In today’s global heavy-duty engine market, competition has evolved beyond raw horsepower to encompass efficiency, emissions, and lifecycle reliability. As a leading Chinese manufacturer, Yuchai Group continues to set benchmarks in engine innovation.
Among its newest generation of China VI-compliant engines, the YCK08-60 and YCK09-60 stand out as flagship models designed for trucks, buses, and construction machinery.This article provides an in-depth, factual comparison between these two engines and benchmarks them against other global heavyweights such as Cummins, Weichai, and Mercedes-Benz.
1.Core Design Comparison
|
Technical Item |
Yuchai YCK08-60 |
Yuchai YCK09-60 |
|---|---|---|
|
Displacement |
7.8L |
8.9L |
|
Cylinder Block Material |
High-strength cast iron |
High-toughness alloy cast iron |
|
Bore × Stroke |
110mm × 135mm |
115mm × 145mm |
|
Compression Ratio |
17.5:1 |
18.0:1 |
|
Turbocharging System |
Single-stage turbo + intercooler |
Two-stage variable turbo + high-efficiency intercooler |
|
Fuel Injection System |
BOSCH Common Rail 1800 bar |
BOSCH Common Rail 2000 bar |
|
Control System |
Yuchai i-HEC |
Yuchai i-HEC+ Smart Combustion Control |
2.Power and Fuel Efficiency Comparison
|
Specification |
YCK08-60 |
YCK09-60 |
Cummins ISL9 |
Weichai WP10H |
Mercedes OM470 |
|---|---|---|---|---|---|
|
Max Power |
350 HP |
400 HP |
380–400 HP |
375–430 HP |
400 HP |
|
Max Torque |
1550 N·m |
1800 N·m |
1700 N·m |
1750 N·m |
1900 N·m |
|
Fuel Consumption |
185 g/kWh |
178 g/kWh |
182 g/kWh |
185 g/kWh |
180 g/kWh |
|
Noise Level |
Low |
Low |
Medium |
Medium |
Low |
Technical Insight:
· YCK08-60 prioritizes fuel economy and long-distance stability, ideal for logistics fleets.
· YCK09-60 improves combustion efficiency by 4% over YCK08-60, becoming one of Yuchai’s earliest engines to meet the China VI B emission standard.
· Compared with Cummins ISL9, YCK09-60 achieves similar power with lower operational fuel cost.
· Mercedes OM470 offers premium smoothness, but its purchase and service costs are considerably higher.
3.Maintenance and Durability
|
Aspect |
YCK08-60 |
YCK09-60 |
Cummins ISL9 |
Weichai WP10H |
|---|---|---|---|---|
|
Overhaul Interval |
≥ 1.0 million km |
≥ 1.2 million km |
1.0 million km |
0.9 million km |
|
Parts Compatibility |
High |
High |
Medium |
High |
|
Maintenance Cost |
Low |
Low |
Medium |
Moderate |
|
After-Sales Support |
Global + localized |
Global + localized |
Global |
Mainly domestic |
Conclusion:
Both YCK engines excel in low maintenance costs and high parts compatibility, thanks to Yuchai’s modular design.
The YCK09-60 reduces service time by 15% compared with older models — a major advantage for overseas users managing their own fleets.
4. Emission and Environmental Technology
Both YCK engines comply with China VI / Euro VI emission standards using:
-
- EGR + DOC + DPF + SCR four-in-one system
- Closed-loop fuel injection monitoring
- Yuchai i-HEC intelligent combustion algorithm
While brands like Cummins and Mercedes-Benz rely on imported post-treatment modules (increasing cost and complexity), Yuchai integrates a domestically optimized system that balances reliability with affordability.
|
Application |
Recommended Model |
Key Advantages |
|---|---|---|
|
Highway Transport |
YCK09-60 |
High torque and acceleration for long hauls |
|
City Bus / Passenger Coach |
YCK08-60 |
Quiet, fuel-efficient operation |
|
Construction & Mining Equipment |
YCK09-60 |
Enhanced durability and dust/vibration protection |
|
Tractor & Heavy Logistics |
YCK09-60 |
Strong continuous output and fuel savings |
YCK08-60
YCK09-60
|
Evaluation Area |
Yuchai YCK09-60 |
Cummins ISL9 |
Mercedes OM470 |
Weichai WP10H |
|---|---|---|---|---|
|
Power & Torque |
★★★★★ |
★★★★☆ |
★★★★★ |
★★★★☆ |
|
Fuel Economy |
★★★★★ |
★★★★☆ |
★★★★☆ |
★★★★ |
|
Maintenance Cost |
★★★★★ |
★★★★ |
★★☆ |
★★★★ |
|
Global Support |
★★★★☆ |
★★★★★ |
★★★★★ |
★★★☆ |
|
Value for Money |
★★★★★ |
★★★★ |
★★☆ |
★★★★ |
Verdict:
Yuchai’s YCK09-60 represents a breakthrough for Chinese heavy-duty diesel engines — combining world-class emission compliance, exceptional fuel economy, and cost efficiency that rivals leading global brands.
Conclusion
Through years of research, testing, and production refinement, Yuchai’s YCK08-60 and YCK09-60 have become flagship models symbolizing the next generation of efficient, durable, and eco-friendly diesel engines.
Whether in domestic fleets or international operations, these engines deliver the balance of power, precision, and reliability that defines Yuchai’s global reputation.
Yuchai — Powering the Future with Efficiency, Strength, and Reliability.
Media Contact
Company Name: Nanning Nazhihui Import & Export Trade Co., Ltd.
Email: Send Email
Country: China
Website: https://www.nzhengine.com/
