BRAKE & PLANETARY GP 1394126 - Caterpillar

different fuel systems are available:
Low Emission (LE) with high-pressure gas
LE with low-pressure gas
Standard (stoichiometric) with high-pressure gasThe LE engine with high-pressure gas requires a gas pressure within a range of 207 to 310 kPa (30 to 45 psi). The air/fuel ratio is adjusted so that there is excess oxygen in the engine exhaust. This process reduces the NOx emissions.The LE engine with low-pressure gas requires a gas pressure within a range of 10 to 34 kPa (1.5 to 5 psi).The LE engines with NOx ratings of 2 grams have a nominal air/fuel ratio that results in approximately 8 percent of free oxygen in the exhaust. The LE engines are turbocharged and aftercooled.The Standard engines require gas pressure within a range of 138 to 172 kPa (20 to 25 psi). The nominal air/fuel ratio results in approximately 2 percent of free oxygen in the exhaust. The Standard engines are available with natural aspiration or turbocharged with aftercooling.The engines can be equipped with a dual fuel system in one