An Experimental Study on the Performance of a Multifuel Engine : (Part 2. Effect of Pilot Injection of Fuel)

The idea that the ignition lag of the main spray can be reduced by a preceding injection of pilot spray has been investigated several times. This means was found effective to realize multifuel operation of a conventional diesel engine. In order to realize pilot injection, many ideas have been conceived, but in this study two independent injection pumps and one common nozzle were employed. First, an investigation was made to determine whether injection characteristics of the proposed injection system were suitable for practical engine operation or not, and desirable results could be obtained. Secondly, we attempted at the operation of a pre-chamber diesel engine on low cetane fuel, and excellent results could be obtained with pilot injection if automotive gasoline was used. And the reduction in the ignition lag of the main fuel was caused mainly by the pre-reaction of the pilot fuel.