Water-to-diesel fuel ratio for emulsion and water injection methods was fixed as 0.4:1 (by mass). All tests were done
at constant speed of 1500 rpm. He concluded that both methods were capable of reducing NO emission drastically in this diesel engine. However, CO and HC levels were higher for water emulsion than that of water injection. Peak pressure, ignition delay and maximum rate of pressure rise were lesser for water injection compared to emulsion method [4,14]