The new QSG12 brings a major advantage for Tier 4 Final and Stage IV equipment installations by restoring the envelope size of the QSM11 predecessor, used for Tier 3 and Stage IIIA applications. Higher efficiency air handling and advanced combustion enable the QSG12 to return to the simplicity of a wastegated turbocharger and achieve near-zero emissions without the need for a cooled Exhaust Gas Recirculation (EGR) system. As a result, internal loads on the QSG12 are reduced to free up extra power potential, while heat rejection is lowered by over 40 percent compared with engines using cooled EGR.

qsg12 cummins engine overview

A key design focus for the QSG12 has been to achieve significant weight savings in order to increase the power-to-weight ratio. A sculptured block retains high rigidity while removing unnecessary mass. The use of composite material for the oil pan and valve cover provides further weight savings. With this innovative approach, the QSG12 achieves a remarkably low engine weight of just 1900 lb (862 kg) to enable a top-rated power-to-weight ratio of 0.27 hp per lb (0.44 kW per kg) while retaining all the structural strength and durability expected of a Cummins heavy-duty engine.
The G Series offers fuel efficiency through parasitic reducing technology without variable-flow pumps that add unnecessary cost and reduce reliability. Its Single Cam In Head (SCIH) design with roller valve train and high-efficiency intake ports continues the design theme of minimum complexity and maximum efficiency. The resulting low-weight design allows more payload to be delivered while requiring less energy to manufacture than competitive designs.


qsg12 cummins engine specs

The QSG12 incorporates Cummins Xtra-High Pressure Injection (XPI) fuel system, derived from the larger and more powerful QSX15 Tier 4 Final engine. Although scaled down in size for the 12-liter platform, the XPI fuel system retains all the robust, heavy-duty characteristics of the system, proven up to 675 hp (503 kW) on the 15-liter.
With multiple injection events driven by high-precision Cummins electronic controls, the XPI fuel system contributes to a very impressive peak torque for the QSG12 of 1700 lb-ft (2305 N•m), together with a torque rise as high as 60 percent available. These attributes enable the QSG12 to deliver exceptionally fast response to increasing load factors from low engine rpm.

Power         335 - 512 hp        250 - 382 kW
Torque        1700 - 1700 lb-ft   2305 - 2305 N•m
Certification Tier 4 Final /      Stage IV


The QSG12 is built ready to deal with the toughest operational extremes experienced by off-highway machines. Even working under high load factors, the QSG12 will achieve the same legendary life-to-overhaul as that achieved by the QSM11 at Tier 3 and Stage IIIA. Operators of QSG12-powered machines can expect – and may exceed – 12,000 hours before overhaul. Significantly, no midlife engine overhaul is required.

Cummins DPF-SCR aftertreatment system is able to withstand severe shock loads and vibration, designed with durability equivalent to that of the engine. Additionally, the QSG12 can work at 45-degree angularity with just the standard oil sump fitted.

To provide maximum engine protection, particularly when working under dusty conditions, the QSG12 features an integrated Cummins Direct Flow™ air filtration system developed for Tier 4 applications. The Direct Flow air filter provides greater dust-holding capacity in a smaller package, with filter element change intervals at least twice that of conventional air filters. The filter also features an embedded smart sensor to fully integrate air-intake flow with the engine combustion.


qsg12 cummins engine for sale

The new QSG12 brings a major advantage for Tier 4 Final and Stage IV equipment installations by restoring the envelope size of the QSM11 predecessor,Pls send your inquiry details of engines and parts to Official mailbox : scdc@client-engine.com , we will offer soon after I got your inquiry.