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MAN Energy Solutions
11K90MC-C8
The MAN 11K90MC-C8 is a low‑speed, two‑stroke main propulsion engine delivering up to 103 950 kW at 76 rpm, distinguished by camshaft‑controlled fuel injection and constant‑pressure turbocharging.
103950.0 kW
Power
Engine Specifications
11
Cylinders
900 mm
Bore
2500 mm
Stroke
103,950 kW
MCR Power
76.0 rpm
MCR RPM
2-stroke
Stroke Type
Family: MAN B&W MC/MC-C
· Tier: Tier II
· Fuel: HFO, VLSFO, MDO
Inspector Detail
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Designation decoded
11 steht für 11 Zylinder, K für Short-Stroke (Kurzhub), 90 für 900 mm Bohrung, MC-C für MAN B&W MC-Compact-Baureihe, 8 für Mark 8.
Background
The K90MC-C8 with 11 cylinders is an extremely rare large engine. 11 cylinders at 900 mm bore generate enormous power for specialized large-ship applications. S/B 2.78 for higher speeds. The extreme engine length imposes the highest demands on ship structure, foundation and alignment.
Calculated metrics
Stroke To Bore Ratio
2.778
Inspector checklist
Laufzeug & Tribologie
- Cylinder liners: 900 mm bore — wear measurement at 12+ positions, systematic differences between forward and aft cylinders to be observed
- Piston rings: K-type with higher speed — ring wear to be compared across all 11 cylinders
- Zylinderschmierung: Bei 11 Zylindern Druckabfall in der Verteilerleitung zum letzten Zylinder prüfen
Kreuzkopf & Stopfbuchse
- Kreuzkopflager: 11 Lager — systematischer Temperatur-Trend-Vergleich
- Stopfbuchse: Drainage an 11 Zylindern dokumentieren
- Kolbenstange: Deflection an allen 11 Kröpfungen
Steuerung & Hydraulik
- Camshaft drive: 11 cylinders at K-type = most extreme chain length and dynamic loading
- Exhaust valves and fuel injection pumps on all 11 cylinders
- Timing-Gleichmäßigkeit über 11 Zylinder
Spülluft & Abgassystem
- Scavenge air box: Accessible — inspect all 11 ports
- Turbocharger: 3 TC — inspect and compare all
- Abgas-Economiser: Rußbrand-Prävention
Strukturelle Integrität
- Foundation: Most extreme engine length — all foundation bolts and chocking
- Alignment: 11 Kröpfungen + 12 Hauptlager — vollständige Deflection unter verschiedenen Beladungszuständen
- Double bottom inspect for cracks and distortion
Logbook reference values
| Parameter | Expected | Deviation means |
|---|---|---|
| Exhaust gas temperature per cylinder | 330–400 °C at MCR | Spread >15 °C → investigate, pay attention to end effects on cylinders 1 and 11 |
| Spülluftdruck | 2.8–3.5 bar | Abfall → TC prüfen |
| Pmax | ±3 bar Zylindergleichgewicht | Abweichung → Timing |
| Kreuzkopflager-Temperatur | 55–65 °C | Anstieg → sofort untersuchen |
| Kühlwasser-Temperatur | 80–85 °C | Einzelzylinder-Abweichung prüfen |
Common Failure Modes
Foundation distortion at 11×900 mm
Symptoms: Deflection outside tolerance, uneven main bearing wear, chocking separation
Causes: Extremely long and heavy engine, Ship hull bending in seaway and load exchange, Thermische Verformung
Preventive: Deflection at each docking under defined loading conditions, foundation inspect for cracks
Nockenwellen-Antrieb Überlastung
Symptoms: Timing-Drift, Kettenlängung, Geräusche
Causes: Extremste Kettenlänge der Baureihe, Dynamic load at K-type
Preventive: Chain case inspect every 8,000–10,000 operating hours
Ungleichmäßige Zylinderöl-Versorgung
Symptoms: Unterschiedliche Wear-Rates vorne/hinten
Causes: Druckabfall in Verteilerleitung über 11 Zylinder, Verstopfte Quills
Preventive: Compare oil pressure at first and last cylinder, test every quill
Expert tips
- 💡 11×K90MC-C8 belongs to the rarest and largest conventional ship engines — spare parts logistics (especially camshaft, chain drive) requires long-term advance planning
- 💡 Cylinder cover at 900 mm weighs >20 t — with 11 cylinders a major overhaul requires substantial crane and workshop capacity, minimum 5–6 weeks shipyard time
- 💡 Deflection under various loading conditions measure and compare — the extreme engine length makes alignment sensitive to ship hull bending
Related components
Turbolader (3 TC)
Foundation bolts and double bottom
Kurbelwellen-Hauptlager (12 Lager)
Chocking
Crankshaft and main bearing
Schwingungsdämpfer
Hilfsbläser
Classification & regulatory
IMO Tier I compliant. For Tier II combustion optimization or EGR/SCR. EEDI for large ships. MARPOL Annex VI — Scrubber or VLSFO.
Reference content for inspector orientation. Always verify against manufacturer's manual, latest service letters and class society requirements.
Other Cylinder Configurations 50
5L35MC-C8
5 cyl
· 6,450 kW
5L42MC-C8
5 cyl
· 10,100 kW
5L60MC-C8
5 cyl
· 21,000 kW
5L70MC-C8
5 cyl
· 31,150 kW
5L80MC-C8
5 cyl
· 42,000 kW
5S26MC-C8
5 cyl
· 3,700 kW
5S35MC-C8
5 cyl
· 7,650 kW
5S42MC-C8
5 cyl
· 12,950 kW
5S46MC-C8
5 cyl
· 15,500 kW
5S50MC-C8
5 cyl
· 18,650 kW
5S60MC-C8
5 cyl
· 28,250 kW
5S65MC-C8
5 cyl
· 35,000 kW
5S70MC-C8
5 cyl
· 40,400 kW
5S80MC-C8
5 cyl
· 51,000 kW
5S90MC-C8
5 cyl
· 64,350 kW
6K80MC-C8
6 cyl
· 43,500 kW
6K90MC-C6
6 cyl
· 30,780 kW
6K90MC-C8
6 cyl
· 56,700 kW
6K98MC-C8
6 cyl
· 85,020 kW
6L35MC-C8
6 cyl
· 7,740 kW
6L42MC-C8
6 cyl
· 12,120 kW
6L60MC-C8
6 cyl
· 25,200 kW
6L70MC-C8
6 cyl
· 37,380 kW
6L80MC-C8
6 cyl
· 50,400 kW
6S26MC-C8
6 cyl
· 4,440 kW
6S35MC-C8
6 cyl
· 9,180 kW
6S42MC-C8
6 cyl
· 15,540 kW
6S46MC-C8
6 cyl
· 18,600 kW
6S50MC-C8
6 cyl
· 22,380 kW
6S50MC-C8.2
6 cyl
· 9,960 kW
6S60MC-C8
6 cyl
· 33,900 kW
6S65MC-C8
6 cyl
· 42,000 kW
6S65MC-C8.2
6 cyl
· 16,440 kW
6S70MC-C8
6 cyl
· 48,480 kW
6S80MC-C8
6 cyl
· 61,200 kW
6S90MC-C8
6 cyl
· 77,220 kW
7K80MC-C6
7 cyl
· 28,980 kW
7K80MC-C8
7 cyl
· 50,750 kW
7K90MC-C8
7 cyl
· 66,150 kW
7K98MC-C7.1
7 cyl
· 40,040 kW
7K98MC-C8
7 cyl
· 99,190 kW
7L35MC-C8
7 cyl
· 9,030 kW
7L42MC-C8
7 cyl
· 14,140 kW
7L60MC-C8
7 cyl
· 29,400 kW
7L70MC-C8
7 cyl
· 43,610 kW
7L80MC-C8
7 cyl
· 58,800 kW
7S35MC-C8
7 cyl
· 10,710 kW
7S42MC-C8
7 cyl
· 18,130 kW
7S46MC-C8
7 cyl
· 21,700 kW
7S50MC-C8
7 cyl
· 26,110 kW
Components & Design
Component data being added…
Technical Data
unified from engine model
True
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Suppliers & Spare Parts
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Maritime Network →Manuals
-
operating
MAN B&W MC/MC-C Engine Operating Manual (OM-MC-C)MAN Energy Solutions
-
maintenance
MAN B&W MC/MC-C Maintenance Manual (MM-MC-C)MAN Energy Solutions
-
spare_parts
MAN B&W MC/MC-C Illustrated Parts Catalogue (IPC-MC-C)MAN Energy Solutions
-
project_guide
MAN B&W Project Guide MC/MC-C (PG-MC-C)MAN Energy Solutions
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Equipment Model #38273
· ✓ still in production