This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Mechanism of Induction System Deposit Formation
Annotation ability available
Sector:
Language:
English
Abstract
Basic information on gasolines which cause damaging induction system (intake port and valve) deposits in ground vehicle engines was obtained. Several fuels of known depositing tendencies were charcoal filtered and the absorbant extracted with chloroform and acetone. The adsorbant was then eluted with isopropyl alcohol in a silica gel column to obtain a concentrate. This concentrate was further subdivided in a column of magnesium silicate by a repeated elution sequence using n-pentane and methanol, obtaining a 97% all inclusive induction system deposit extract -- representing about 10-500 ppm of the fuel. The results were confirmed by both bench and engine tests. An identification of these induction system deposit precursors was made by means of elemental, nuclear magnetic resonance, infrared and mass spectral analyses.
The induction system deposit precursors were found to consist primarily of long chain oxygen and nitrogen containing compounds such as amides and carboxylic acids. Representative samples of these compounds were purchased or synthesized and their induction system deposit tendencies determined. Electron spin resonance experiments were conducted which showed that the conversion of the induction system deposit precursors to induction system deposits is a free radical reaction. The induction system deposits were analyzed, and their chemical composition determined. Finally, the mechanism of induction system deposit formation in terms of its chemistry was formulated.
Authors
Topic
Citation
Dimitroff, E. and Johnston, A., "Mechanism of Induction System Deposit Formation," SAE Technical Paper 660784, 1966, https://doi.org/10.4271/660784.Also In
References
- “Storage Stability of Gasolines.” 1964
- “Separation and Characterization of Polar Material in Distillate Fuel.” 1963
- “Fundamentals of Fuel Stability.” July 1961
- “Fundamentals of Fuel Stability.” Stanford Research Institute Final Report Jan. 15 1961
- Scheule H. J. “Fuel Factors Influencing Intake Deposition.” Automotive Industries Oct. 1 1956 54 58 122 128
- Johnston A. A. Dimitroff E. “A Bench Technique for Evaluating the Induction System Deposit Tendencies of Motor Gasolines.” Paper 660783 , SAE Transactions 75 1967 885 891