Road Machinery Diesel Engine Series
Road Machinery WP4.1N Diesel Engine
The Weichai WP4.1NQ series is a lightweight and compact diesel engine engineered for reliable performance in cargo trucks, dump trucks, sanitation trucks, mixer trucks, and truck-mounted cranes. With a 4.088-liter displacement and high-pressure common rail system, it ensures precise fuel control, strong power output, and reduced emissions compliant with Euro V and Euro VI standards. The engine delivers excellent fuel economy with minimum fuel consumption as low as ≤195 g/kW·h, supported by optimized shift scheduling and improved drivetrain efficiency. NVH-optimized design, noise-reduction flywheel housing, and controlled vibration offer a smooth and quiet driving experience. Manufactured using cast-aluminum components, the WP4.1NQ stands out for lightweight construction, long service life, and durability thanks to reduced wear of moving parts and enhanced crankshaft-flywheel-gear system longevity.
SALIENT FEATURES
Advanced combustion design
Engines equipped with High Pressure Common Rail System (HPCRS).
Specially designed Turbo Charger
Advanced electronic control.
Integrated exhaust after treatment devices consisting Diesel Oxidation Catalysts (DOC), Diesel Particulate Filters (DPF) and Selective Catalytic Reduction (SCR) catalysts
Engines complaint with latest emission norms.
Cooled Engine Exhaust Gas Re-circulation.
TECHNICAL INFORMATION
TECHNICAL INFORMATION
| Engine family | model | displacement（L） | cylinder-bore×stroke （mm） |
Valve per cylinder | Rated power/speed （kW/rpm） |
Max torque/speed （N.m/rpm） |
Technical route |
| WP4.1N | WP4.1NQ170E61 | 4.088 | 4-105×118 | 4 | 125/2600 | 600/1300-1900 | CR+EGR+DOC+DPF+SCR |
| WP4.1NQ190E61 | 140/2600 | 680/1300-1900 |
FAQ- ENGINE
Weichai is your all-around engine solution for commercial purposes. It will offer a quick understanding of the brand, product, and industry.