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Mechanism of Intake Valve Deposit Formation Part III: Effects of Gasoline Quality
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Abstract
Quality control of gasoline constituents and its effect on the Intake Valve Deposits (IVD) has become a recent issue.
In this paper, the effects of gasoline and oil quality on intake valve deposits were investigated using an Intake Valve Deposit Test Bench and a Sludge Simulator.
The deposit formation from the gasoline maximized at an intake valve temperature of approximately 160 °C, and the deposits formed from the engine oil were maximum at approximately 250 °C. Therefore, the contribution of the gasoline or the engine oil appears to depend on the engine conditions.
The gasoline which contains MTBE or ethanol with no detergent additive slightly increases the deposition amount. The gasoline with a superior detergent significantly decreases the deposition amount even when MTBE or ethanol is blended in the gasoline.
Appropriate detergent fuel additive retards the oil deterioration. The deterioration degree of the oil in the engine and in the Sludge Simulator have a good correlation with the amount of deposition formed in the Intake Valve Deposit Test Bench.
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Citation
Ohsawa, K., Nomura, Y., Moritani, H., Okada, M. et al., "Mechanism of Intake Valve Deposit Formation Part III: Effects of Gasoline Quality," SAE Technical Paper 922265, 1992, https://doi.org/10.4271/922265.Also In
References
- Esaki, Y. Ishiguro, T. Suzuki, N. Nakada, M. “Mechanism of Intake Valve Deposit Formation Part 1: Characterization of Deposits,” SAE Paper No. 900151 1990
- Bitting, B. H. Ziwica, K. H. Kothe, M. Kohlhepp, W. Testroet, C. J. Gschwendtner, F. “Intake Valve Deposits - Fuel Detergency Requirements Revisited,” SAE Paper No. 872117 1987
- Nomura, Y. Ohsawa, K. Ishiguro, T. Nakada, M. “Mechanism of Intake-Valve Deposit Formation Part 2: Simulation Tests,” SAE Paper No. 900152 1991
- Kawamura, M. Moritani, H. Nakada, M. Oohori, M. “Sludge Formation and Engine Oil Dispersancy Evaluation with a Laboratory Scale Sludge Simulator,” SAE Paper No. 892105 1989