MAN 175D; Technology Driven Compact Marine Engine
A High-Tech, High-Speed, Highly Efficient Engine for the High Seas
In a never-ending quest to build the cleanest, most efficient, best-performing engines, development of modern diesels by all manufacturers is driven largely by technology. The days of simply constructing larger, more powerful oil-burners without much consideration for emissions or fuel economy are gone. Engine manufacturers now use different turbochargers, fuel delivery parts, and processes to ensure their powerplants meet customers’ needs while still meeting modern emissions standards.
Since there is no single correct formula, each company takes different routes to finding a solution. Many start with a clean slate to develop a powerplant that meets the established standards, while others apply new innovations to existing engines to keep them viable.
MAN Diesel & Turbo saw the need for an engine that meets current marine emissions standards while providing power and economy for a broad range of applications. So the company sent its research team around the world to visit and talk with operators and shipbuilders to gain a better understanding of what is needed in a modern engine. Using data gathered through talks with clients and users, the designers were able to incorporate the information into the development of a new V-12 engine, the MAN 175D.
The 175D is designed with versatility in mind, which allows it to be configured for a variety of vessels like yachts, tugboats, or naval ships as either a propulsion or genset unit. This is done by initially building it in a basic compact configuration, and then using modular components such as a bolt-on seawater cooler, centrifuge, and automatic filter (as needed) to make the engine more application specific. This also allows the 175D to be easily maintained and reconfigured as necessary.
The 175D uses a variety of modern advances to meet the end goal of being a compact, economical, easy-to-operate-and-maintain power source. A MAN-developed high-efficiency TCR12 turbocharger provides the boost needed to produce 2,977 hp and 8,229 lb-ft of torque. Fuel is delivered by the trusted technology of a common-rail fuel-injection system. Using this type of established technology promotes reliability and ease of repair. An engine-mounted control system helps create a self-contained package that is simpler to hook up and maintain.
MAN addresses the International Maritime Organization’s stringent Tier III emissions regulations by applying its new Selective Catalytic Reduction system to the 175D. The SCR uses horizontal mixing units to provide a homogeneous mixing of urea and exhaust gases. The system’s canisters are compact and modular so that they can be configured in an engine room or in a stack to fit a variety of vessels. The system uses MAN Truck & Bus’ patented AdBlue (urea) technology developed for on-road vehicles, combining it with MAN Diesel & Turbo engineers’ SCR experience, which results in reduced emissions and optimal engine performance.
SPECIFICATIONSEngine: MAN 175D
Engine Layout: V-12
Bore x Stroke: 6.89 x 8.46 inches (175 x 215 mm)
Head Material: Iron
Block Material: Iron
Piston Material: Steel
Power: 2,977 hp
Torque: 8,229 lb-ft
Emissions: IMO Tier III
Induction: MAN TCR12 turbocharger
Intercooler: Integrated seawater
Cooling System: Liquid-cooled
Fuel System: Modular common-rail
Lubrication System: Wet sump
Dry Weight: 18,739 pounds
Length: 104 inches
Width: 58 inches
Height: 84 inches
MAN Diesel & Turbomarine.man.eu/