Wednesday, March 11, 2009

Worlds Biggest Engine






> >>

> >>

> >> The world's biggest engine is the Wartsila-Sulzer RTA96-C. It is a

> >> turbocharged two stroke diesel engine and it is the most powerful and

> >> efficient low revolution engine in the world today. The Wartsila-Sulser

> >> is

> >> manufactured by the Aioi Works in Japan and is part of Japans Diesel

> >> United

> >> Ltd engine manufacturers. Below is an 89 foot long 44 foot wide

> >> 12-cylinder

> >> DIESEL engine, literally as big as a house!

> >>

> >> These large engines are designed to power the world's super oil

> >> tankers and large container ships. They are built to the ship owners'

> >> preferences. They usually request an engine construction of a single unit

> >> and single propeller design for ease of maintenance, and not surprisingly

> >> any later troubleshooting. A single unit and single screw design has

> >> also

> >> proved over time to have a longer life span than double or even quad

> >> screws.

> >>

> >>

> >> These engines are built in 6, 8, 10, 12 and 14 cylinder

> >> configurations. All the engines are straight or 'inline'. The diameter

> >> of

> >> each cylinder is 3 foot 2 inches with a stroke of 8 foot 2 inches. The

> >> 12

> >> cylinder version weighs in at 2000 metric tons and delivers 90,000

> >> Horsepower at 100 Revolutions per minute (rpm's), with best fuel economy

> >> at

> >> 53,244 HP at 90rpm. When I mention economy, the 14 cylinder engine for

> >> example with a displacement of 25,480 Liters (1.56 million cubic inches)

> >> burns up 1,660 gallons of crude ("bunker") oil every hour.

> >>

> >> -------------------------

> >>

> >> The mathematical calculation: 1,660 gallons/per hour = 39.5 barrels

> >> of

> >> crude oil/used per hour = $2,844. These figures are worked out from the

> >> basis of crude oil @ $72 a barrel*. $2,844 every hour the engine runs

> >> or

> >> 27.6 gallons, which is $46.00 every minute or 76 cents a second! That

> >> is,

> >> of course, if the ships buy oil at trade price...if not, then these

> >> figures

> >> are the absolute minimum. ( * at time of publishing )

> >>

> >> -------------------------

> >>

> >> In the image below, a worker at the plant is finalizing work on t he

> >> cylinder block. This image shows the piston sleeves. The worker could

> >> quite easily have a nap inside one of the bores and no one would notice!

> >>

> >>

> >>

> >> Below are the pistons that will soon be fitted into the engine.

> >> Unlike normal car-sized pistons, these 3 foot diameter pistons

> >> incorporate

> >> lots of holes and it is through these holes that oil is inj ected through

> >> valves to keep all the working parts at a maximum low wear tolerance.

> >> Despite the colossal amounts of power output produced by these engines,

> >> surprisingly low wear rates have actually been recorded. Cylinder liner

> >> wear, for example, is only about 0.03 mm down for every 1000 hours of

> >> engine

> >> use. It must be remembered here that these engines work at about 20

> >> times

> >> slower than a normal 2.0-liter (122-ci) car engine and this is a major

> >> contributor to the life of the diesel engine.

> >>

> >>

> >>

> >>

> >> The image below depicts the 300 ton crankshaft of the 10 cylinder

> >> engine. You may notice here that there are steps on the wall of the

> >> casing

> >> to climb down into the engine's sump!

> >>

> >>

> >>

> >> In the image below, the pistons shell bearings are being fitted into

> >> the engine block. They are lowered into place by a crane and guided in b

> >> y

> >> two workers and a supervisor. They keep all surfaces of the engine clean

> >> at

> >> this stage, as any grit or dirt could later add wear to the engine, or

> >> worse

> >> destroy it, so the workers are wearing special cloth overshoes so as not

> >> to

> >> leave any abrasions on the fine working surfaces. Also you may notice

> >> that

> >> sheeting is covering the rest of the engine's crankcase bearing housing

> >> to

> >> keep the dust off. These engines cost many millions upon millions of

> >> dollars; in fact, more than the ship itself that they are installed into.

> >>

> >>

> >>

> >> 100,000 HP was actually achieved on a test bed in the workshop with

> >> the 14 cylinder model,

> >> running the engine flat out at just under 102 RPM.

> >>Thanks Richard W.

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