A 10.44 kW, 0.673 cc naturally aspirated air-cooled diesel engine has been tested on producer gas generated by gasifying Douglas fir wood blocks using laboratory-scale gas producer. A simple control system to meter the producer gas to the enginewas developed.Gas use caused a 10-percent reduction in maximum torque as compared to that with diesel fuel alone, and as much as 15-percent increase in indicated thermal efficiency. Up to 72 of the fuel energy at intermediate torque levels could be supplied fromproducer gas, and with the controls, it is possible to achieve a cost savings of up to 18 of the cost of using the engine in the diesel mode.
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