Effect of hydrous ethanol on crankcase oil dilution Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/xg94hv489

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  • Adequate lubrication is of the utmost importance ininternal combustion engines. Low temperature operationwith low-proof alcohol may create some operational problemsif alcohol and or water accumulates in the crankcaseoil. Condensates of unburned alcohol and water may beblown into the crankcase oil with blowby gases. Thesecondensates may form an emulsion with the crankcase oilthat may restrict the supply of oil for adequate lubrication.Three engine tests were performed to identify theeffect of low-proof ethanol fueling on crankcase oil dilutionand degradation.The first test was hydrous ethanol carburetion in a2.3 liter
  • Adequate lubrication is of the utmost importance ininternal combustion engines. Low temperature operationwith low-proof alcohol may create some operational problemsif alcohol and or water accumulates in the crankcaseoil. Condensates of unburned alcohol and water may beblown into the crankcase oil with blowby gases. Thesecondensates may form an emulsion with the crankcase oilthat may restrict the supply of oil for adequate lubrication.Three engine tests were performed to identify theeffect of low-proof ethanol fueling on crankcase oil dilutionand degradation.The first test was hydrous ethanol carburetion in a2.3 liter, 4 cylinder, 1974 Ford gasoline engine. Thesecond test was a mixture of low-proof ethanol fumigationand normal diesel fuel injection (at reduced rate) in anAllis-Chalmers Model 2900 turbocharged diesel engine. Thethird test was also a mixture of ethanol fumigation anddiesel injection in an Allis-Chalmers Model 2800 naturallyaspirated diesel engine.Ethanol of 130 and 160 proof was used in these tests.The duration of each test was six hours steady operation.Independent parameters of crankcase oil temperature, engineload and speed, percent of total energy in the formof ethyl alcohol and proof of the ethyl alcohol wereconsidered and varied. After each test the oil was sampledfor American Society for Testing and Materials (ASTM)laboratory tests for determination of flash points, firepoints, water by centrifuge, water by distillation, andviscosity at room temperature.Results for the first test indicate that the use ofethanol of 130 proof or less may result in accumulation ofwater in the crankcase oil that may be harmful to theengine. In the second and third tests although there wasa decrease in fire and flash points as well as in the viscosityof the oil, no appreciable amount of water oralcohol was detected in the crankcase oil. It is importantto mention that there was a maximum alcohol fuel flowrate beyond which the diesel engine starts to knock ormisfire.
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