WP4.6N series bus engine

Weichai bus engines, with the displacement ranging from 2.3L to 12L and the power ranging from 88kW to 338kW meet Euro V, Euro VI and other emission standards, and are applicable to various buses with a length greater than 5m such as school buses, passenger buses, private buses, touring buses, public buses, hybrid electric buses, and special buses. These new-generation power products (RA/WP2.3N/WP3N/WP4.1N/WP4.6N) are applicable to rural public buses, minibuses, long-nose school buses, high-end MPVs, European light buses, and characterized by high reliability, strong power, fuel saving and environmental protection.

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 4.6 4 162/2300 800/1200-1800 193 Common rail + SCR 8–8.5M passenger buses、9–11M public buses、school buses
WP4.6NQ220E61 4.6 4 162/2300 800/1200-1800 193 EGR+DOC+DPF+SCR 8–8.5M passenger buses、9–11M public buses、school buses


Product advantages

Power performance

  • For WP4.1N engine, its power per liter is 34kW/L and its torque per liter is 166N.m/L; for WP4.6N engine, its power per liter is 35kW/L and its torque per liter is 174N.m/L.


  • B10 life is 800,000km.


  • The standard Weichai brake system — WCBS has a braking power up to 70kW, ensuring higher power, shorter braking distance, and better safety. Intelligent electronic control: Weichai ECU is used.


  • The heights of rear PTO and fan are adjustable, and the structure for equipping multiple alternators and A/C is optional; WP4.1N and WP4.6N parts are highly universal.
  • Good comfort: The vibration damping web and the secondary balance mechanism guarantee low vibration and noise.

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