- From the experimental investigations, for high viscous fuel HOME e slow burning producer gas operation, it is observed that HOME-producer gas operation resulted in improved performance with a nozzle geometry of fuel injection pressure (230 bar), number of nozzle hole (4 hole) and size (0.25 mm). The increase in injection pressure, hole number with smaller hole size could lead to efficient mixture preparation resulting in lower emissions. Significant improvements in power output and the trade-off between smoke and NOx emissions can be obtained for dual fuel operation if mentioned nozzle geometry is used along with re-entrant combustion chamber configuration.