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Mercedes-Benz OM 471 12.8L Truck Engine Unit – Power, Precision, and Performance for Modern Heavy-Duty Transport
The Mercedes-Benz OM 471 12.8L engine is one of the most advanced and widely respected power units in the heavy-duty truck segment. Developed by Daimler for use in its Mercedes-Benz Actros and Arocs series, this inline 6-cylinder diesel engine delivers a unique combination of power, efficiency, durability, and emission control. Built for long-haul and demanding vocational applications, the OM 471 has become a benchmark in engine technology.
Engine Overview
The OM 471 is a 12.8-liter, inline 6-cylinder, four-stroke diesel engine equipped with turbocharging and intercooling systems. With multiple power variants ranging from approximately 422 hp to 530 hp and torque outputs reaching up to 2600 Nm, it offers a powerful and responsive driving experience under any load condition.
Designed to comply with stringent Euro VI emission standards, the OM 471 features state-of-the-art technologies such as X-PULSE fuel injection, asymmetric turbocharging, and an integrated exhaust aftertreatment system that includes SCR (Selective Catalytic Reduction), a Diesel Particulate Filter (DPF), and Diesel Oxidation Catalyst (DOC).
Technical Specifications
- Engine Type: Inline 6-cylinder, 4-stroke diesel
- Displacement: 12.8 liters (12,800 cc)
- Power Output: 422 hp to 530 hp (315 kW to 390 kW)
- Torque: Up to 2600 Nm at 1100 RPM
- Fuel Injection System: X-PULSE Common Rail with pressure booster
- Turbocharging: Asymmetric turbocharger
- Emission Control: Euro VI (EGR + SCR + DPF + DOC)
- Cooling System: Water-cooled with charge air cooling
- Compression Ratio: 18.3:1
Advanced Fuel Injection: X-PULSE Technology
At the core of the OM 471’s performance is the X-PULSE fuel injection system. This high-pressure common rail system features pressure boosters that allow fuel injection pressures up to 2700 bar, enabling fine control of fuel delivery timing and quantity. As a result, combustion is more efficient, quieter, and cleaner, directly reducing fuel consumption and emissions.
Multiple injection events per cycle and precise spray targeting improve atomization, reduce particulate formation, and enhance thermal efficiency. These improvements contribute to smoother engine operation and superior fuel economy in real-world conditions.
Asymmetric Turbocharging and Thermodynamics
The OM 471 uses an asymmetric turbocharger, which is a single-stage turbo system with an unequal flow distribution between the exhaust ports. This design reduces turbo lag and optimizes responsiveness at low engine speeds, particularly important for city driving and acceleration under load. Combined with a sophisticated exhaust gas recirculation (EGR) system, this approach enhances emissions performance without compromising drivability.
Additionally, the engine’s thermodynamic tuning ensures optimal combustion temperatures, reducing energy losses and helping the engine operate within ideal efficiency ranges across diverse driving cycles.
Emissions Control and Compliance
Meeting Euro VI standards, the OM 471 is equipped with an integrated exhaust aftertreatment module. This includes:
- EGR (Exhaust Gas Recirculation): Lowers NOx formation by cooling and reintroducing exhaust gases into the intake
- SCR (Selective Catalytic Reduction): Converts NOx into nitrogen and water using AdBlue
- DPF (Diesel Particulate Filter): Captures and burns particulate matter during regeneration
- DOC (Diesel Oxidation Catalyst): Converts CO and hydrocarbons into harmless gases
Together, these systems ensure that emissions remain well below legal limits without compromising power output or fuel efficiency.
Durability and Maintenance
The Mercedes-Benz OM 471 12.8L Truck Engine Unit is engineered for high durability and long operational life, with features such as:
- Reinforced cast iron cylinder block and aluminum alloy cylinder head
- Optimized crankshaft and camshaft profiles
- Low-friction piston and ring designs
- Extended oil change intervals and maintenance cycles
Mercedes-Benz offers remote diagnostics and service tracking through Fleetboard, making it easier to manage engine maintenance proactively. Predictive maintenance, combined with robust engine design, minimizes unexpected downtime and repair costs.
Applications
The Mercedes-Benz OM 471 12.8L Truck Engine Unit is primarily used in Mercedes-Benz heavy-duty trucks, including:
- Actros: For long-haul transport, offering comfort, efficiency, and high performance
- Arocs: Built for construction and off-road use, combining toughness and reliability
These trucks are deployed across a range of industries:
- International freight and logistics
- Construction and infrastructure
- Petroleum and bulk materials transport
- Emergency and municipal services
Performance Benefits
- Exceptional Fuel Economy: Optimized injection and turbocharging reduce fuel costs
- Low Emissions: Euro VI compliance with minimal AdBlue consumption
- High Torque at Low RPM: Excellent pulling power and fuel efficiency
- Smooth and Quiet Operation: Ideal for long-distance and urban deliveries
- Extended Service Life: Designed for 1 million kilometers or more with proper maintenance
Integration with Mercedes Powertrain Systems
The Mercedes-Benz OM 471 12.8L Truck Engine Unit is seamlessly integrated with the Mercedes-Benz PowerShift automated transmission and advanced cruise control systems, such as Predictive Powertrain Control (PPC). These technologies work together to optimize engine output, reduce unnecessary gear shifts, and leverage GPS-based data for maximum efficiency.
PPC allows the engine to anticipate hills, curves, and traffic conditions, adjusting speed and gear selection automatically. This results in smoother operation, reduced driver fatigue, and lower fuel consumption.
Mercedes-Benz OM 471 12.8L Truck Engine Unit
The Mercedes-Benz OM 471 12.8L engine is a powerhouse of innovation, blending advanced diesel technology with efficiency, reliability, and environmental responsibility. Whether transporting goods across continents or powering construction vehicles on rough terrain, the OM 471 provides dependable performance and industry-leading fuel economy.
With its cutting-edge engineering, reduced operating costs, and commitment to emission standards, the OM 471 remains a top choice for fleet operators who prioritize total cost of ownership, performance, and sustainability.
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