7S80ME-LGIM9.6
The MAN 7S80ME-LGIM9.6 is a 2‑stroke low‑speed main engine delivering up to 71 MW at 78 rpm, featuring diesel‑pilot ignition and high‑pressure methanol injection for dual‑fuel operation.
Engine Specifications
Inspector Detail
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Designation decoded
7 = number of cylinders, S = Super Long Stroke, 80 = bore 800 mm, ME = MAN Electronically controlled, LGIM = Liquid Gas Injection Methanol, 9.6 = Mark 9.6 control generation.
Background
The 7S80ME-LGIM is the Super-Long-Stroke version of the 80 platform with 7 cylinders. 3200 mm stroke, higher speed than the G80. For large tankers and bulkers at moderate speed. The S80 7-cylinder configuration offers high power in a more compact design than the G variant.
Calculated metrics
Inspector checklist
- High-pressure pumps: 7 x 800 mm delivery quantity
- Injection valves: 800 mm combustion chamber, spray pattern
- Double-wall piping: complete system
- Changeover: 7 injectors synchronously
- Liners 800 mm: BN 25-40, bore polishing
- Piston rings: thermal deformation at 800 mm
- Crosshead: S/B=4.0, moderate vs. the G80
- Stuffing box: 7 drainage lines
- HPS: 7 FIVA, hydraulic load
- Methanol maps Mark 9.6
- Timing 7 cylinders
- Detectors, ESD, UV/IR, OMD: 7 cylinders
Logbook reference values
| Parameter | Expected | Deviation means |
|---|---|---|
| Exhaust temperature | 290-375 °C | >25 °C spread |
| Methanol injection pressure | 600-700 bar | Pump/filter |
| Cylinder oil consumption | 0.5-0.8 g/kWh | Dosing |
| OMD | <2.5% LEL | Leakage |
Common Failure Modes
Expert tips
- 💡 7S80 vs. 7G80: 250 mm less stroke, more compact, easier crosshead access — methanol timing is more critical, however, because of the shorter injection window.
- 💡 With 7 x 800 mm methanol: check waste heat boiler steam production, it can become marginal.
Related components
Classification & regulatory
IGF Code, LFPF notation. IMO Tier II.
Reference content for inspector orientation. Always verify against manufacturer's manual, latest service letters and class society requirements.
Other Cylinder Configurations 47
Components & Design
Component data being added…
Technical Data
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