The X15D – or PX-15 as it is known in PACCAR’s newly-released DAF XG cabover – is an entirely new 15-litre Cummins platform, available only with Euro 6 emissions compliance.
“Cummins has taken internal combustion to the next level with the X15D,” says Sean McLean, Director and General Manager of On-Highway Business for Cummins Asia Pacific.
“It delivers the highest-ever outputs for a Cummins truck engine while setting new standards for fuel efficiency at ultra-low emissions levels.”
The top rating is 660hp at 1800rpm backed up by massive peak torque of 2360 lb/ft which extends from 1400rpm all the way back to 900rpm.
This rating eclipses the existing X15 peak outputs of 625hp/2050lb/ft and enhances Cummins’ engine downspeeding strategy for improved fuel economy.
This strategy is aimed at lowering cruise rpm for fuel efficiency gains while at the same time providing the performance to meet both driver and trip time expectations.
Another key feature is the X15D’s dry weight reduction of 225kg compared with the existing X15.
A sculpted iron block and composite oil pan are among the weight saving features that result in the X15D having the highest power-to-weight density in the industry.
The lighter engine is also a big advantage in cabover applications, providing significantly reduced front axle tare weight. The latest evolution of Cummins’ XPI (Extreme Pressure Injection) fuel system is used on the X15D as is a standard wastegate turbocharger.
Euro 6 emissions compliance is achieved with single module aftertreatment technology that integrates both the diesel particulate filter (DPF) and AdBlue SCR system.
Australian Release
The first example of the new 15-litre platform is already underway with the PX-15 branded engine in Paccar’s new DAF XG cabover.
ZF’s automated 16-speed TraXon transmission harnesses the high torque of the PX-15 and drives through to Cummins-Meritor MT21-165 rears. Gross combination mass (GCM) rating of the DAF XG is 97 tonnes.
The X15D will be available for other truck brands to meet Euro 6 requirements into the future, with higher GCM applications in Australia following further field testing and validation.
Eagerly awaited will be an Eaton Cummins automated 18-speed Endurant transmission to handle the 2360 lb/ft torque rating.
“Initial field testing of the engine has focused on B-double type applications.” says Sean.
“Eighteen units rated at 660hp have been involved in the validation program with customers, accumulating around six million kilometres.”
The program has since met the primary objectives of Cummins.
“That was to gain feedback on fuel economy, performance and durability,” Sean says. “We’ve had great feedback, especially on driveability and torque.”
He points out that Cummins will continue to field test in higher gross weight combinations to ensure durability and performance of the X15D prior to release in these applications.
The X15D is part of Cummins ‘fuel agnostic’ platform known as HELM – Higher Efficiency, Lower emissions, Multiple fuels – which comprises diesel, natural gas and hydrogen internal combustion engines derived from a common base with high parts commonality.
A HELM display will be featured at the Brisbane Truck Show.
The remarkable transformation of Cummins in recent years to become a genuine powertrain supplier – from engine to transmission to axles and brakes – will also be in evidence for the first time in Australia at the show.
A world-first display showing the integration of Cummins X15 engine, Eaton Cummins 18-speed Endurant transmission, and Meritor driveline, axles and brakes – will be in the spotlight at Brisbane.
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