 1987
- Coordinating Research Council “Proceedings of the CRC Workshop on Intake Valve Deposits, August 22-24, 1989,” 1989
- Esaki, lshigurao, Suzuki Nakada “Mechanism of Intake Valve Deposit Formation - Part I -- Characterization of Deposits,” SAE Paper No. 900151
- Cheng “The Physical Parameters that Influence Deposit Formation on an Intake Valve,” SAE Paper No. 922257
- Coordinating Research Council “Carburetor & Induction System Rating Manual,” CRC Manual No. 16 1987
- American Society for Testing and Materials - ASTM E1139 “Standard Test Method for Compositional Analysis by Thermogravimetry,” Annual Book of ASTM Standards 14.02 1992
- American Society for Testing and Materials - ASTM E178-80 “Standard Practice for Dealing with Outlying Observations.”
- International Standards Organization - ISO 4259 “Petroleum Products - Determination and Application of Precision Data in Relation to Methods of Test.”