Most Popular 2-Stroke Marine Propulsion Engines

There are many engine manufacturer designs that you will see on a vessel, but the most prominent players in the engine manufacturing industry are Wartsila (Previously SULZER) & MAN Diesel Turbo (Previously MAN and B&W).


The famous marine engines which were widely used as a ship propulsion plants are as follows:

Sulzer (Wartsila)

RD series It is the oldest engine series from SULZER and is very rarely seen in the shipping industry today. It is equipped with rotary exhaust valves and a fuel valve with a short spindle. The cylinder liner quills were of a wet type and placed only at the upper part. It has a pulse turbocharging system with no auxiliary blower fitted for supporting the scavenge pressure.


RND series One of the most famous designs of SULZER with the slogan of “Our Exhaust valves never burn” as this engine doesn’t have any. It has loop scavenging i.e. exhaust and inlet ports are provided in the liner. It was fitted with more liner quills at the bottom of the exhaust port and is of dry type. Auxiliary blowers are provided and a constant turbocharging system is adopted. It produces more power than the engines of the RD series.


RTA series It is the modern-day engine design with exhaust valves fitted. It has become very famous in modern shipping as it is a balanced blend of automation and mechanical engineering. It consumes less fuel and produces more power with three fuel valves in one cylinder.


RT Flex series It is the latest and the toughest engine from Wartsila Sulzer with maximum automation installed. It consists of a common rail fuel injection method and uses a fully integrated electronic system based on a high-performance computer eliminating parts like the fuel pump, fuel cam, chain drive, etc. resulting in reduced maintenance.


DF Series The dual-fuel engines allow ships to be operated on either LNG or conventional liquid marine fuels, including LFO, HFO, or liquid biofuel. Using LNG instantly and drastically reduces CO2, NOx, SOx, and particulate matter emissions. LNG is also well-established as a maritime fuel around the world, with mature legislation frameworks and robust bunkering infrastructure.


MAN Diesel Turbo

MAN B&W is another leading diesel engine manufacturer with the head office situated in Germany. It has different categories of engines for different users with the latest ME-B series complying with the latest norms and taking care of the ship owner’s economical criterion of selection.


KEF series It was introduced about 20 years ago and is incorporated with exhaust valves which are push rod operated and installed with a pulse type of turbocharging system. No servomotor was fitted in this engine and reversing is done with mechanical means.


KGF Series The KGF series was similar to the KEF series and consisted of an exhaust valve rotator with a roller bearing installed for that. In this engine, the reversing cam is held in a hub that is keyed into the shaft. The camshaft is turned in the same direction for reversing and the pressure required for reversing is about 40 bars. There is no direct link between the chain drive and the engine camshaft.


MC series The MC series engines are the most popular engines now and are fitted with electronic control units for better and safe operation of the engine. This engine is installed with VIT for economical fuel consumption and power production. Air is used for reversing the engine which moves the fuel pump cam follower from ahead to the astern position.

ME series It is the upgraded version of the MC engine with electronic automation installed for the safety and economy of the plant. They provide optimal combustion at all operations and speed with the smokeless operation.
ME-DF Series The ME-GI is MAN Diesel & Turbo’s dual-fuel, two-stroke, gas-injection engine which gives shipowners and operators the option of using either HFO or gas — predominantly natural gas but also LPG and methane.

Log in

Log in with Google

Log in with LinkedIn


Don’t have an account? Register Now