PACCAR Engines

PACCAR engines are designed to deliver industry leading performance, reliability, and fuel efficiency to Kenworth customers worldwide.   

The PACCAR MX meets the Environmental Protection Agency’s (EPA) 2013 emissions regulations and has accumulated over 50 million test miles in rigorous and severe conditions in North America. The PACCAR MX-13 is available with a horsepower range of 380hp-500hp and torque outputs up to 1,850 lb-ft with a displacement of 12.9 liters.  This power range, combined with excellent fuel efficiency, high reliability, durability, lightweight design and low cost of ownership makes the MX-13 an ideal choice for both over-the-road and vocational applications.

The medium duty PACCAR PX engines provide a proven best in class power to weight ratio, and excellent fuel economy.



The 12.9-liter PACCAR MX-13 engine is characterized by its combination of proven
technologies and state-of-the-art innovations that improve fuel economy. Power offerings are
expanded with the addition of a 500 horsepower rating with 1,850 lb-ft of torque. The new
PACCAR MX-13 engine’s common rail system maintains injection pressures of 2,500 bar,
which helps achieve the lowest possible fuel consumption, emission and noise levels. The
PACCAR MX-13 engine is designed to meet the demands of both linehaul and vocational
heavy-duty truck applications.



The 10.8-liter PACCAR MX-11 engine is a combination of proven technologies and state-of-the-art innovations that improve
fuel economy and durability. The new PACCAR MX-11 engine’s common rail system with injection pressures to 36,000 psi and
dual overhead cam design help achieve a more precise combustion process.

The PACCAR MX-11 engine is designed to be a high performance alternative to big block engines and still meet the demands of
the weight sensitive pickup and delivery, linehaul and vocational heavy-duty truck applications. Achieving the goal of the lowest
possible fuel consumption, highest durability, low emissions and noise levels is what the PACCAR MX-11 is all about.



The 8.9-liter PACCAR PX-9 engine has one of the highest power-to-weight ratios in its class,
with heavy-duty features like replaceable wet liners, roller cam followers, bypass oil filtration
and targeted piston-cooling.

Available in both medium and heavy-duty configurations this engine delivers the durability
and efficiency needed to lower operating expenses, reduce maintenance and increase



The 6.7-liter PACCAR PX-7 engine delivers superior performance, minimizes operational
costs and maximizes uptime for medium-duty customers. Reduced maintenance, long
service intervals and excellent fuel efficiency add up to a superior lifetime value.

The PACCAR PX-7 is available in horsepower ratings from 200 to 360hp and offers up to
800 lb-ft of torque.

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