Cummins ISG12

Cummins has announced a new global heavy-duty engine platform, developed to complement its existing product offering. The new G Series platform is an in-line six cylinder engine and will be available in 10.5- and 11.8-liter displacements to meet a broad variety of on-highway and off-highway applications and emissions standards. Initial engines are designed to run on diesel fuel, a statement that clearly implies other fuel sources are in the offing.

Design and development of the engine has been led by a team in the United States, and supported by global technical and marketing resources with knowledge of local market and customer needs. This global design approach uses the latest advanced technologies to develop an adaptive architecture, says Cummins, with each engine designed to meet unique performance and cost-of-ownership expectations for its target market and region.

The G Series will initially be manufactured in China by the Beijing Foton Cummins Engine joint venture, serving customers around the world. Production will start during the first half of 2014.

“The G Series global design approach is a vivid demonstration of how Cummins is transforming from a multinational to a truly global company,” said Steve Chapman, Cummins vice president and group vice president – China and Russia. “This engine platform has been designed for diverse and global markets by utilizing the expertise and local knowledge of our engineers from around the world.”

The G Series minimizes engineering requirements for vehicle and equipment manufacturers with a common, compact installation envelope. A key design focus for the G Series 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 G Series achieves a remarkably low engine weight of just 1900 lb (862 kg) while retaining structural strength and durability, says Cummins.

The G Series incorporates Cummins Xtra-High Pressure Injection (XPI) fuel system, derived from the larger X Series engine. This contributes to peak torque for the G Series of 1700 lb ft, together with an available torque rise as high as 60%.

The G Series offers fuel efficiency through parasitic-reducing technology without variable-flow pumps that are said to 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.

For on-highway markets, the G Series Heavy-Duty engine platform will be introduced as the Cummins ISG11 and Cummins ISG12 with a power range from 290 hp to 512 hp. Engines will be available to meet global variations in emissions requirements. At launch in 2014, engines will meet Euro III, Euro IV and China NS4 emissions requirements. Engines for Euro V, Euro VI and U.S. Environmental Protection Agency standards are also in development. The ISG11 and ISG12 will power heavy-duty trucks in long-haul, regional-haul and vocational service, as well as buses, motor coaches, fire trucks, and recreational vehicles.

One engine from the new G Series platform was initially unveiled at a construction show this past April under the name QSM12, and will now be renamed QSG12 as part of this family of engines. The QSG12 is purpose-designed to meet U.S. EPA Tier 4 Final and European Union (EU) Stage IV emissions regulations with a more compact envelope and a more than 30% higher power-to-weight ratio than the class average for engines with a similar power range, says Cummins. High-efficiency air handling and advanced combustion enable the QSG12 to achieve near-zero emissions without the need for a cooled exhaust gas recirculation (EGR) system. With ratings from 335 to 512 hp, it aims at non-truck applications.

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