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Although No. 2 diesel fuels all give about the same amount of exhaust smoke when compared in an engine over test periods of a few minutes, they differ greatly in their injector-fouling rates during long-term engine operation. Thus, differences in smoke and full-throttle power output caused by differences in injector-fouling rates are vastly more important to the diesel operator than short-term smoke. Fuels lacking sufficient thermal stability permit rapid deposit buildup in injectors and on spray tips. The result is increased exhaust smoke, loss of power, and shortened injector life. Hydrogen treating improves the stability of diesel fuel and promotes long injector life. In truck tests under severe operating conditions, injector life with hydrogen-treated fuels was two to three times that obtained with straight-run fuels. Smoke-suppressant additives are now available to alleviate heavy smoke emissions from problem vehicles. One of these also cleans most fouled injectors in 3000 to 6000 miles.
diesel fuels, fuel oils, injectors, fuels, air pollution, smoke, exhaust gases, fuel injection, fuel consumption, thermal stability, hydrogenation
Irish, G. E.
Senior research chemist, Union Oil Company of California, Brea, Calif.
Wiseman, E. L.
Supervisor of Fuels Research, Union Oil Company of California, Brea, Calif.