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Sulzer

10RTA96C-B

Name: Sulzer 10RTA96C-B
Brand: Sulzer
SKU: OSE-38704

The Sulzer 10RTA96C-B is a high‑power, low‑speed two‑stroke diesel main engine delivering up to 57 MW at 102 rpm, designed for very large merchant vessels.

57200.0 kW

Power

Engine Specifications

Cylinders

960 mm

Bore

2500 mm

Stroke

57,200 kW

MCR Power

102.0 rpm

MCR RPM

2-stroke

Stroke Type

Family: Sulzer RTA · Tier: IMO Tier I · Fuel: HFO, MDO

Inspector Detail ✓ verified

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Designation decoded

Sulzer 10RTA96C-B – 10-cylinder two-stroke crosshead engine, bore 960mm, stroke 2,500mm, series C-B (improved container variant). Suffix -B designates optimized design with improved combustion process, adjusted piston geometry and optimized cylinder oil dosing compared to base version RTA96C.

Background

The 10RTA96C-B is the further developed version of the world's most powerful marine diesel engine. The B variant (improved) offers optimized combustion with higher thermal efficiency compared to the base engine, improved piston rings and liner geometry for reduced wear, and optimized pulse lubrication with improved quantity control. The stroke-bore ratio remains identical at 2.604:1. VIT and CLU concept were retained, however with improved components. The gear-driven camshaft was optimized for reduced torsional vibration.

Calculated metrics

Stroke To Bore Ratio

2.604

Inspector checklist

Logbook reference values

Parameter	Expected	Deviation means
Zünddruck (Pmax)	145–160 bar (Volllast, VIT aktiv)	B version allows higher Pmax – deviation >5 bar between cylinders indicates fuel injection nozzle wear or VIT misadjustment
Verdichtungsdruck (Pcomp)	125–140 bar	Lower value = piston ring wear (B rings have different geometry) or exhaust valve leakage
Exhaust gas temperature per cylinder	340–410 °C	B-Version hat engere Toleranzen; Abweichung >25 °C vom Mittelwert erfordert Ursachenanalyse
Zylinderöl-Verbrauch	0,6–1,0 g/kWh (optimierter ACC-Modus)	B version has reduced target consumption – excess indicates wear of improved piston rings
Kühlwassertemperatur Laufbuchse	75–85 °C Eintritt	Identical to base engine – thermal anomalies become detectable faster due to improved cooling geometry
Spülluftdruck	2,8–3,5 bar (Volllast)	As base engine – deviations indicate turbocharger or charge air cooler problems
Kurbelwellen-Deflection	±0,05 mm	Excess = foundation deformation – particularly critical with 10 cylinders
SFOC (spezifischer Brennstoffverbrauch)	Gemäß Testbed-Protokoll (B-Version ca. 1–2% niedriger als Basis)	Increased SFOC = loss of B optimization, VIT check and combustion diagnostics required

Common Failure Modes

Premature wear of B piston rings

Symptoms: ['Blow-by am Spülluftkasten', 'Erhöhter Zylinderölverbrauch über B-Sollwert', 'Pressure loss during compression test']

Causes: Use of non-B spare parts during maintenance, Incorrect running-in procedure after piston ring replacement, Cylinder oil BN not adapted to fuel quality

Preventive: Use exclusively B-specific spare parts, strictly adhere to manufacturer's running-in program after piston ring replacement, adapt cylinder oil feed rate to sulfur content

VIT control deviation due to software/hardware incompatibility

Symptoms: ['Pmax values do not reach B specification', 'Ungleichmäßige Leistungsverteilung', 'Erhöhter SFOC']

Causes: VIT parameters not updated to B version, Control rod wear evaluated with old tolerances, Software update not installed

Preventive: When converting or servicing, always use B-specific parameters, follow Service Letters and Technical Bulletins for B version

Fundamentverformung (identisch mit Basismotor)

Symptoms: ['Deflection-Werte außerhalb Toleranz', 'Hauptlager-Temperaturerhöhung', 'Vibrationsanstieg']

Causes: Schiffskörperdeformation, Beladungsasymmetrie, Chock-Alterung

Preventive: Six-monthly deflection measurement, foundation bolt check, chock inspection at docking

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Related components

T u r b o c h a r g e r ( A B B T P L o r M H I M E T ) , c h a r g e a i r c o o l e r , e x h a u s t g a s b o i l e r , s h a f t l i n e b e a r i n g , s t e r n t u b e s e a l , t o r s i o n a l v i b r a t i o n d a m p e r , f u e l t r e a t m e n t , s c a v e n g e a i r n o n - r e t u r n v a l v e s , h y d r a u l i c p o w e r u n i t ( H C U ) , B - s p e c i f i c s p a r e p a r t s i n v e n t o r y c h e c k

Classification & regulatory

All regulatory requirements of the base RTA96C apply identically. Additionally: NOx Technical File must contain B-specific combustion parameters. With component mixing (base/B), NOx certification may be jeopardized. Check EIAPP certificate on B version.

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

Other Cylinder Configurations 50

Components & Design

Component data being added…

Technical Data

unified from engine model True

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Manuals

operating
Sulzer RTA Operating Manual
Wärtsilä Switzerland (historical Sulzer)
maintenance
Sulzer RTA Maintenance Manual
Wärtsilä Switzerland (historical Sulzer)
spare_parts
Sulzer RTA Spare Parts Catalogue
Wärtsilä Switzerland (historical Sulzer)

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Equipment Model #38704 · ✓ still in production