The X15 was not the only Euro 6 engine Cummins unveiled at the Brisbane Truck Show. The 12-litre X12 was also on display and, like its 15-litre stablemate, has the design aim of being EGR-free for the next round of emissions regulations.
The X12, which uses SCR/AdBlue technology for Euro 6, is the next generation evolution of a 12-litre Cummins platform that is already proven in applications worldwide as the ISG.
The Euro 5 version of the 12-litre Cummins has been on test in Australia since early 2015 rated at 500 hp and 1700 lb ft of torque, achieving the highest power-to-weight ratio of any engine in the 10-to-16-litre class.
“The results of the field test have exceeded all expectations,” says Mike Fowler, director of engine business for Cummins South Pacific. “As industry and government shift their focus to energy productivity, the X12 hits the target.”
The innovative architecture of the X12 results in a remarkably low engine weight of just over 900 kg achieved through a sculptured block design and the use of high-strength composite materials.
The X12 incorporates Cummins’ XPI (Extreme Pressure Injection) common rail fuel system, derived from the X15. Generating injection pressures in excess of 30,000 psi, the XPI system improves combustion and fuel economy, reduces noise and enables fast response at low rpm. A standard wastegate turbocharger is also used.
The use of a rear geartrain contributes to overall engine refinement by reducing vibration and lowering noise.
The X12 offers enhanced fuel efficiency through parasitic reducing technology without variable-flow pumps that add unnecessary cost and reduce reliability. Its single cam in-head design with roller valve train and high-efficiency intake ports continues the design theme of minimum complexity and maximum efficiency.

Cummins’ expertise in aftertreatment solutions is demonstrated in the new high performance ‘Compact Box’ for the X12 Euro 6 that integrates the SCR system and diesel particulate filter (DPF) and is considerably smaller than the most compact Euro 6 systems already on the market. Optimised catalysts and advanced urea dosing achieve higher NOx conversion rates and further improve fuel efficiency.

About Cummins Inc.

Cummins Inc., a global power leader, is a corporation of complementary business units that design, manufacture, distribute and service diesel and natural gas engines and related technologies, including fuel systems, controls, air handling, filtration, emissions solutions and electrical power generation systems. Headquartered in Columbus, Indiana (USA), Cummins currently employs approximately 55,400 people worldwide, and serves customers in approximately 190 countries and territories through a network of approximately 600 company-owned and independent distributor locations and more than 7,400 dealer locations. Cummins earned US$1.39 billion on sales of US$17.5 billion in 2016. Press releases can be found on the Web at cummins.com or cummins.com.au.

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Murray Clifford
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