The WP10H400E50 engine represents the pinnacle of modern diesel engineering, delivering 400 horsepower of reliable, efficient power for the most demanding heavy-duty applications. As a flagship powerplant in the HOWO lineup, this 9.5-liter, inline 6-cylinder engine combines advanced common-rail fuel injection with a robust, durable design that ensures exceptional performance, fuel economy, and longevity. Whether you are hauling heavy loads across rugged terrain or navigating demanding construction sites, the WP10H400E50 provides the torque, responsiveness, and dependability that professional drivers and fleet operators demand. As a critical Howo/Sitrak truck parts solution, this engine is engineered to meet Euro V emission standards while delivering class-leading power and efficiency, making it the definitive choice for modern heavy-duty trucks.
The WP10H400E50 is more than just an engine – it is the powerhouse that drives your HOWO truck’s performance, productivity, and profitability. With a displacement of 9.5 liters and a maximum output of 294 kW (400 horsepower), this engine delivers the muscle needed for heavy hauling, construction, and long-haul transportation[reference:0][reference:1]. Its peak torque of 1900 N·m, available from 1200 to 1300 rpm, ensures strong pulling power right when you need it most, whether climbing steep grades or accelerating with heavy loads[reference:2]. The engine’s compact, inline 6-cylinder design with 4 valves per cylinder offers a perfect balance of power density and fuel efficiency[reference:3][reference:4]. The WP10H400E50 is engineered to deliver reliable, consistent performance that keeps your fleet moving and your business thriving.
400 HP
Maximum Power
1900 N·m
Peak Torque
9.5 L
Displacement
Euro V
Emission Standard
The WP10H400E50 is manufactured to the highest OEM standards, incorporating advanced technologies that deliver exceptional performance, durability, and efficiency. Below are the comprehensive technical specifications for this powerhouse engine.
| Parameter | Specification | Detail |
|---|---|---|
| OEM Number | WP10H400E50 | Exact Match |
| Engine Model | WP10H400E50 | HOWO Genuine |
| Brand | HOWO / Weichai | Original Equipment |
| Engine Type | Inline 6‑cylinder, 4‑stroke | Turbocharged & intercooled |
| Displacement | 9.5 L | Bore 116 mm × Stroke 150 mm |
| Maximum Power | 294 kW (400 HP) | @ 1900 rpm |
| Maximum Torque | 1900 N·m | @ 1200–1300 rpm |
| Valves per Cylinder | 4 | High efficiency |
| Compression Ratio | 17.5:1 | Optimized combustion |
| Fuel System | Common Rail + SCR | Precise fuel control |
| Emission Standard | Euro V | Clean and efficient |
| Minimum Fuel Consumption | ≤185 g/kW·h | Excellent economy |
| Weight (Dry) | 815 kg | Compact and robust |
| Dimensions (L×W×H) | 1196 × 1026 × 1133 mm | Approximate values |
| Noise Level | 95.8 dB | @ 1 meter |
| Warranty | 12 Months | Manufacturer Guarantee |
The WP10H400E50 is built on a robust, reliable platform that has been refined through years of real-world testing and continuous innovation. Its compact, inline 6-cylinder design with 4 valves per cylinder delivers exceptional power density while maintaining excellent fuel efficiency[reference:5][reference:6]. The engine features a high-pressure common-rail fuel system with an advanced Electronic Control Unit (ECU), ensuring precise fuel delivery and optimal combustion under all operating conditions[reference:7]. This results in lower fuel consumption, reduced emissions, and smoother, more responsive performance. The engine’s turbocharger and charge-air cooling system maximize air density, allowing for greater power output and improved efficiency across the entire operating range.
Durability is at the core of the WP10H400E50‘s design. The engine features a high-strength cylinder block and forged steel crankshaft, ensuring long-term reliability even under the most extreme loads. The advanced cooling system and optimized oil circulation maintain consistent operating temperatures, reducing wear and extending engine life. With a design life exceeding 1.8 million kilometers, the WP10H400E50 is built to keep your fleet on the road and your business moving forward[reference:8]. The engine’s robust construction and high-quality materials ensure that it can withstand the rigors of heavy-duty applications, from long-haul trucking to demanding construction and mining operations.
The WP10H400E50 engine is specifically designed for HOWO heavy-duty trucks, including T7H, TX, and other models that demand reliable, powerful performance[reference:9]. It is commonly used in 6×4 and 8×4 configurations for dump trucks, tractors, and other heavy-duty applications[reference:10]. The engine’s versatile design makes it suitable for a wide range of applications, including coal and port transportation, construction, mining, and long-haul logistics[reference:11].
To confirm fitment, always cross-reference the OEM number on your existing engine with WP10H400E50. If they match, this component will integrate seamlessly with your vehicle’s drivetrain and chassis. Keeping this engine in your spare parts inventory enables rapid replacement and minimizes downtime, ensuring that your fleet remains operational and productive.
HOWO T7H
Primary Fitment
HOWO TX
Also Compatible
Heavy-Duty
Dump / Tractor
Direct Replacement
No Modifications
Upgrading to or replacing with the WP10H400E50 engine delivers immediate and substantial performance improvements. The 400 horsepower and 1900 N·m of torque provide the power and pulling capability needed to handle the heaviest loads with ease[reference:12][reference:13]. The broad torque curve, with peak torque available from 1200 to 1300 rpm, ensures strong acceleration and excellent grade-climbing ability, reducing the need for frequent downshifts and improving overall driveability.
The advanced common-rail fuel system and optimized combustion process result in lower fuel consumption, helping to reduce operating costs and improve profitability. The engine’s Euro V emission compliance ensures that your vehicle meets the latest environmental standards, reducing your carbon footprint and ensuring compliance with regulations[reference:14]. The robust construction and high-quality materials ensure long-term reliability, reducing maintenance costs and minimizing downtime. For fleet operators, the WP10H400E50 offers the perfect combination of power, efficiency, and durability, helping to keep your fleet moving and your business profitable.
Installing or servicing the WP10H400E50 engine requires professional expertise and proper equipment. Begin by safely removing the old engine and thoroughly cleaning the engine bay. Inspect all mounting points, transmission connections, and cooling system components for wear or damage.
When installing the new engine, ensure that all bolts and fasteners are torqued to the manufacturer’s specifications. Refill with the recommended grade of engine oil and coolant, and prime the fuel system before starting the engine. After installation, check for any leaks and verify that all sensors and electronic connections are properly secured. Follow the manufacturer’s recommended maintenance schedule, including regular oil and filter changes, fuel filter replacement, and cooling system service. With proper care, the WP10H400E50 will provide years of reliable, powerful performance.
Pro Tip: When replacing the engine, always use genuine HOWO or Weichai filters, belts, and fluids. The WP10H400E50 is designed to perform optimally with OEM-specified components; using non-genuine parts can compromise performance and reliability.
Genuine HOWO and Weichai components are engineered to the highest standards, and the WP10H400E50 engine is no exception. Aftermarket engines often use inferior components, inconsistent manufacturing processes, or lower-quality materials, leading to reduced performance, increased fuel consumption, and premature failure. The WP10H400E50 is manufactured using the same materials and processes as the original equipment, guaranteeing a perfect fit and reliable performance.
By choosing the WP10H400E50, you benefit from rigorous testing and quality control, including durability testing, thermal cycling, and performance validation. This ensures that the engine meets the demanding requirements of heavy-duty trucking. Moreover, genuine parts are backed by a comprehensive warranty and supported by HOWO’s and Weichai’s global networks, giving you confidence in your purchase and long-term peace of mind.
OEM Authentic
Factory Quality
Long Service
Extended Life
Global Standard
Trusted Worldwide
Q: Which vehicles use the WP10H400E50 engine?
A: The WP10H400E50 is primarily used in HOWO T7H, TX, and other heavy-duty trucks, as well as in various Sinotruk and Weichai-powered commercial vehicles[reference:15].
Q: What are the symptoms of a failing engine?
A: Loss of power, excessive smoke, unusual noises, increased fuel consumption, and overheating are common indicators that an engine may need service or replacement.
Q: What fuel does the WP10H400E50 use?
A: The WP10H400E50 is a diesel engine designed for use with high-quality diesel fuel that meets the required specifications[reference:16].
Q: How do I verify the correct engine model?
A: Check the OEM number on your existing engine. If it matches WP10H400E50, this is the exact replacement. Consult your vehicle’s parts manual for additional confirmation.
Order your WP10H400E50 Engine today! Explore our complete selection of genuine HOWO and Sinotruk engine components at Howo/Sitrak truck parts and keep your truck performing at its peak.
The WP10H400E50 Engine from HOWO is a testament to precision engineering and uncompromising quality. By choosing this genuine component, you ensure that your truck delivers the power, efficiency, and reliability that professional drivers and fleet operators demand. Whether you are replacing a worn engine or upgrading your vehicle, this engine offers the performance, durability, and exact fit required for modern heavy-duty trucks. Trust HOWO – the benchmark for excellence in heavy-duty truck components – and experience the difference that genuine quality makes.
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