Fuel injection has a critical role in an internal combustion engine and a significant
effect on the quality of the fuel spray. In turn, fuel spray directly affects an engine´s combustion,
efficiency, power and emissions. This study evaluated three different injector nozzles in a highspeed, non-road diesel engine. It was run on diesel fuel oil (DFO) and testing was conducted at
three different engine loads (100%, 75% and 50%) and at two engine speeds (2,200 rpm and
1,500 rpm). The nozzles had 6, 8 and 10 holes and a relatively high mass flow rate (HF). The
study investigated and compared injection and combustion characteristics, together with gaseous
emissions. The combustion parameters seemed to be very similar with all studied injector nozzles.
The emission measurements indicated general reductions in hydrocarbons (HC), carbon
monoxide (CO) and nitrogen oxides (NOx) at most load/speed points when using the 6- and
10-hole nozzles instead of the reference 8-hole nozzles. However, smoke number increased when
the alternative nozzles were used