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Influence of Lubricating Oil Ash on the ORI of Engines Running on Unleaded Fuel
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English
Abstract
The paper gives a survey on the influence of lubricant ashes on octane requirement increase (ORI) at steady-state high speed of a typical engine: the 125 B model, modified to run on unleaded 91 NORM fuel.
Through preliminary tests, a method was set up to evaluate knock by oscilloscope, and a test cycle of 216 h was run which permits reproduction of the stabilization of deposits equivalent to 40,000 km (25,000 miles) of operation. With this type of test, straight mineral oils, ashless oils, and oils containing traditional organometallic, calcium/zinc, barium/zinc, and magnesium/zinc base additives as well as calcium, sodium, and zinc base additives of new formulation were evaluated. The results revealed that ORI values are almost identical, that is, 3-4 octane numbers for both the straight mineral and ashless oils.
As regards the oils with organometallic additives, ORI is influenced by the nature of the metal, and its values are in the range of 8-5 octane numbers.
Also, the relation between ash content and ORI value was evaluated for the calcium/zinc and barium/zinc oils; it appears that ORI decreases only when the ash content is less than 0.3%.
The results obtained with primary reference fuels (PRF) were confirmed with two full boiling range fuels (FBRF).
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Citation
Marciante, A. and Chiampo, P., "Influence of Lubricating Oil Ash on the ORI of Engines Running on Unleaded Fuel," SAE Technical Paper 720945, 1972, https://doi.org/10.4271/720945.Also In
References
- Miller D. F. “The Outlook for Automotive Oils-1970-1980.” National Fuels and Lubricants Meeting New York September 1970
- White, M. T. Jr. “The Changing Automotive Engine Lubrication Requirements of the 1970's.” Japan Petroleum Institute Meeting Tokyo October 1971
- Sezzi F. et al. “Detonazione e Pre-accensione nei Motori Commerciali: Cause ed Effetti.” Atti XVII Congresso Nazionale ATA Torino June 1969
- Gibson F. H. “Factors Affecting Octane-Number Requirement.” SAE Quarterly Transactions 3 December 1949
- Dowhs Theobald B. “The Effect of Fuel Characteristics and Engine Operating Conditions on Preignition.” Proceedings 1963-1964 174
- Felt A. E. et al. “Use of Lead-Free Gasolines Can Present Serious Problems.” Automotive Engineering 79 March 1971
- Crouse W. W. et al. “Effect of Unleaded Fuel on Lubricant Performance.” Paper 710584 SAE Mid-Year Meeting Montreal June 1971
- Hall C. A. Felt A.E. Brown W. J. “Evaluating Effects of Fuel Factors on Stabilized Exhaust Emission Levels.” SAE Transactions 78 1969 paper 690014
- Marciante A. Chiampo P. “The Influence of Lubricating Oil Ash on Surface Ignition Phenomena.” Paper 700458 SAE Mid-Year Meeting Detroit May 1970
- Scott L. B. et al. “Deposit-Induced Runaway Surface Ignition.” Paper 544B SAE Summer Meeting Atlantic City June 1962