The Wartsila-Sulzer RTA96-C turbocharged two-stroke diesel engine is the
most powerful and most efficient prime-mover in the world today. The
Aioi Works of Japan's Diesel United, Ltd built the first engines and is
where some of these pictures were taken.
It is available in 6 through 14 cylinder versions, all are inline engines. These engines were designed primarily for very large container ships. Ship owners like a single engine/single propeller design and the new generation of larger container ships needed a bigger engine to propel them.
The cylinder bore is just under 38" and the stroke is just over 98". Each cylinder displaces 111,143 cubic inches (1820 liters) and produces 7780 horsepower. Total displacement comes out to 1,556,002 cubic inches (25,480 liters) for the fourteen cylinder version.
Fuel consumption at maximum
power is 0.278 lbs per hp per hour (Brake Specific Fuel
Consumption). Fuel consumption at maximum economy is 0.260
lbs/hp/hour. At maximum economy the engine exceeds 50% thermal
efficiency. That is, more than 50% of the energy in the fuel in
converted to motion.
Even at it's most efficient power setting, the big 14 consumes 1,660 gallons of heavy fuel oil per hour.
section of the RTA96C:
The internals of this
engine are a bit different than most automotive
the "thin-shell" bearings. Crank & rod journals are 38" in
diameter and 16" wide:
sitting in the block (also known as a "gondola-style" bedplate).
This is a 10 cylinder version.|
Note the steps by each crank throw that lead down into the crankcase:
& piston rod assembly. The piston is at the top. The large
square plate at the bottom is where the whole assembly attaches to the
cylinder deck (10 cylinder version). Cylinder liners are die-cast
ductile cast iron. Look at the size of those head studs!:
completed 12 cylinder engine:
This is a copy of the page produced by Todd Walke