Improved MX engines and proprietary axle coming from Paccar

by Truck West

LAS VEGAS, Nev. – Landon Sproull, assistant vice-president of Paccar, announced the 2017 MX-13 and MX-11 engines would offer improved power, torque and fuel efficiency, increasing uptime and making Paccar engines ‘much more profitable to operate.’

“The Paccar MX-13 and MX-11 engines are designed to deliver optimum performance, durability, fuel economy, and the lowest total cost of ownership for our customers.” said Sproull during the American Trucking Associations’ Management Conference and Exhibition Oct. 1 in Las Vegas, Nev.

The MX-13 engine will boast an increased output to 510 hp and 1,850 lbs/ft of torque. The MX-11 engine adds a new 335 hp and 1,150 lb/ft torque rating in the lower end power range, with peak torque achieved at 900 RPMs for the majority of engine ratings.

Sproull said the engines are ‘greenhouse gas compliant for 2017,’ and that the engine is quite new in terms of the conventions themselves.

Paccar’s MX engines include a new single cylinder air compressor, viable displacement oil pump and variable speed coolant pump, which offers customers with fuel economy gains compared to previous engine designs.

The MX-13 and MX-11 utilize a single canister aftertreatment system that reduces weight by 100 lbs, improves serviceability and lengthens service intervals.

“Paccar will have 135,000 Paccar MX engines in operation in North America by year end. Nearly 50% of Kenworth and Peterbilt trucks delivered to customers in North America this year will be powered by a Paccar MX engine,” said Sproull. “This strong adoption level is a testament to the outstanding performance, durability, fuel economy and low cost of service delivered by the Paccar MX-13 and MX-11 engines.”

MX-13 is 50 lbs lighter, due to weight coming out of the turbo and other accessories of the engine.


The company also unveiled its proprietary tandem axle, saying it is the lightest and most efficient axle in its class.

Sproull said the new axle is unique because of its thru-shaft design, eliminating additional gears, simplifying power distribution and increasing efficiencies.

The axle is designed to improve operating efficiency, is rated at 40,000 lbs with a gross combination weight of 80,000 lbs.

“Paccar’s axle reduces vehicle weight by up to 150 lbs, and provides improved fuel economy,” said Sproull.

The axle offers ratios from 2.47 to 3.70 with engine torque compatibility up to 1,650 ft/lbs and a multi-torque rating compatibility up to 1,750 ft/lbs.

With a warranty for five years or 750,000 miles, the new tandem axle will be available in Kenworth and Peterbilt customers in 2017.

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