Impact of Gasohol on the L-141 and LDT-465-1C Engines.
Abstract : Gasohol was analyzed in the L-141 and LDT-465-1C engines in
order to determine its impact upon engine operability. During various
steady-state operating conditions, with the L-141 engine, gasohol was found to
improve economy under heavily loaded conditions, while a deterioration will
occur during light and intermediate loading. An evaluation of emission and
nonemission-regulated carburetors shows the nonemissions carburetor better
suited for gasohol use. No effects on maximum power produced were noted with
gasohol. Simulated driveability tests with the L-141 engine on a dynamometer
showed differences in engine response between the different fuels, but actual
vehicle tests proved that driveability was not altered. A relatively short
endurance test with the L-141 engine on gasohol fuel indicates, based on engine
oil analysis, no significant change in engine wear rates. The endurance test did
indicate, however, that more frequent oil drain intervals may be required due to
TBN depletion of the engine oil. Cold start testing of the LDT-465-1C engine
indicates that gasohol is of inadequate cetane number to sustain normal engine
operation. Thus, it is recommended that gasohol not be used in the LDT-465
family of engines. (Author)