G80ME-C
The MAN G80ME-C is a large‑bore low‑speed two‑stroke diesel main engine (800 mm bore) built for high‑power propulsion on very large tankers and bulk carriers, offering broad fuel flexibility and IMO Tier II/III emissions compliance.
Engine Specifications
Inspector Detail
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Designation decoded
G for green/ultra-long-stroke, 80 for bore 800 mm, ME-C for fully electronic control. Ultra-long-stroke variant of the 800 mm series for maximum efficiency at lowest speed.
Background
The G80ME-C is the ultra-long-stroke version of the 800 mm series for large container ships (15,000–20,000 TEU) and VLCCs. Compared to the S80ME-C the G variant offers better propeller efficiency through lower speed. Positioned between G70 and G95 for applications that do not require the extreme power of the G95.
Calculated metrics
Inspector checklist
- Cylinder liner: 800 mm bore, ultra-long-stroke — extreme dimensions and transverse forces, wear measurement at 12 points
- Kolbenringe: Großer Ringumfang (>2.5 m) + Ultra-Long-Stroke = maximale Ringbelastung
- Crosshead bearing: Massive piston + ultra-long-stroke = highest transverse forces — bearing clearance and oil film formation absolutely critical
- Piston rod: Ovality and surface finish at extreme stroke length
- FIVA-Ventile: Große Hydraulikvolumina — Ansprechzeiten genau dokumentieren
- HPS: High capacity for large cylinders at lower speed
- PMI-Online: Zylinderdrucküberwachung kontinuierlich
- ECS: G-spezifische Ultra-Low-RPM Software
- Fuel injectors: large flow rates, longer injection duration at lower engine speed
- Fuel separators: Cat-Fine removal critical for large engines
- Brennstoff-Qualitätsmanagement
- Gland: Ultra-Long-Stroke at 800 mm bore = most extreme piston rod movement — drainage as main indicator
- Auslassventil: Große Ventildurchmesser, ME-C elektronisch
- Zylinderkopf: Blow-by an großen Dichtflächen
- Turbocharger: 2-3× TCA — efficiency and TC cut-out at ultra-low RPM
- Scavenge air cooler: large air mass flows, cleaning and pressure differential
- Auxiliary Blower: wider operating range in G series
Logbook reference values
| Parameter | Expected | Deviation means |
|---|---|---|
| Exhaust gas temperature per cylinder | 340–415 °C at 85% MCR | Spread >25 °C → Verbrennungs-Asymmetrie |
| Scavenge Air Pressure | 2.8-4.0 bar abs at MCR | Zu niedrig → Turbolader |
| Zylinderöl-Feed-Rate | 0.6-0.9 g/kWh | BN-Matching |
| ME Hydraulikdruck | 200-300 bar | Druckabfall → HPS/FIVA |
| Kühlwasser-Temperatur | 80-90 °C | Einzelzylinder-Abweichung → Dichtung/Laufbuchse |
Common Failure Modes
Expert tips
- 💡 G80 between G70 and G95: For ship-owners who do not require the extreme output of the G95, the G80 offers a more cost-effective alternative with the same efficiency philosophy
- 💡 Crosshead load at G80: The combination of 800 mm bore and ultra-long stroke produces the highest lateral forces in the MAN portfolio — crosshead maintenance has priority 1
- 💡 Laufbuchsen-Bestellung: Bei 800 mm G-Baureihe 9-12 Monate Vorlaufzeit — Verschleißtrend proaktiv auswerten
Related components
Classification & regulatory
IMO Tier II. EEDI Phase 3 konform. G-Baureihe für maximale EEDI/CII-Performance. SCR/EGR für Tier III.
Reference content for inspector orientation. Always verify against manufacturer's manual, latest service letters and class society requirements.
Components & Design
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Technical Data
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Common failures & inspection points
Service & Maintenance
Large-bore condition monitoring required: drain oil analysis, bearing temperature trend, scavenge inspections and performance deviation monitoring.
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