WP3N series truck engine

At present, Weichai truck engines, with the displacement ranging from 2.3L to 13L and the power ranging from 70kW to 426kW, meet Euro II, Euro Ⅲ, Euro Ⅳ, Euro V, Euro VI,emission standards, and are applicable to heavy-duty tractors, middle-duty trucks, light-duty trucks, and off-road trucks. These engines are characterized by high reliability, strong power, fuel saving and environmental protection.

WP4.1N series truck engine

Product portfolio

Mode Displacement
Number of valves per cylinder Rated power/speed
Maximum torque/speed
Min. fuel consumption on external characteristic curve
Technical route Applicable model
WP4.1NQ170E50 4.088 4 125/2600 600/1300-1900 195 Common rail + SCR
Trucks、dump trucks
WP4.1NQ190E50 4.088 4 140/2600 680/1300-1900 195 Common rail + SCR
WP4.1NQ170E61 4.088 4 125/2600 600/1300-1900 195
Common rail + EGR + DOC + DPF + SCR
Trucks、dump trucks
WP4.1NQ190E61 4.088 4 140/2600 680/1300-1900 195
Common rail + EGR + DOC + DPF + SCR


Product advantages

  • Emission standards: China V and China VI.
  • Technical route: The electronically controlled high-pressure common rail system is used to ensure precise control.
  • Comfort: The customized development of NVH ensures low noise and vibration.
  • Light weight: Its applies a large number of cast aluminum parts and is the lightest one among those products of same power.
  • Small size: The engine is smaller than competing products in size, ensuring the easy assembling in OEM.
  • Electronic control system: The independent ECU control system with functions developed for light-duty trucks ensures good adaptability.
  • Low-pressure circuit: It ensures electronically controlled fuel pumping, good low temperature starting performance, and strong fuel adaptability.
  • Intake system: The four-valve structure guarantees high intake efficiency and more efficient combustion.
  • Cooling system: The Weichai electromagnetic clutch fan and silicone oil clutch fan are optional, which ensure good cooling effect.

    More safe and reliable

  • The movement speed of moving parts is reduced, and the movement time is prolonged.
  • The wear of friction pairs per unit time is reduced.
  • The service life of the crankshaft flywheel system and gear system is prolonged.
    Power performance
  • Power: 103kw~118kw, maximum torque: 480Nm/(1400~2300)r/min.
  • The engine has higher torque and higher power when compared with competing products of same displacement.
    Better economy
  • The speed ratio of drivetrain is reduced, improving transmission efficiency.
  • Fuel system: The fresh air system guarantees good reliability and excellent
  • Economy.
  • The driver‘s shift schedule is improved, reducing fuel consumption.
  • The rear PTO is optional.
    More comfortable
  • The high frequency torsional vibration zone of the engine is avoided.
  • The noise reduction flywheel housing and the domestic advanced anechoic chamber are used to reduce noise.

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