Weichai Group

WP3N series bus engine

Product parameters

Mode Displacement
（L） Number of valves per cylinder Rated power/speed
(kW/rpm) Maximum torque/speed
(N·m/rpm Min. fuel consumption on external characteristic curve
(g/kW·h) Technical route Applicable model

WP3NQ140E50 2.97 4 103/3000 380/1400-2400 ≤205 CR+SCR 5.9-7.5m city bus
6-7m coach
7-8m
school bus

WP3NQ160E50 2.97 4 118/3000 480/1400-2300 ≤205 CR+SCR 5.9-7.5m city bus
6-7m coach
7-8m
school bus

WP3NQ158E62 2.97 4 116/2800 500/1300-2200 ≤200 CR+DOC+DPF+Hi-SCR 6-7.7m city bus
7-8.5m
school bus

WP3NQ170E62 2.97 4 125/2800 520/1400-2100 ≤200 CR+DOC+DPF+Hi-SCR 6-7.7m city bus
7-8.5m
school bus

Product advantages

Reliability

The wet cylinder liner, gantry type drum engine block, integral cast iron cylinder head are adopted; and the new design of moving parts such as piston, connecting rod, crankshaft and bearing shell is adopted. B10 life is 800,000km.

WEICHAI premium suppliers develop the relevant products according to the high reliability requirements in the heavy truck industry.

The engine block and the cylinder head are casted and machined by WEICHAI, ensuring high consistency.

Economy

Min. fuel consumption: 200g/(kW•h).

Power performance

Power: 103kW~125kW, maximum torque: 520N•m/(1400~2100)r/min.

The engine has higher torque and higher power when compared with competing products of same displacement.

Comfort

The rear-mounted gear chamber, enclosed flywheel housing, and plastic cylinder head cover are adopted, which effectively reduce noise, making the rated noise 4dB(A) lower than that of competing products.

The standard engine block stiffening plate is used, which ensures a better engine vibration reduction performance than that of competing products. The optional secondary balance mechanism can reduce engine vibration further.

Adaptability

The modular design, compact layout of peripheral accessories, and various optional structures ensure a wider range of application.

The oil filter, alternator, starter and other parts of N platform are universal, ensuring the convenience of maintenance.

Mode	Displacement （L）	Number of valves per cylinder	Rated power/speed (kW/rpm)	Maximum torque/speed (N·m/rpm	Min. fuel consumption on external characteristic curve (g/kW·h)	Technical route	Applicable model
WP3NQ140E50	2.97	4	103/3000	380/1400-2400	≤205	CR+SCR	5.9-7.5m city bus 6-7m coach 7-8m school bus
WP3NQ160E50	2.97	4	118/3000	480/1400-2300	≤205	CR+SCR	5.9-7.5m city bus 6-7m coach 7-8m school bus
WP3NQ158E62	2.97	4	116/2800	500/1300-2200	≤200	CR+DOC+DPF+Hi-SCR	6-7.7m city bus 7-8.5m school bus
WP3NQ170E62	2.97	4	125/2800	520/1400-2100	≤200	CR+DOC+DPF+Hi-SCR	6-7.7m city bus 7-8.5m school bus