Paccar updating engine family

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Paccar has made 1.4 million engines since 1957, and it’s taking yet another step in its evolution with updates to the 2017 MX-11 and MX-13 engines.

The 2017 MX-13 is now offered with as much as 510 horsepower and 1,850 lb-ft of torque, while the MX-11 output climbs to 430 horsepower and 1,650 lb-ft. Yet another MX-11 is offered at 335 horsepower and 1,150 lb-ft.

The peak torque is reached at 900 rpm in the majority of the engine ratings.

Oil drain intervals on the 2017 engine family climbs to 75,000 miles from 60,000 miles, thanks to enhanced combustion processes as well as the company’s growing experience with North American duty cycles, says Landon Sproull, vice president – Paccar powertrain.

The MX engines are also designed with a B10 life of a million miles, meaning that 90% of them are expected to reach that threshold without needing a major overhaul. And they come standard with factory-installed remote diagnostics.

The one thing they offer less of is weight. About 100 pounds was reduced with a new single-canister aftertreatment system. Close to 50 pounds has been shed form the MX-13, largely with the help of a new high-performing turbocharger. One version is used for models with up to 485 horsepower, while a second version is made beyond that. “A lot of that weight came out of the turbo,” says Sproull, referring to optimized combustion processes, piston rings and geometry.

The engines will be available in Kenworth and Peterbilt trucks in January 2017.

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John G. Smith is the editorial director of Newcom Media's trucking and supply chain publications -- including Today's Trucking,, TruckTech, Transport Routier, and Road Today. The award-winning journalist has covered the trucking industry since 1995.

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