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Wartsila W-X40 low-speed marine diesel engine is designed to provide economic and reliable propulsion for various medium and small commercial ship, such as handysize bulk carrier, oil tanker, break-bulk carrier, refrigerated ship, container feeder ship and handysize LPG ship. Equipped 5-8 cylinders, with rated power of 4550-9080kw, speed of 124-146rpm.
| Cylinder Bore | Stroke | Rotating Speed | R1 Mean Effective Pressure | Piston Speed | Fuel Oil |
| 480mm | 2000rmm | 102-127rpm | 19.0bar | 8.5m/s | 700cSt/50° |
| Rated Power, Dimensions and Weights | ||||||
| Number of Cylinders | Output in kW at | Length | Weight | |||
| 146rpm | 124rpm | |||||
| R1 | R2 | R3 | R4 | |||
| 5 | 5676 | 4550 | 4825 | 4550 | 5050 | 109 |
| 6 | 6810 | 5460 | 5790 | 5460 | 5750 | 125 |
| 7 | 7945 | 6370 | 6755 | 6370 | 6450 | 140 |
| 8 | 9080 | 7280 | 7720 | 7280 | 7150 | 153 |
| Dimension | B | C | D | E | F | G |
| 2590 | 950 | 6335 | 1660 | 7700 | 1425 | |
| Automatic Fuel Consumption | ||||||
| Full Load | ||||||
| Stage Point | R1 | R2 | R3 | R4 | ||
| Brake mean effective pressure | 21 | 16.8 | 21 | 19.8 | ||
| IMO Tier II | RT-flex | Standard Adjustment | 175 | 169 | 175 | 173 |
| Part Load，% of R1 | 85 | 70 | 85 | 70 | 60 | |
| Variable Standard | Standard | Standard | Delat | Delat | Low-Load | |
| IMO Tier II | 171.8 | 171 | 171.1 | 169.5 | 169.5 | |
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