Graduate Thesis Or Dissertation
 

Effect of hydrous ethanol on crankcase oil dilution

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

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  • Adequate lubrication is of the utmost importance in internal combustion engines. Low temperature operation with low-proof alcohol may create some operational problems if alcohol and or water accumulates in the crankcase oil. Condensates of unburned alcohol and water may be blown into the crankcase oil with blow by gases. The secondensates may form an emulsion with the crankcase oil that may restrict the supply of oil for adequate lubrication.Three engine tests were performed to identify the effect of low-proof ethanol fueling on crankcase oil dilution and degradation.The first test was hydrous ethanol carburetion in a2.3 liter, 4 cylinder, 1974 Ford gasoline engine. The second test was a mixture of low-proof ethanol fumigation and normal diesel fuel injection (at reduced rate) in an Allis-Chalmers Model 2900 turbocharged diesel engine. The third test was also a mixture of ethanol fumigation and diesel injection in an Allis-Chalmers Model 2800 naturally aspirated 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 form of ethyl alcohol and proof of the ethyl alcohol were considered and varied. After each test the oil was sampled for American Society for Testing and Materials (ASTM) laboratory tests for determination of flash points, fire points, water by centrifuge, water by distillation, and viscosity at room temperature.Results for the first test indicate that the use of ethanol of 130 proof or less may result in accumulation of water in the crankcase oil that may be harmful to the engine. In the second and third tests although there was a decrease in fire and flash points as well as in the viscosity of the oil, no appreciable amount of water or alcohol was detected in the crankcase oil. It is important to mention that there was a maximum alcohol fuel flowrate beyond which the diesel engine starts to knock or misfire.
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