The Cummins G Series engine family, including ISG and QSG models, represents a breakthrough in heavy-duty diesel engineering with 10.5L and 11.8L displacements delivering 290-512 horsepower . These engines feature the XPI common-rail fuel system derived from the X Series, achieving peak torque up to 1,700 lb-ft with 60% torque rise for exceptional throttle response . A sculptured block and composite materials reduce weight to just 1,900 pounds, delivering over 30% higher power-to-weight ratio than competitors . The QSG12 meets Tier 4 Final emissions using only SCR technology without cooled EGR, simplifying aftertreatment .
Globally, the ISG11 and ISG12 power heavy-duty trucks, buses, and fire apparatus across North America, Europe, and Asia, meeting Euro III through Euro VI standards . The QSG12 dominates off-highway applications worldwide—powering tractors, combines, wheel loaders, excavators, and mining equipment across six continents . Manufactured initially at Beijing Foton Cummins, the G Series delivers global reliability with compact, lightweight design .