typical engine of Isuzu 4JB1/T & 4JA1/T Parameter 4JA1 CNG/LPG4JB1 CNG/LPGBore x stroke93X92mm93 mm x 102 mmType4 stroke, water cooling, inline,Displacement2.499L2.771LCompression ratio12:1 /CNG10:1 /LPG12:1 /CNG10:1 /LPGIgnition order1-3-4-2Lubricating methodForced and Splash lubricationRated power/speed53 kw /3,600 rmp60 kw /3,600 rpm60 kw /3,600 rmp68 kw /3,600 rmpMax torque/speed155 N.m /2, ...