Paccar MX-11 10.8L Engine Unit
PACCAR MX-11 10.8L Engine Unit – Mid-Displacement Efficiency and Performance for Heavy-Duty Applications
The Paccar MX-11 10.8L Engine Unit is a mid-displacement inline six-cylinder diesel engine engineered for superior performance, fuel efficiency, and reduced weight in heavy-duty trucking applications. Designed and manufactured by PACCAR Inc.—a global leader in the development of premium truck engines—the MX-11 is widely used in Kenworth, Peterbilt, and DAF trucks for regional hauling, vocational operations, and long-distance transportation where optimized fuel economy and payload capacity are critical.
The MX-11 strikes an optimal balance between power and weight, offering significant savings in operating costs without compromising on torque, durability, or driver comfort. It is part of PACCAR’s commitment to sustainable, efficient, and reliable power solutions for the commercial vehicle sector.
Engine Overview
The Paccar MX-11 10.8L Engine Unit was introduced as a lighter-weight alternative to the larger MX-13, offering fleets the benefits of high torque output and robust engine design with a lower overall weight. Weighing approximately 400 pounds (181 kg) less than the MX-13, the MX-11 helps increase payload capacity and improve vehicle handling. Its compact design makes it ideal for applications in both on-road and vocational segments.
The engine is available in multiple power ratings ranging from 355 to 445 horsepower and torque outputs of up to 1,700 lb-ft (2,305 Nm). It is particularly well-suited for regional and city deliveries, tankers, bulk transport, refuse trucks, and municipal vehicles where weight and maneuverability are key considerations.
Technical Specifications
- Engine Type: Inline 6-cylinder, 4-stroke diesel
- Displacement: 10.8 liters (10,800 cc)
- Power Output: 355–445 hp (265–332 kW)
- Maximum Torque: 1,250–1,700 lb-ft (1,695–2,305 Nm)
- Fuel Injection System: High-pressure Common Rail up to 2,500 bar
- Turbocharging: Variable Geometry Turbocharger (VGT)
- Emission Compliance: EPA 2021 / Euro 6
- Aftertreatment System: SCR, DPF, DOC, and limited EGR
- Cooling System: Water-cooled with charge air cooling
Performance and Efficiency
The PACCAR MX-11 is engineered to deliver consistent torque at low RPMs, which improves drivability and reduces fuel consumption. It excels in start-and-stop urban operations as well as in steady-state highway driving. The engine’s high-pressure common rail injection system and advanced fuel mapping ensure optimal combustion, providing:
- Smooth acceleration
- Lower engine noise and vibration
- Efficient power delivery across the speed range
Fuel economy gains of 2–4% have been observed in mixed driving conditions compared to larger displacement engines, making the MX-11 an ideal powerplant for weight-sensitive and fuel-conscious fleets.
Emissions and Environmental Compliance
The MX-11 meets stringent EPA 2021 and Euro 6 emission standards through a combination of:
- Selective Catalytic Reduction (SCR): Reduces nitrogen oxide (NOx) emissions
- Diesel Particulate Filter (DPF): Captures and regenerates soot particles
- Diesel Oxidation Catalyst (DOC): Converts harmful gases into less toxic forms
- Limited Exhaust Gas Recirculation (EGR): Enhances emissions control with minimal impact on engine performance
PACCAR’s fully integrated aftertreatment system ensures that emissions are minimized while allowing for long service intervals and low maintenance requirements.
Durability and Maintenance
Despite its smaller displacement, the MX-11 shares many of the same heavy-duty components found in the larger MX-13 engine, including:
- Compacted Graphite Iron (CGI) engine block for reduced weight and increased strength
- Forged steel crankshaft and hardened cylinder liners
- Robust valve train and cooling systems designed for extended use
Maintenance features include:
- Extended oil and fuel filter change intervals (up to 75,000 miles or 120,000 km)
- Simple access to service points
- Advanced diagnostics and over-the-air updates
- Remote monitoring via PACCAR Connect telematics platform
The engine is backed by a comprehensive warranty and supported by a global network of authorized dealers and service centers.
Applications and Compatibility
The Paccar MX-11 10.8L Engine Unit powers a wide range of Class 8 vehicles, including:
- Kenworth T680, T880
- Peterbilt 567, 579
- DAF CF and XF Series (Europe)
Ideal for the following applications:
- Regional haulage and intercity transport
- Vocational fleets such as dump trucks, mixers, and utility vehicles
- Urban and municipal services including refuse and recycling trucks
- Tanker and bulk material hauling
Its light weight and fuel-efficient operation make it a top choice for fleets looking to improve payload efficiency and reduce emissions.
Key Advantages
- Lightweight Construction: Reduces tare weight and increases payload
- Fuel Efficient Design: High combustion efficiency and intelligent fuel mapping
- Quiet Operation: Low noise profile for enhanced driver comfort and urban suitability
- High Torque Output: Up to 1,700 lb-ft ensures strong performance under load
- Low Maintenance Costs: Long service intervals and simplified engine design
Paccar MX-11 10.8L Engine Unit
The PACCAR MX-11 10.8L engine unit is a smart choice for commercial fleets and truck operators who prioritize fuel economy, lower emissions, and high reliability without the need for maximum horsepower. Its compact design, lighter weight, and intelligent engineering deliver measurable benefits in a broad range of transport applications.
From urban delivery routes to regional freight hauls, the MX-11 stands out as a flexible, efficient, and environmentally responsible engine. For operators seeking reduced operating costs, improved payload, and superior serviceability, the MX-11 offers a proven solution.
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