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MAN Energy Solutions

8G80ME-GI10

Name: MAN Energy Solutions 8G80ME-GI10
Brand: MAN Energy Solutions
SKU: OSE-38363

The MAN 8G80ME‑GI10 is a high‑power, low‑speed 2‑stroke diesel engine with high‑pressure gas injection, delivering up to 71 200 kW at 78 rpm and capable of running on HFO, VLSFO, MDO or LNG.

71200.0 kW

Power

Engine Specifications

Cylinders

800 mm

Bore

3450 mm

Stroke

71,200 kW

MCR Power

78.0 rpm

MCR RPM

2-stroke

Stroke Type

Family: MAN Energy Solutions ME-GI · Tier: Tier III · Fuel: HFO, VLSFO, MDO, LNG

Inspector Detail ✓ verified

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Designation decoded

8-cylinder, G-type (Green Ultra-Long-Stroke), 80 cm bore, ME-GI Mark 10 — electronically controlled two-stroke crosshead engine with high-pressure LNG gas injection (300 bar, diesel cycle)

Background

The 8G80ME-GI10 is a powerful ultra-long-stroke engine with an 800 mm bore and a stroke-to-bore ratio of 4.31, designed for large container ships and VLCCs with LNG dual-fuel propulsion. The larger bore enables higher per-cylinder output while optimising fuel efficiency. As an 8-cylinder variant, it offers excellent mass balancing and even torque delivery.

Calculated metrics

Stroke To Bore Ratio

4.31

Mean Effective Pressure Bar

21.5

Inspector checklist

HP Gas Compressor System

HP compressor stages — condition critical for overall GI function
300 bar output pressure — check all high-pressure connections for leaks
Check oil separator efficiency
Vibration analysis and bearing temperature trend
Test safety valves and emergency stop

Gas Injection Valves and Gas Supply

Check gas injection valves for tightness at 300 bar
Coking and erosion at valve seats and nozzles
Double-wall piping system — annular space monitoring
Gas pressure control and measurement sensors calibrated

Gas Detection System

Methane detectors in all upper space areas (methane rises)
Document calibration status and function test
Verify 20%/40% LEL alarm thresholds
Check detection redundancy concept

FIVA / HPS / HCU / EICU

FIVA valves for stroke, tightness and response behaviour
HPS pressure and hydraulic oil cleanliness
HCU leakage and wear
EICU parameter settings against current service letters

Cylinder and Tribology

BN25 cylinder oil for gas operation — verify grade and feed rate
Liner wear measurement on all 8 cylinders
Piston ring profile and clearances
Exhaust gas temperature spread: gas 310–370 °C, diesel 350–420 °C

Safety Systems

Test gas shut-off valves (master valve, block valves) for closing time
Check engine room ventilation system capacity
Test emergency changeover to pure diesel operation

Logbook reference values

Parameter	Expected	Deviation means
Exhaust gas temperature per cylinder (gas operation)	310–370 °C	Elevated values indicate combustion problems or nozzle wear; reduced values indicate injection valve defects.
Exhaust gas temperature per cylinder (diesel operation)	350–420 °C	Cylinder spread >30 °C indicates injection or valve problems.
HP compressor output pressure	280–310 bar	Pressure drop = compressor wear; pressure rise = control fault.
Scavenge pressure	2.8–4.0 bar	Low scavenge pressure reduces gas exchange efficiency and increases thermal load.
Compression pressures	135–160 bar	A drop indicates piston ring or valve wear.
Max. firing pressure (Pmax)	175–210 bar	Unevenness between cylinders requires injection timing correction.
Cylinder oil feed rate (BN25)	0.6–0.8 g/kWh	Too high = increased wear; too low = risk of corrosion.

Common Failure Modes

HP compressor valve damage

Symptoms: ['Pressure drop at the compressor outlet', 'Elevated stage temperatures', 'Abnormal vibrations']

Causes: Valve plate fatigue, Oil carry-over in the pressure stages, Maintenance interval exceeded

Preventive: Endoscopy and vibration monitoring per MAN specifications, keep spare valve plates on board.

Gas injection valve failure

Symptoms: ['Gas alarm', 'Exhaust gas temperature deviation', 'Loss of power at the cylinder']

Causes: Valve seat erosion at 300 bar, Thermal fatigue, Coking from pilot fuel

Preventive: Scheduled valve replacement, leak rate test at every cylinder inspection.

Double-wall pipe leakage

Symptoms: ['Pressure change in the annular space', 'Gas alarm in the pipe shaft', 'Automatic gas shutdown']

Causes: Vibration cracks, Corrosion, Thermal expansion issues

Preventive: Check brackets and compensators, annular space pressure test at class survey.

Turbocharger surging in gas operation

Symptoms: ['Pulsating charge air pressure signal', 'Unusual turbocharger noises', 'Power fluctuations']

Causes: Compressor wheel fouling, Operating point outside the map during load changes, Charge air cooler fouling

Preventive: Turbocharger washing per interval, map monitoring during gas/diesel changeover.

Expert tips

💡 Due to the large bore, the G80 has particularly high thermal loading on the cylinder liner — closely monitor cooling water temperature and flow on all cylinders.
💡 For large bores >700 mm, monitoring piston crown temperature via telemetry is especially important for early detection of overheating.
💡 HP compressor redundancy is especially critical for the 80 cm class due to the high gas volumes — regularly test changeover to the standby compressor.

Related components

Turbocharger and charge air cooler Exhaust valve and spindle seal Piston rings and liners Crosshead and connecting rod bearings Main bearing Fuel booster module LNG tank system and vaporiser Engine room ventilation system Cooling water system

Classification & regulatory

Extended class requirements apply to the 8G80ME-GI10 in accordance with the IGF Code. Installation on VLCCs requires additional risk analyses (HAZID/HAZOP). All gas components are subject to annual function testing and a 5-year main survey by the classification society.

Reference content for inspector orientation. Always verify against manufacturer's manual, latest service letters and class society requirements.