▼ Four stroke marine diesel engines are internal combustion engines designed specifically for ships.They are specially designed to handle special working conditions at sea, such as salt spray, ship swaying and continuous high load.These diesel engines are the core power source for small and medium-sized ships, like fishing boats, coastal transport ships and work ships.They can also be used as auxiliary power for large ships.They have good fuel efficiency and relatively low emissions.So marine diesel engines are not only suitable for coastal operations, but also can meet the needs of ocean-going tasks.These tasks must follow maritime environmental protection regulations.
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Model |
495C |
4100C |
4100ZC |
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Type |
Water - cooled,In - line,Four - stroke |
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Rated Power/Speed (kw/r/min) |
26.5/1500 30/1800 |
30.1/1500 33/1800 |
41.2/1500 48/1800 |
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Air Intake Method |
Natural Aspiration |
Supercharging |
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Number of Cylinders |
4 |
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Bore*Stroke (mm) |
95*115 |
100*115 |
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Compression Ratio |
19：:01 |
17:01 |
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Exhaust Temperature (°C) |
≤470 |
≤540 |
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Firing Order |
1-3-4-2 |
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Fuel Consumption Rate (g/kw.h) |
≤258.4 |
≤251.6 |
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Displacement (L) |
3.26 |
3.61 |
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Cooling Method |
Forced Water Cooling |
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Crankshaft Rotation Direction |
Counterclockwise (Viewed from the Power Output End) |
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Lubrication Method |
Pressure and Splash Combined Type |
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Starting Method |
Electric Start |
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Net Mass (kg) |
380 |
390 |
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Core Features of Four stroke marine diesel engines
1.Stable operation, suitable for long-term endurance
The four-stroke structure has a smoother combustion rhythm.Compared with two-stroke marine engines, parts like pistons and crankshafts wear more slowly.This allows the ship to sail continuously for days or even weeks.Four-stroke marine engines can run stably throughout the whole process.They don't need to stop frequently for maintenance, which reduces the risk of sailing interruptions.
2.Good fuel economy, reducing long-distance navigation costs
In low-load or medium-load working conditions (such as when the ship sails at a constant speed), four-stroke marine engines can control the fuel injection amount accurately.Some models are equipped with a 2000bar high-pressure fuel system.Their fuel consumption is 8%-15% lower than that of two-stroke marine engines with the same power.
3.Easier to meet emission standards, complying with environmental requirements
Most four stroke marine diesel engines have upgraded technologies like EGR (Exhaust Gas Recirculation) and DPF (Diesel Particulate Filter).With these upgrades, they can meet the Tier II/Tier III emission standards of the International Maritime Organization (IMO).This reduces the emission of nitrogen oxides and particulate matter.When sailing in areas with high environmental requirements, such as coastal areas and scenic sea areas, the ship won't be punished for "exceeding emission standards".It also avoids polluting the marine environment.
