Experimental study on a spark ignition engine fueled by CH4/H2 (70/30) and LPG

In the present study, a single-cylinder four-stroke SI engine was operated with LPG (C4H10/C3H8, 70:30), hydrogen and methane mixture (H2/CH4, 30:70). Experiments were conducted at excess air ratio between 0.8 and 1.5. Spark timing was varied from 14 to 35° CA BTDC under a constant load of 6 Nm at 1400 rpm.