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Sulzer
8RTA96C
The Sulzer 8RTA96C is a low‑speed, two‑stroke diesel main engine delivering up to 43 920 kW at 102 rpm, renowned for its high power density and proven reliability on very large vessels.
43920.0 kW
Power
Engine Specifications
8
Cylinders
960 mm
Bore
2500 mm
Stroke
43,920 kW
MCR Power
102.0 rpm
MCR RPM
2-stroke
Stroke Type
Family: Sulzer RTA
· Tier: IMO Tier I
· Fuel: HFO, MDO
Inspector Detail
▸
Designation decoded
8RTA96C – Sulzer (Wärtsilä) RTA-Baureihe, 8 Zylinder in Reihe, 960 mm Bohrung, 2500 mm Hub, Zweitakt-Kreuzkopfmotor mit zahnradgetriebenem Nockenwellenantrieb. C-Suffix für Container-Ausführung. WELTREKORD-MOTOR: Der RTA96C mit 960 mm Bohrung ist der leistungsstärkste Dieselmotor der Welt. Bohrung 960 mm liegt am oberen Ende des Trockendock-pflichtigen Bereichs (820–960 mm).
Background
The 8RTA96C is an icon of marine engine technology – with 960 mm bore and the resulting enormous power output, this engine holds the world record as the most powerful diesel engine. Designed for the world's largest container ships, the RTA96C delivers the required propulsion power for Ultra Large Container Vessels (ULCV). The stroke ratio of 2.60:1 is designed for the required higher speeds in container operation. The gigantic dimensions place extreme demands on maintenance, dry-dock infrastructure and inspection planning. VIT, pulse lubrication and CLU are standard equipment. The 8-cylinder configuration offers optimal vibration characteristics, which are particularly important at this enormous power output.
Calculated metrics
Stroke To Bore Ratio
2.6
Inspector checklist
Weltrekord-Motor: Spezifische Großmotoren-Inspektion
- Account for dimension-related challenges at 960 mm bore – all tools and measuring instruments to be designed for large engine dimensions
- Thermal stresses at extremely large piston diameter to be evaluated with particular care
- Piston crown NDT inspection at 960 mm diameter requires systematic area coverage
- Consider exhaust valve diameter and weight during handling and inspection
Trockendock-Inspektion (960 mm – obere Grenze)
- Kolbenausbau erfordert Schwerlasten-Hebezeug – Trockendock-Krankapazität vorab bestätigen
- Liner measurement with large-bore gauge at minimum 6 planes and 2 axes
- Kolbenkrone auf Risse mittels PT/MT über gesamte Fläche (>7200 cm²) systematisch prüfen
- Consider liner weight (several tonnes) when planning replacement logistics
Container-Hochlastbetrieb
- Sustained load close to MCR with ULCV operation – assess thermal stress on all components
- Document turbocharger performance and condition at record-breaking power
- Monitor fuel injection system wear under high sustained load
- Abgastemperaturverteilung zwischen allen 8 Zylindern engmaschig überwachen
Nockenwellenantrieb
- Measure gear backlash – observe extreme forces at record-breaking power
- Document gear flank images carefully – pitting and fatigue marks
- Check camshaft bearings for increased load and temperature
- Inspect cam profile for wear and deformation
VIT and injection system
- Check VIT calibration at various load steps
- Check fuel injectors on 960 mm bore for complete combustion chamber coverage
- Monitor fuel pump pistons and valves for wear
- Inspect high-pressure lines for fatigue and vibration
Prime mover and crosshead
- Carefully inspect crosshead bearings at extreme bearing forces
- Kurbelwellendurchbiegung messen – Kurbelwellendimensionen beachten
- Document main bearing clearance and condition at record-breaking forces
- Pleuelschrauben-Vorspannung hydraulisch kontrollieren
Logbook reference values
| Parameter | Expected | Deviation means |
|---|---|---|
| Exhaust gas temperature per cylinder | 340–400 °C at 85 % MCR | At record-breaking power, uniform combustion across all 8 cylinders is critical – investigate deviation >25 °C immediately |
| Pmax (Zünddruck) | 145–165 bar at MCR | Uneven Pmax distribution at this power causes extreme mechanical stress on individual engines |
| Spülluftdruck | 3.2–4.0 bar abs. at MCR | Record-breaking engine requires high boost pressure – pressure drop indicates turbocharger problems that must be remedied immediately at this power class |
| Zylinderöl-Zuführrate | 0,8–1,2 g/kWh | Bei 960 mm Bohrung ist die absolute Ölmenge pro Zylinder enorm – gleichmäßige Verteilung auf der großen Lauffläche sicherstellen |
| Kolbenkühlöl-Austrittstemperatur | 55–70 °C | Bei der enormen Kolbenfläche ist gleichmäßige Kühlung essentiell – Temperaturanstieg sofort auf Kanalverstopfung untersuchen |
| Kurbelwellendurchbiegung | ±0,05 mm (warm) | Bei Weltrekord-Kurbelwellendimensionen sind Durchbiegungsänderungen besonders kritisch für Lagersicherheit |
| Turbolader-Drehzahl | Gemäß Herstellerkurve für aktuelle Last | Turbochargers operate near their performance limit at this engine power – monitor deviations closely |
| Hauptlager-Temperatur | <70 °C | At extreme bearing forces, temperature monitoring is critical – rise indicates impending bearing damage |
Common Failure Modes
Piston crown burnthrough under extreme thermal stress
Symptoms: ['Plötzlicher Abgastemperaturanstieg am betroffenen Zylinder', 'Ölnebeldetektor-Alarm', 'Pressure loss during cylinder pressure test', 'Leistungsabfall']
Causes: Clogged piston cooling oil passages with enormous piston area, Continuous operation at maximum load without adequate maintenance, Defekte Einspritzdüsen mit ungleichmäßiger Brennstoffverteilung auf 960 mm Brennraumdurchmesser, Cat-Fines-Schäden an Laufbuchse verursachen lokale Überhitzung
Preventive: Measure piston cooling oil flow at every inspection and compare with target value, overhaul fuel injection nozzles at shortened intervals, systematically inspect piston crown across entire area by NDT during dry-dock overhaul
Cylinder liner wear and ovality at 960 mm bore
Symptoms: ['Increased blow-by and lube oil consumption', 'Uneven wear profile during liner measurement', 'Drain-Oil-Analyse zeigt erhöhten Eisenabrieb']
Causes: Cat-Fines im Brennstoff (>15 ppm), Ungleichmäßige Puls-Schmierverteilung auf der riesigen Lauffläche, Thermal deformation of cylinder liner at high load, Unzureichende Zylinderöl-BN für aktuellen Schwefelgehalt
Preventive: Cat-Fines monitoring with limit <10 ppm downstream of separator, optimize pulse lubrication for 960 mm bore, take cylinder liner measurements at shortened intervals with large-bore measuring instrument
Turbocharger overload at world-record power
Symptoms: ['Turbocharger surging during load changes', 'Schwingungsanstieg am Turbolader', 'Charge pressure drop at same engine load', 'Erhöhte Turbolader-Lagertemperaturen']
Causes: Turbolader arbeiten nahe Leistungsgrenze, Contamination of turbine or compressor side reduces efficiency, Turbocharger bearing problems at high speed, Exhaust-side deposits from heavy fuel oils
Preventive: Strictly maintain turbocharger water-washing intervals, perform borescopy of turbine blades at regular intervals, install and evaluate turbocharger vibration monitoring
Main bearing overload from extreme crankshaft forces
Symptoms: ['Hauptlager-Temperaturanstieg', 'Weißmetallpartikel in Schmierölanalyse', 'Kurbelwellendurchbiegungs-Änderung', 'Ungewöhnliche Geräusche im Kurbelgehäuse']
Causes: Extreme gas and inertia forces at world-record power, Foundation deformation from hull stress, Lubricating oil contamination or shortage, Bearing material fatigue at high operating hours
Preventive: Continuously monitor main bearing temperature and track trend, perform bearing metal analysis at shortened intervals, measure crankshaft deflection at every class survey
Camshaft gear train wear at extreme power
Symptoms: ['Verändertes Einspritz-Timing', 'Geräuschentwicklung am Antrieb', 'Metallabrieb im Getriebeöl', 'Gear flank images show pitting and spalling']
Causes: Extreme forces at world-record power overload gear flanks, Thermal expansion during continuous operation near MCR, Schmierölqualität unzureichend, Resonanzschwingungen im Antriebsstrang
Preventive: Document gear flank play and images at every class survey, perform gear oil analysis for metal particles, perform vibration analysis on drive train at full load
Expert tips
- 💡 The 8RTA96C as the world's most powerful diesel engine requires special awareness at every inspection of the extreme dimensions and forces – standard tools and procedures for small engines are NOT sufficient.
- 💡 For dry-dock planning of the RTA96C, the shipyard must have heavy-lift cranes and adequate space for components weighing several tonnes.
- 💡 The 960 mm cylinder liner requires special attention to oil distribution over the entire running surface during pulse lubrication – lubricating quill positions and angles are critical for uniform wear.
Related components
Turbolader (mehrere, lastabhängig konfiguriert)
Ladeluftkühler (Großdimensionen)
Kraftstoff-Aufbereitungsanlage (hoher Durchsatz)
Exhaust gas boiler and economizer (large dimensions)
Kurbelwellen-Hauptlager (Weltrekord-Dimensionen)
Thrust bearing and propeller shaft
Stevenrohrlager
Torsional vibration damper (critical at this power level)
Foundation and double-bottom structure
Wellengenerator/PTO (falls vorhanden)
Schiffskörper-Verformungsüberwachung
Classification & regulatory
The RTA96C as the world's largest diesel engine is subject to special attention by classification societies. At 960 mm bore, dry-dock inspections are mandatory for all piston and cylinder liner work. EEDI/EEXI requirements may require power limitation (EPL) or efficiency measures in this power class. MARPOL Annex VI Reg. 13 NOx limit values and Reg. 14 sulphur limit values must be strictly observed. NOx Technical File and EIAPP certificate must reflect the current engine condition. CII rating of the ship is primarily determined by engine efficiency.
Reference content for inspector orientation. Always verify against manufacturer's manual, latest service letters and class society requirements.
Other Cylinder Configurations 50
5RTA48T
5 cyl
· 6,600 kW
5RTA48T-B
5 cyl
· 7,150 kW
5RTA52
5 cyl
· 7,350 kW
5RTA52U
5 cyl
· 7,850 kW
5RTA58T
5 cyl
· 10,150 kW
5RTA58T-B
5 cyl
· 10,800 kW
5RTA62
5 cyl
· 10,100 kW
5RTA62U
5 cyl
· 11,000 kW
5RTA62U-B
5 cyl
· 12,000 kW
5RTA72
5 cyl
· 16,000 kW
5RTA72U
5 cyl
· 17,000 kW
5RTA72U-B
5 cyl
· 18,000 kW
5RTA82T
5 cyl
· 16,600 kW
5RTA84T
5 cyl
· 19,100 kW
5RTA84T-D
5 cyl
· 22,600 kW
6RTA48T
6 cyl
· 7,920 kW
6RTA48T-B
6 cyl
· 7,920 kW
6RTA52
6 cyl
· 8,820 kW
6RTA52U
6 cyl
· 9,420 kW
6RTA58T
6 cyl
· 12,180 kW
6RTA58T-B
6 cyl
· 12,960 kW
6RTA62
6 cyl
· 12,120 kW
6RTA62U
6 cyl
· 13,200 kW
6RTA62U-B
6 cyl
· 14,400 kW
6RTA72
6 cyl
· 19,200 kW
6RTA72U
6 cyl
· 20,400 kW
6RTA72U-B
6 cyl
· 21,600 kW
6RTA82T
6 cyl
· 19,920 kW
6RTA84C
6 cyl
· 22,920 kW
6RTA84T
6 cyl
· 22,920 kW
6RTA84T-D
6 cyl
· 27,120 kW
6RTA96C
6 cyl
· 32,940 kW
6RTA96C-B
6 cyl
· 34,320 kW
7RTA48T
7 cyl
· 9,240 kW
7RTA48T-B
7 cyl
· 10,010 kW
7RTA52
7 cyl
· 10,290 kW
7RTA52U
7 cyl
· 10,990 kW
7RTA58T
7 cyl
· 14,210 kW
7RTA58T-B
7 cyl
· 15,120 kW
7RTA62
7 cyl
· 14,140 kW
7RTA62U
7 cyl
· 15,400 kW
7RTA62U-B
7 cyl
· 16,800 kW
7RTA72
7 cyl
· 22,890 kW
7RTA72U
7 cyl
· 23,800 kW
7RTA72U-B
7 cyl
· 25,200 kW
7RTA82T
7 cyl
· 23,240 kW
7RTA84C
7 cyl
· 26,740 kW
7RTA84T
7 cyl
· 26,740 kW
7RTA84T-D
7 cyl
· 31,640 kW
7RTA96C
7 cyl
· 38,430 kW
Components & Design
Component data being added…
Technical Data
unified from engine model
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Maritime Network →Manuals
-
operating
Sulzer RTA Operating ManualWärtsilä Switzerland (historical Sulzer)
-
maintenance
Sulzer RTA Maintenance ManualWärtsilä Switzerland (historical Sulzer)
-
spare_parts
Sulzer RTA Spare Parts CatalogueWärtsilä Switzerland (historical Sulzer)
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Equipment Model #38689
· ✓ still in production