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Unleaded versus Leaded Fuel Results in Laboratory Engine Tests
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Abstract
A test program was conducted using a wide variety of laboratory oil and fuel performance test procedures in order to compare effects of unleaded fuel versus leaded fuel. These tests included standard industry-accepted procedures such as Sequences IIB, IIIC, and VC, as well as procedures unique to the Lubrizol laboratory. Preliminary results which are reported in this paper will be subjected to verification in future tests. Initial results have indicated that unleaded fuel is more severe than leaded fuel with respect to varnish deposits, full throttle octane requirement increase, exhaust valve seat wear, and wear of certain other engine components. Results have also shown unleaded fuel to be less severe on rust deposits, spark plug fouling, and oil thickening due to oxidation. Sludge deposits were only slightly less severe with unleaded fuel, and the differences compared with leaded fuel are not believed to be significant. The use of exhaust gas recirculation in selected test procedures has shown that suitably formulated crankcase oils can counteract possible detrimental engine deposits resulting from this anticipated means of oxides of nitrogen control.
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Fuchs, E., "Unleaded versus Leaded Fuel Results in Laboratory Engine Tests," SAE Technical Paper 710676, 1971, https://doi.org/10.4271/710676.Also In
References
- ASTM Minutes Committee D-2, Technical Division B Dallas December 8 1970
- Stevenson D. J. “Availability of Additives to Meet the Changing Automotive Oil Quality Requirements.” Paper F & L 70-48 NPRA National Fuels and Lubricants Meeting New York September 1970
- Sieloff Frank X. “A New Decade in Automotive Service Lubrication.” IOCA Meeting San Francisco October 1970
- Dimitroff Edward Moffitt John V. Quillian, R. D. Jr. “Why, What, and How: Engine Varnish Formation.” ASME and ASLE Lubrication Conference Atlantic City October 1968
- Gagliardi J. C. Ghannam F. E. “Effects of Tetraethyl Lead Concentration on Exhaust Emissions in Customer-Type Vehicle Operation.” Paper 690015 SAE Automotive Engineering Congress Detroit January 1969
- 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
- Doelling R. P. Gerber A. F. Walsh M. P. “The Effect of Gasoline Characteristics on Automotive Exhaust Emissions.” ASTM Workshop on the Effect of Automotive Emission Requirements on Gasoline Characteristics Toronto June 1970
- Pahnke A. J. Squire E. C. “No Effect on Exhaust Emissions Found in 18-Month Consumer-Car Test.” The Oil and Gas Journal 64 1966 106
- Pahnke Alden J. Conte James F. “Effect of Combustion Chamber Deposits and Driving Conditions on Vehicle Exhaust Emissions.” SAE Transactions 78 1969 paper 690017
- Pless Loren G. “The Effects of Some Engine, Fuel, and Oil Additive Factors on Engine Rusting in Short-Trip Service.” SAE Transactions 79 1970 paper 700457
- Bailey C. H. “Engine Rust-Measurements by a New Technique Shed Light on Why Lubricated Parts Rust.” Paper 717B SAE International Summer Meeting Montreal June 1963
- Cordera F. J. Foster H. J. Henderson B. M. Woodruff R. L. “TEL Scavengers in Fuel Affect Engine Performance and Durability.” Paper 877A SAE Summer Meeting Chicago June 1964
- Gagliardi J. C. “Cylinder Bore and Piston Ring Wear.” ASM Wear Conference Chicago Denver Boston 1969
- Bardy D. C. Asseff P. A. “Motor Oil Thickening-A CLR Engine Test Procedure Which Correlates With Field Service.” SAE Transactions 79 1970 paper 700508
- Felt A. E. Kerley R. V. “Engines and Effects of Lead-Free Gasoline.” Fall Meeting, SAE Mississippi Valley Section Davenport, Iowa October 22 1970
- U. S. Department of Health, Education, and Welfare “Control of Air Pollution From New Motor Vehicles and New Motor Vehicle Engines.” Federal Register 33 2 January 4 1968
- Goodwillie R. E. Jacob N. M. Beckman E. W. “The Chrysler Cleaner Air System for 1970.” Paper 700151 SAE Automotive Engineering Congress Detroit January 1970
- BIA Monday Morning Report VIII 47 November 30 1970
- Deeter W. F. Daigh H. D. Wallin, O. W. Jr. “An Approach for Controlling Vehicle Emissions.” SAE Transactions 77 1968 paper 680400