Most modern yachts utilize a reciprocating diesel engine as their prime power source. Due to their operating simplicity, robustness, and fuel economy. Compared to most other prime mover mechanisms.
The rotating crankshaft can be directly coupled to the propeller with slow speed engines. Or via a reduction gearbox for medium and high-speed engines. Or via an alternator and electric motor in diesel-
A diesel-electric transmission system includes a diesel engine connected to an electrical generator. Creating electricity that powers an electric traction motor.
There are several propulsion systems available. With different specifications:
A fan that transmits power by converting rotational motion into thrust.
Aa pitch propeller mounted on a steerable pod attached to the hull. Linked to the engines through either a direct mechanical link or diesel-
A ducted propellor or pump creates a jet of water. By forcing water through a nozzle.
The are several Marine Engine Manufacturers.
The most common are MTU, Caterpillar, MAN, Yanmar and Rolls Royce Marine.
We created this comparison of yacht / marine diesel engine specifications.
|MTU||2000||22-36 l.||400-1,939||536-2,600||1,800-2,450||IMO II / EPA III||400-500 l/h|
|MTU||4000||51-69 l.||746-4,300||1,000-5,765||1,500-2,100||IMO II / EPA III||800-1,000 l/h|
|MTU||1163||232 l.||3,600-7,400||4,825-9,925||1,200-1,250||IMO I / IMO II||1,496 l/h|
|MTU||8000||347 l.||7,200-10,000||9,655-13,410||1,150||IMO II / EPA III||1,600 – 2,100 l/h|
|CAT||C12||12 l.||492-526||660-705||2,300||IMO II||160 l/h (est.)|
|CAT||C18||18 l.||350-747||469-1,001||1800-2300||IMO II||260 l/h (est.)|
|CAT||C32||32 l.||1193-1417||1,600-1,900||2,300||IMO II / EPA III||300 l/h (est.)|
|CAT||3512C||58||1000-1765||1,640-2,366||1600-1800||IMO II / EPA III||800l/h (est.)|
|CAT||VM32C||37||6000-8000||8,000-11,000||750||IMO II||1200 l/h (est.)|
|MAN||i6-800||12 l||588||800||2,300||EPA III||158 l/h|
|MAN||V8-1200||16 l.||882||1200||1,200-2,100||EPA III||240 l/h|
|MAN||V12-1550||24 l.||1,140||1550||1,200-2,100||EPA III||299 l/h|
|MAN||v12-1900||24 l.||1,397||4900||1,200-2,100||EPA III||373 l/h|
|Rolls Royce||C25:33L6P||2000||2720||1,000||IMO II||182 l/h|
|Rolls Royce||B32:40V12P||6000||8160||750||IMO II||184 l/h|
|Rolls Royce||B33:45V12||7200||9800||750||IMO II||176 l/h|
Marine Engine Manufacturers
MTU Yacht Engines – Power. Passion. Partnership.
MTU is one of the world’s leading manufacturers of large diesel engines. And complete propulsion systems. The robust and durable engines reliably propel large ships. And heavy agricultural and rail vehicles, and industrial applications.
MTU series 4000 Engines
The 4000 series was launched in 1996. It is considered to be the first large diesel engine. The 4000 was designed enable increases in power by increasing displacement. It is common used in vessels, fast ferries and industrial machines.
Caterpillar Marine Engines
Caterpillar is a leading producer of marine power systems. CAT offers an outstanding marine diesel power range. And a complete continuously evolving product line of propulsion engines.
Cat Marine Diesel Engines set the standard for quality, performance, and reliability. An extensive power range and decades of experience result in a single source.
For total power solutions on board. Providing electronic marine engines, generator sets, motors, and vessel controls.
Throughout the power range, Cat engines have the power not just to accelerate, but to exhilarate. Continual advancements in electronic engine technology mean Cat marine engines satisfy worldwide emissions regulations. And still deliver a surge of adrenaline whenever and wherever required.
Cat also produces auxiliary engines. Caterpillar marine generator sets provide efficient power, with reduced operating costs and maximize productivity and up-
MAN Yacht Engines
High power alone is not enough for pure exhilarating performance. Fascinating horsepower paired with the best of comfort is a central demand of engines for yachts and pleasure craft.
Innovative MAN diesel engines power luxury boats into the planing phase quickly. Where they run with distinct smoothness –
For yachts and pleasure craft, MAN Engines offers powerful and compact high-
With extremely low fuel consumption. The advantages of V-
The engines are delivered ready for installation. And are designed for optimum performance. In the various conditions of deployment and operation.
After installation MAN Engines offers to examine and pass off the engine. And to carry out extensive commissioning. The boat owner receives an additional guarantee.
With the Gold Standard Certificate on acceptance of the engine. All engines comply with the internationally applicable exhaust-
Rolls Royce Marine
Rolls Royce medium-
Emission standards are the legal requirements governing air pollutants released into the atmosphere. Emission standards set quantitative limits on the permissible amount of specific air pollutants that may be released from certain engines.
In the yacht/marine industry there are two common sets of emission standards: the IMO and the EPA.
IMO Marine Engine Regulations
The International Maritime Organization (IMO) is an agency of the United Nations which has been formed to promote maritime safety.
IMO ship pollution rules are contained in the “International Convention on the Prevention of Pollution from Ships”, known as MARPOL
The NOx emission limits of Regulation 13 of MARPOL Annex VI apply to each marine diesel engine. With a power output of more than 130 kW installed on a vessel.
Tier Date KW< 130 KW <2,000 KW >2,000
IMO I 2000 17.0 45*(n-
IMO II 2011 14.4 44*(n-
IMO III 2016 3.4 9*(n-
EPA Marine Engine Regulations
The United States Environmental Protection Agency (EPA) has set EPA standards for exhaust and evaporative emission. To reduce the environmental impact from marine spark-
The emission standards require manufacturers to control exhaust emissions from the engines. And evaporative emissions from fuel tanks and fuel lines.
Tier Date KW< 130 KW <2,000 KW >2,000
EPA I 2004 17.0 45*(n-
EPA II 2011 75% of I 75% of I 75% of I
IPA III 2016 20% of I 20% of I 20% of I