In the US, new engines from Cummins have been unveiled. The new engine classifications for the US market are designed to meet the next set of US EPA emission control rules, due to come into force in 2017. The new rules put their emphasis on lower carbon emissions.
The new engines also come with a new naming scheme, they are the X15 Performance Series, the X15 Efficiency Series and the X12. These are set to replace the current ISX offerings sold in the North American market. If and when the new engines or some of their technology may be released here in Australia is, as yet, unclear.
“Inspired by our customers and their business needs, Cummins is delivering the power of great ideas with our next-generation engines revealed today as the X15 Performance Series, the X15 Efficiency Series and the X12 focused on productivity, each optimised for specific duty cycles and applications,” said Srikanth Padmanabhan, Cummins President Engine Business.
He was speaking at the recent ‘Four Strokes of Genius’ event held at the Transportation Research Centre in Ohio, where a fleet of trucks powered by the X15 and X12 were put through their paces on the test track.
The new X engine platform is said, by Cummins, to be taking on new names to reflect the evolution and introduction of the product platforms to meet new greenhouse gas (GHG) and fuel-efficiency standards, to be fully implemented in 2017 in the US.
The X15 features an optimised compression ratio, air handling system and cam profile. The X12 introduces the highest power-to-weight ratio of any heavy-duty engine sold in North America. All three engines in the new range have something called Single Module after treatment.
This is said to be up to 60 per cent smaller and 40 per cent lighter than modular after treatment systems, the Single Module is claimed to be capable of taking DPF ash cleaning events to beyond 1.2 million km on the X15.
“Our technology success achieves an unprecedented degree of integration across the powertrain and with the driver as represented by the Cummins and Eaton SmartAdvantage Powertrain, enabling major fuel savings by precisely adjusting to grade, vehicle weight and throttle position,” said Padmanabhan. “Together with features such as ADEPT, SmartCoast and Predictive Cruise Control, we can make every driver an expert.
“Cummins ability to integrate doesn’t stop with our products, but continues through our network of accessible experts ready to partner with fleets and drivers all over North America. We can also deliver engine calibrations and Cummins expert guidance over the air, without the truck needing to visit a service bay. That’s how the power of great ideas translates into real-world benefits for our customers.”
The X15 Performance Series has been designed to suit heavy duty and vocational trucks, with a 485-605 hp ratings range, while the X15 Efficiency Series is aimed at line-haul and regional carrier applications, with a 400-500 hp range. The X12 is being offered in a 350-475 hp range for intrastate and vocational trucks.
The X12 is rated up to 475 hp, and provides up to 2304 Nm (1700 ft lb) of peak torque at 1000 rpm, available to over 1400 rpm. Engine weight is reckoned to be 930 kg, using, what is called, a sculptured block design, with unnecessary mass being removed while retaining high rigidity. Weight savings are also achieved by the use of high-strength composite materials for the oil pan and valve cover.
“During the design process for the X12, we evaluated every opportunity to reduce size and lower weight, but importantly, we achieved this with no compromise to structural strength, so that our next-generation 12 l comes with all the durability associated with a Cummins Heavy-Duty engine,” said Jim Fier, Cummins Vice President Engineering.
The X15 Performance Series features an upgraded high flow air-handling system, said to give a faster pedal response, for better drivability at full payload and on steep-gradient climbing. Peak torque of up to 2780 Nm (2050 ft lb) is available alongside over 450 hp of engine braking at just 1500 rpm and up to 600 hp at 2100 rpm.