WP9H series engines for medium- and heavy-duty trucks

Compact structure, high reliability, high power performance and excellent economy.

Overview

First engine model originates from high-end Weichai engine platform products, integrating latest technologies, meeting Euro VI emission standards. Higher power performance, economy and reliability than competing products.

Power Rating

Units: US Metric

Maximum Power	350 hp257 kW
Minimum Power	310 hp228 kW
Maximum Torque / Speed	1700/(1100-1400) N·m / r/min

Emission Standards

Emissions

Euro VI

General

Series	WP9H
Fuel	Diesel
EngineType	Inline 6-cylinder, four-stroke engine
Cylinder Number	6
Valve Number	4
Bore	116 mm
Stroke	139 mm
Displacement	8.8 L
Aspiration	Turbocharged and intercooled
Compression Ratio	17.5:1
Combustion System	Electronically controlled high-pressure common-rail

Engine Dimensions (Approximate. Final dimensions dependent on selected options)

Length	1196 mm
Width	1010 mm
Height	1090 mm
Weight - Net Dry (Basic Operating Engine Without Optional Attachments)	815 kg

Remarks: Product parameters and pictures are for reference only; subject to change without notice.

Super-high reliability

Great engine reinforcement extent and great design parameter allowances. Engine undergoes bench test for more than 15,000h. Engine-powered vehicle undergoes road test for 50 million kilometers.
Service life exceeding 1.8 million kilometers/30,000 hours.

Modular design

The engines have 30% (or more) fewer parts than other engines compared to similar products. Fuel filter module integrates coarse filter and fine filter into one unit.
Oil filter module integrates oil filter, oil cooler, rotary filter, and water filter into one unit.
Integral cylinder head of compact design, incorporating intake pipe.

Light-weighted design

Engine weight only 815kg (Euro V). Due to enormous CAE analysis capability, high strength and reliability are ensured with design optimized.
A good many parts such as flywheel housing, water pump, oil sump, rocker arm cover, and intake pipe are made of plastic or aluminum alloy.

Intellectual control

ECU is independently developed by Weichai, notable for rapid response. High-accuracy air control system.
Multi-tier control strategy covering all operation conditions.

Excellent NVH performances

One-meter-distant noise level at rated power is less than 96dB(A), which is 2-3dB(A) lower than that of competing products. Use drum-shaped engine body skirt, with engine body strength increased, vibration dampened and noise greatly reduced.
In the rear-mounted gear chamber, high-accuracy gears and anti-gear gears operate smoothly further reducing mechanical noise.
Multiple times injection technology greatly reduces combustion noise.

Ultra-low fuel consumption

Minimum fuel consumption 185g/kW•h. Fuel consumption under general operation conditions is 3%-5% lower than that of competing products.
Low engine speed range for economical fuel consumption covers engine speed 950-1,450 r/min under general operation conditions of buses.

More powerful

With sufficient power ensured, smaller speed ratio rear axle can be selected to further reduce fuel consumption.

High adaptability

No power loss up to altitude 2,800 meters. Super low power loss under general operation conditions up to altitude 4,500 meters.
No start failure with ambient temperature below -20°C.

Model	Rated Power/ Speed （kW/rpm）	Maximum Torque / Speed （N·m/rpm）	Displacement （L）	Emission	Technique Route	Adaptable Vehicle
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