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Wärtsilä-Sulzer RTA96-C

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Title: Wärtsilä-Sulzer RTA96-C  
Author: World Heritage Encyclopedia
Language: English
Subject: Diesel engine, Straight-seven engine, Straight-14 engine, Engine power, Mean effective pressure
Collection: Marine Diesel Engines, Two-Stroke Diesel Engines, Wärtsilä
Publisher: World Heritage Encyclopedia

Wärtsilä-Sulzer RTA96-C

The Wärtsilä RT-flex96C is a two-stroke turbocharged low-speed diesel engine designed by the Finnish manufacturer Wärtsilä. It is designed for large container ships that run on heavy fuel oil. Its largest 14-cylinder version is 13.5 metres (44 ft) high, 26.59 m (87 ft) long, weighs over 2,300 tonnes, and produces 80,080 kilowatts (107,390 hp). The engine is the largest reciprocating engine in the world.

The 14-cylinder version was put into service in September 2006 aboard the Emma Mærsk. The design is like the older RTA96C engine, with common rail technology instead of traditional camshaft, chain gear, fuel pumps and hydraulic actuators. All this provides the maximum performance at low revolutions per minute (rpm), lower fuel consumption and lower harmful emissions.

The engine has crosshead bearings so that the always-vertical piston rod allows a tight seal under the piston. Consequently, the lubrication of the engine is split: the cylinders and the crankcase use different lubricants, each being specialised for and dedicated to its role. The cylinders are lubricated by continual, timed injection of consumable lubricant, formulated to protect the cylinders from wear and to neutralise the acids formed during combustion of the high-sulfur fuels commonly used. The crosshead design reduces sideways forces on the piston, keeping diametral cylinder liner wear in the order of only about 0.03 mm per 1000 hours.[1]

The descending piston is used to compress incoming combustion air for the adjacent cylinders which also serves to cushion the piston as it approaches bottom dead centre (BDC) to remove some load from the bearings. The engine is uniflow-scavenged by way of exhaust valves that are operated by electronically controlled, common-rail hydraulics, thus eliminating the camshaft.

As of 2006, more than 300 RT-flex96C engines and older RTA96C engines were in service or on order.[2]


  • Technical data (as of 2008) 1
  • See also 2
  • References 3
  • External links 4

Technical data (as of 2008)

Configuration Turbocharged two-stroke diesel straight engine, 6 to 14 cylinders
Bore 37.75 inch (960 mm)
Stroke 8.4 inch (2,500 mm)
Displacement 111,063 CI (1,820 litres) per cylinder
Engine speed 22–102 RPM
Mean effective pressure 1.96 MPa @ full load, 1.37 MPa @ maximum efficiency (85% load)
Mean piston speed 8.5 meters per second
Specific fuel consumption 171 g/(kW·h)
Power Up to 5,720 kW per cylinder, 34,320–80,080 kW (46,680–108,920 BHP) total
Torque Up to 7,603,850 newton metres (5,608,310 lbf·ft) @ 102 rpm
Power density 29.6 to 34.8 kW per tonne, 2300 tonnes for the 14 cylinder version
Mass of fuel injected per cylinder per cycle ~160 g (about 6.5 ounces) @ full load (Whole motor uses up to 250 tons of fuel per day.)
Crankshaft weight 300 tons[1]
Piston weight 5.5 tons
Piston Height 20 feet

See also


  1. ^ a b Hanlon, Mike. Most powerful diesel engine in the world GizMag. Accessed: 24 February 2011.
  2. ^ "The world's most powerful Engine enters service" (Press release). Wärtsilä Corporation. 2006-09-12. 

External links

  • Wärtsilä.com
  • Wärtsilä RT-flex96C / RTA96C
  • The Most Powerful Diesel Engine in the World, Todd Walke
  • Gallery of 8 images
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