Effects of combustion chamber deposit location and composition. [MMT is the antiknock fuel additive methylcyclopentadienylmanganese tricarbonyl]

Conference · Sun Mar 01 04:00:00 EST 1981 · Am. Chem. Soc., Div. Pet. Chem., Prepr.; (United States)

OSTI ID:6545400

Adams, K M; Baker, R E

Combustion chamber deposit samples were taken from two vehicles from an octane requirement increase (ORI) fleet and six vehicles from a three-way catalyst (TWC) durability fleet. This selection allowed a comparison of engine type, driving cycle, and the antiknock fuel additive methycyclopentadienylmanganese tricarbonyl (MMT). Selected samples were characterized by quantitative elemental analyses, emission spectroscopy, and by x-ray diffraction. Results of the study are: (1) combustion chamber deposits consist mainly of carbonaceous material with inorganic compounds from both the fuel and the oil; (2) in most cases the H/C ratio is higher for deposits removed from the end gas region; (3) deposits removed from the exhaust valve are almost entirely inorganic compounds, metal phosphates from the oil and manganese oxide if the fuel contains MMT; (4) the cylinder with the highest octane requirement, and hence the first cylinder to knock, cannot be distinguished from the other cylinders by chemical composition of the deposits; (5) cylinders with high oil consumption could be identified by the high concentration of oil inorganics and low concentration of fuel inorganics compared to the other cylinders; (6) differences in deposit composition were observed between engine families and between driving cycles with the same engine family. The source of these differences is believed to be the engine operating conditions but a specific relation has not been established; (7) Mn/sub 3/O/sub 4/ was present in the deposits when MMT was used in the fuel; and (8) deposit accumulation and stabilization involve more than a single mechanism.

• Research Organization: Ford Motor Co., Dearborn, MI
• OSTI ID: 6545400
• Report Number(s): CONF-810308-(Vol.2)
• Conference Information: Journal Name: Am. Chem. Soc., Div. Pet. Chem., Prepr.; (United States) Journal Volume: 26:2
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
025000 -- Petroleum-- Combustion
33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
ADDITIVES
ALKALINE EARTH METALS
ALUMINIUM
ANTIKNOCK RATINGS
AUTOMOTIVE FUELS
CARBON
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
COHERENT SCATTERING
COMBUSTION
COMBUSTION CHAMBERS
DEPOSITS
DIFFRACTION
ELEMENTS
EMISSION SPECTROSCOPY
ENGINES
FUELS
HEAT ENGINES
HYDROGEN
INTERNAL COMBUSTION ENGINES
IRON
LEAD
LUBRICANTS
LUBRICATING OILS
MAGNESIUM
METALS
NITROGEN
NONMETALS
OILS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
OXIDATION
PETROLEUM PRODUCTS
PHOSPHORUS
QUANTITATIVE CHEMICAL ANALYSIS
SCATTERING
SPECTROSCOPY
SULFUR
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENTS
X-RAY DIFFRACTION
ZINC