The Niigata HX Series represents a complete lineup of modern, medium-speed diesel engines designed for marine and industrial applications. These 4-stroke engines feature a best design with a highly rigid monoblock cylinder block, integrating lubrication and cooling passages for compactness and reliability. Known for their fuel efficiency, HX engines incorporate advanced technologies like non-cooled turbochargers and direct-mounted air coolers to optimize performance.
Their simplified maintenance design, including easily removable cylinder units, makes them a practical choice for vessel operators seeking durability and operational cost savings.| Parameter | HX Series | Remarks |
|---|---|---|
| Models | 6MG19HX, 6MG22HX, 6MG25HX, 6MG28HX, 8MG28HX, 6MG34HX, 8MG34HX, 6MG41HX | Configurations: Inline 6–16 cylinders |
| Bore × Stroke (mm) | 190×260 – 410×550 | Larger bore = higher power |
| Displacement (L/cyl) | 9.29L–11.63L | 6MG41HX: Largest displacement |
| Dry Weight (tons) | 7.0–64.0 | 6MG41HX: Heaviest (64 tons) |
| Compression Ratio | 16:1 | Optimized for Marine Diesel Oil (ISO 8217) |
| Aspiration | Turbocharged (ABB TPS) | High-efficiency turbocharger |
| Parameter | HX Series | Remarks |
|---|---|---|
| Max Power (kW/PS) | 761–5,890 kW / 1,035–8,810 PS | 6MG41HX: Highest power (5,890 kW) |
| RPM Range | 520–1,650 RPM | 6MG25HX/28HX: 750 RPM (high torque) |
| BMEP (Bar) | 10–12 | High BMEP = improved efficiency |
| Fuel Consumption (g/kWh) | 195–210 | Competitive for medium-speed engines |
| Emissions Compliance | Tier II (SCR-ready for Tier III) | Meets IMO NOx regulations |
| Parameter | HX Series | Remarks |
|---|---|---|
| Cylinder Block | Monoblock nodular cast iron | Integrated cooling pipes, high rigidity |
| Turbocharger | ABB TPS (non-cooled) | Corrosion-resistant, high-pressure ratio |
| Fuel Injection | Mechanical | Reliable, low maintenance |
| Cooling System | Jacket water + air | Air cooler directly mounted on block |
| Gauge Board | “Grafico” digital display | LED bar graphs for real-time monitoring |
| Parameter | HX Series | Remarks |
|---|---|---|
| Overhaul Interval (hrs) | 8,000–10,000 | Dependable for long-term use |
| Key Wear Parts | Liners, pistons, bearings | Replaceable cylinder liners |
| Lube Oil Interval | 700 hrs | Standard maintenance cycle |
| Parameter | HX Series | Remarks |
|---|---|---|
| Best Suited Vessels | Offshore supply vessels, Tugs, Ferries, General cargo ships | Versatile for medium power needs |
| Installation Flexibility | Compact V-design | Fits tight engine rooms |
| Noise/Vibration | Moderate (dampened) | Balanced for crew comfort |
As a trusted OEM-authorized partner and supplier of Niigata spare parts, Neptunus combines over 30 years of industry expertise with more than two decades of specialization in Niigata engine solutions. Our comprehensive service offering includes precise overhaul and repair services that aim to reduce vessel downtime while enhancing engine reliability and performance.
At Neptunus, we provide an extensive selection of genuine Niigata engine parts, ensuring that each component used aligns with the highest standards of durability, efficiency, and compliance. With an unwavering focus on service excellence and technical precision, Neptunus supports marine and industrial sectors in maintaining optimal engine performance, thereby ensuring long-term operational efficiency and sustainability.Fill in Details for a Quote
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