Details
Weichai 8170ZC720-2 Marine Propulsion Engine: Commercial Power and System Integration
The Weichai 8170ZC720-2 is a proven medium-speed marine propulsion engine developed for commercial vessels requiring reliable power, fuel efficiency, and long-term operational durability. Delivering 720 HP (529kW) at 1200RPM, this 8-cylinder marine diesel engine belongs to the well-established Weichai 8170 series and has earned a reputation for dependable performance in fishing fleets, cargo vessels, workboats, and coastal transportation applications.
As a leading China marine diesel engine supplier, HekoPower provides genuine Weichai marine engines supported by technical consultation, spare parts supply, export logistics, and after-sales service. For vessel owners seeking a balance between operating economy and propulsion power, the Weichai 8170ZC720-2 remains a practical and cost-effective solution.
Tech Specs of Weichai 8170ZC720-2
General Engine Data
Engine Model: Weichai 8170ZC720-2
Cylinder Count: 6 / 8 Cylinders in Line
Engine Type: 4-stroke, water cooled, in-line, turbocharged and aftercooled
Total Engine Displacement: 27.24 L / 36.32 L
Bore * Stroke: 170×200 (mm)
Dimensions L×W×H) / net weight: L6 2463×1200×1650 (mm) / 3100kg; L8 2650×1040×1818 (mm) / 3800kg
Key Performance Data
Rated Power: 530 kW / 720 HP
Rated Speed: 1200 RPM
Idle Speed: 450-650 RPM
Minimum fuel consumption rate: 197 g/kW.h
Oil consumption rate: ≤0.5 g/kW.h
Torque reserve: 20-34%
More Technical Data
Certification: IMO Tier II
Aspiration: turbocharged and aftercooled
Starting system: Gas/Electrical
Rotation(facing the flywheel) : Counter-clockwise
Fuel system: Mechanical pump
Power rating: P1
Noise: ≤105 dB(A)
Comparative Analysis within the Weichai 8170 Series
Selecting the right marine power solution depends heavily on your vessel's duty cycle. Homogenous catalog numbers often cause confusion, but matching the appropriate model variant to your operational requirements prevents premature component wear and excessive fuel use.
Weichai 8170ZC720-2 vs 8170ZC600-1
The primary operational distinction between these two configurations centers on rated operational speed and torque distribution across varying engine speeds.
The 8170ZC600-1 relies on a lower 1000 RPM threshold to deliver 441kW (600 HP). This design works well for static or high-load displacement hulls requiring a massive, slow-turning propeller.
The Weichai 8170ZC720-2 utilizes a 1200RPM marine engine configuration to achieve its 530kW rating. This extra 200 RPM alters the turbocharger boost threshold, allowing the 720HP marine engine to generate a more responsive torque profile across its mid-to-high operational bands. This responsiveness makes it a highly versatile Weichai propulsion engine for workboats that encounter rapidly shifting current loads.
Weichai 8170ZC720-2 vs 8170ZC818-5Weichai 8170ZC720-2 vs 8170ZC818-5
When comparing the 720-2 engine to higher-output models like the 818 HP variants, the primary focus shifts to duty-cycle durability and structural longevity.
The 818 HP models operate at 1350 to 1500 RPM, categorizing them for intermittent or heavy duty cycles rather than continuous operation. Running at higher engine speeds increases thermal loads on the cylinder liners and increases maximum cylinder pressure.
The Weichai 8170ZC720-2 remains firmly within the P1 continuous duty class. Its mechanical engineering parameters are tailored for unlimited running hours at full load, with an expected annual working time ranging from 5,000 to 8,000 hours. The 1200 RPM design keeps mechanical piston speeds within highly reliable limits, positioning it as an ideal 720hp continuous duty marine engine for long-distance transport fleets.
Real-World Vessel Application Scenarios
The 8170ZC720-2 propulsion engine provides real-world performance benefits tailored to specific hull designs and commercial operating environments.
Propulsion Efficiency for Commercial Trawlers
As a reliable Weichai fishing vessel engine, this model addresses the complex power demands of deep-sea trawling. During active trawling, a fishing vessel encounters significant drag from deployment gear and heavy nets, which pulls the hull down into high-resistance operation.
The mechanical fuel injection pump system on this Weichai 8170 marine diesel engine provides direct throttle response and a stable torque curve at lower hull speeds. This helps prevent engine lugging or exhaust overheating when working against heavy sea currents.
Operational Advantages for Coastal Cargo Ships
For operators seeking a Weichai cargo vessel engine, managing fuel logistics over extended voyages is crucial for maintaining profitability. The 36.32L displacement design achieves an efficient minimum fuel consumption rate of ≤ 197 g/kW·h.
Its specialized "one cylinder, one head" design allows ship crews to easily complete inspections or handle isolated maintenance tasks while docked at coastal supply terminals, minimizing unbilled downtime.
Heavy Towing Capabilities for Tug Boats and Engineering Craft
Tug boats require rapid throttle adjustments and dependable bollard pull capacity. The 8-cylinder inline architecture of this genuine Weichai marine engine delivers excellent power balance, minimizing heavy hull vibrations during towing transitions.
Its pulse-conversion turbocharger system reacts quickly to sudden loads, providing the necessary exhaust pressure to step up propulsion power safely when maneuvering alongside larger cargo vessels.
Engineering Integration and Installation Standards
Properly integrating an engine into a vessel's hull infrastructure determines its long-term operational lifespan and performance consistency. As your marine diesel engine exporter, HekoPower provides the precise technical data necessary to support your shipyard's fabrication and alignment needs.
Mechanical Footprint and Structural Foundation
The physical layout of the Weichai 8170ZC720-2 engine dimensions measures 2577mm in length, 1117mm in width, and 1844mm in height, with a dry bobtail weight of 3600 kg. Ship builders must construct a rigid engine bed utilizing specialized steel girders aligned with the vessel's longitudinal framing.
The nodular iron crankshaft features a balanced 6-counterweight layout that reduces secondary inertia forces. However, it still requires precise chocking or flexible multi-point mounting isolators to maintain correct alignment with the gearbox flange.
Fluid Piping and Exhaust Backpressure Thresholds
Proper fluid and exhaust plumbing prevents premature component wear and power loss.
- Air Intake Requirements: The intake system requires a clean, unobstructed air supply pipe diameter of at least 139mm to prevent air starvation in the turbocharger.
- Exhaust System Design: The exhaust piping must utilize a minimum diameter of 208mm. Keep piping bends below a 40 degrees angle to stay well within the engine's backpressure limits.
- Cooling System Integration: This model utilizes a dual-circulation sea and fresh water heat exchanger. The external raw-water inlet plumbing requires a reliable 120mm pipe to maintain adequate fluid velocity through the cooling core during continuous operation.
Preventative Maintenance and Parts Procurement
Securing original equipment manufacturer components is critical for avoiding catastrophic mechanical failure at sea. HekoPower operates as an integrated Weichai engine spare parts supplier, ensuring your vessel has access to a consistent components supply chain.
In-Line Filtration Service Protocols
The Weichai 8170 series engine features an integrated non-stop duplex oil and fuel filtration manifold. This design allows engineers to isolate and replace clogged filter elements during active voyages without shutting down the engine.
Flushing out fuel water separators every 250 operating hours protects the precise fuel injection nozzles from water corrosion and fuel contamination.
Component Wear Thresholds and Overhaul Scheduling
This heavy-duty design delivers a reliable 12,000 to 20,000-hour operational lifespan before requiring a major overhaul. Engineers should closely monitor crankcase blow-by pressure values and engine oil consumption trends to evaluate the sealing condition of the internal pistons and three-ring assemblies.
When replacing worn parts, always source genuine Weichai marine engine components—including specialized oblique-incision connecting rods and gallery-cooled aluminum pistons—to maintain original balance and safety thresholds.
Weichai 170 series marine diesel engine, original products from Weichai. This series mainly includes X6170ZC350-1, X6170ZC408-1, X6170ZC450-1, X6170ZC540-1, X6170ZC450-2, X6170ZC480-2, X6170ZC540-2, X6170ZC620-2, X6170ZC650-2, X6170ZC580-3, X6170ZC608-3, X6170ZC680-3, X6170ZC735-3, X6170ZC620-4, X6170ZC620-5, X6170ZC550-5, X6170ZC756-5, X6170ZC818-5, 8170ZC600-1, 8170ZC720-2, 8170ZC818-3, 8170ZC900-3, 8170ZC900-5, 8170ZC1000-5.
Frequently Asked Questions
What is the exact price and typical manufacturing lead time for the Weichai 8170ZC720-2?
As a global Weichai marine engine distributor, HekoPower provides tailored pricing estimates based on specific project requirements, classification society mandates (such as CCS or BV), and selected gearbox pairings. The baseline price typically starts around USD $36,000 to $38,000 for standard configurations. Delivery lead times range from 30 to 45 days depending on current factory production schedules and your specific component options.
Does this propulsion engine comply with international maritime emission standards?
Yes, this Weichai diesel marine motor fully complies with IMO Tier II emissions standards. It features an optimized combustion bowl profile paired with a mechanical fuel system designed to reduce exhaust smoke opacity and lower total NOx emissions without requiring expensive exhaust aftertreatment systems.
Can HekoPower supply compatible marine gearboxes with the engine?
Yes, HekoPower offers complete, ready-to-install marine propulsion packages. We pair the Weichai 8170ZC720-2 with trusted heavy-duty gearboxes from brands like Advance or Fada (such as the D300A series), configuring specific reduction ratios between 3:1 and 6:1 to match your propeller pitch.
How does the fuel consumption change across various throttle positions?
The 529kW marine diesel engine is highly fuel efficient, with a baseline minimum fuel use of 197 g/kW·h. Under full-load operation at the rated 1200 RPM, total consumption remains at or below 208 g/kW·h, providing highly predictable fuel planning for long-distance transport.
What structural features help this model handle high mechanical loads?
The engine utilizes a high-rigidity gantry-style engine block design and individual, modular cylinder heads. This structural layout evenly distributes internal combustion pressures while preventing thermal deformation across the engine block during long continuous voyages.
