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Products & ServiceBus engines

WP4.6N series bus engine

Product parameters

Mode Displacement
Number of valves per cylinder Rated power/speed
Maximum torque/speed
Min. fuel consumption on external characteristic curve
Technical route Applicable model
WP4.6NQ220E50 4.58 4 162/2300 800/1200-1800 ≤200 CR+SCR 8-9m city bus
8-8.5m coach
school bus
WP4.6NQ240E62 4.58 4 177/2300 850/1300-1600 ≤188 CR+DOC+DPF+Hi-SCR 8-9m city bus
8-8.5m coach
school bus

Product advantages

  • Emission standards: Euro V and Euro 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.
  • 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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    R & D

    20000 +
    Global R & D personnel
    R & D institutions in five countries, ten regions


    • 5,000,000 units
    • 22-10000Ps
    • 200 million kilowatts
    • Application for all markets