Cummins Quantum Series


Cummins Quantum Series is a family of internal combustion engines, developed and manufactured by American Cummins for various heavy-duty use cases. The Quantum series comes with an electronic controlled module. It is used in heavy duty machines and in railway machines.

Current types

The lineup consists of adaptations of F, B, L, X series and Quantum-only K series. There are also G12 and T30 engines in the lineup.

Diesel engines

Vast majority of Quantum series engines are Diesel engines. Those are compared in the table below:
EngineDisplacementBoreStrokePowerTorqueGoverned SpeedDry/Wet Weight
QSF2.8 I4171 ci 3.7 in 3.94 in 49 - 74 hp 147 - 221 lb-ft ~ 507 lb
QSF3.8 I4230 ci 4.02 in 4.53 in 74 - 130 hp 277 - 360 lb-ft ~ 616 lb
QSB4.5 I4275 ci 4.02 in 5.39 in 109 - 173 hp 347 - 520 lb-ft 3500~ -/818 lb
QSB6.7 I6409 ci 4.21 in 4.88 in 133 - 550 hp 431 - 1250 lb-ft 3400~ -/1047 lb
QSL9 I6543 ci 4.49 in 5.69 in 230 - 410 hp 675 - 1200 lb-ft 3300~ 2153 lb
QSG12 I6 721 ci 5.2 in 5.67 in 335 - 512 hp 1700 lb-ft 2600~ 2227/- lb
QSX15 I6912 ci 5.39 in 6.65 in 400 - 675 hp 1650 - 2050 lb-ft 2400~ 3009/- lb
QSK19 I61150 ci 6.25 in 6.25 in 506 - 800hp 1775 - 2275 lb-ft 2400~ -/4250 lb
QSK23 I61404 ci 6.69 in 6.69 in 760 - 950 hp 2401 - 2897 lb-ft 2100~ -/6300 lb
QST30 V121861 ci 5.51 in 6.5 in 760 - 1500 hp 2764 - 4877 lb-ft 2100~ -/7337 lb
QSK38 V122300 ci 6.25 in 6.25 in 920 - 1500 hp 3591 - 4590 lb-ft 2100~10700 lb
QSK45 V122746 ci 6.25 in 7.48 in 1200 - 2250 hp 4425 - 6300 lb-ft 2100~ -/13500 lb
QSK50 V163068 ci 6.25 in 6.25 in 1487 - 2500 hp 1800 - 7080 lb-ft 2000~ 13,822/14808 lb
QSK60 V163661 ci 6.25 in 7.48 in 1050 - 2850 hp 6169 - 7839 lb-ft 1900~ 19258 lb
QSK78 V184735 ci 6.69 in 7.48 in 3500 hp 10157 lb-ft 1900~ -/24134 lb
QSK95 V165797 ci 7.48 in 8.27 in 3000 - 5100 hp 11671 - 17802 lb-ft 1800~ 29000 lb
QSK120 V207246 ci 7.48 in 8.27 in 5000+ hp 1500

Gas engines

Natural gas engines also exist.