Abstract
Tests were made to determine the operating characteristics of automotive engines with respect to cylinder wear, carbon deposits, life of accessories, and vapor lock. Fuels circulating through standard type pumps for a period equivalent to 200,000 miles had no visible effect on pump diaphragms. Cylinder wear with various fuels was determined by an optical instrument, the McKee wear gage. Wear is determined from changes in lengths of indentations made in cylinder walls with a precisely shaped diamond tool. The wear with alcohol was about half that with leaded gasoline. Carbon deposits also were much lower. There was no indication of dilution of crankcase oil by alcohol. The temperature limits for operation without vapor lock were established for various blends of alcohol with ether and with acetone.
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