Used Vegetable Oil Fuel Blend Comparisons Using Injector Coking in a DI Diesel Engine

An imaging system was used to compare injector coking when used vegetable oil from local grocery store deli fryers was used as a diesel fuel replacement in small proportions. Fuel blends containing from 2.5% to 20% used vegetable oil were studied to determine which oil fuel blend would be optimal for future engine testing. The 2.5% oil fuel blend had injector coking levels slightly more than that of diesel fuel, while higher blends tended to have significantly higher injector coking levels.

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