Moteurs Baudouin (Weichai) Marine Engines

What Baudouin is today

Moteurs Baudouin builds high-speed four-stroke diesel engines for commercial vessels, gensets, and a smaller line of leisure and industrial units. The company traces to 1918 in Marseille and keeps its design center and assembly at Cassis, on the Mediterranean coast east of Marseille. Since 2009 it has been a subsidiary of Weichai Power, one of China’s largest diesel and powertrain groups.

The marine catalog is organized around three engine blocks in the modern M series: the M26, the M33, and the larger M55, with smaller displacement engines below them for light commercial and auxiliary duty. These are high-speed engines, which here means rated speeds in the roughly 1,500 to 2,300 rpm band, distinct from the medium-speed and slow-speed two-stroke world that powers deep-sea cargo ships. For the engine-class boundaries that put Baudouin firmly in the high-speed bracket, see high-speed four-stroke marine engines and four-stroke marine diesel engine fundamentals.

Baudouin sells into fishing fleets, workboats, pilot boats, fast ferries, patrol craft, yachts, and into the genset market for both marine and land use. The combination is the point of the brand under Weichai: French engineering and a century-old marine name, paired with Chinese manufacturing scale and a parent that supplies engines by the hundred thousand into trucks and machinery. That pairing is what lets a once-regional builder quote globally against Cummins, Volvo Penta, Caterpillar, MTU, and Scania.

Origins in Marseille, 1918

Moteurs Baudouin was founded in 1918 at Marseille by the Baudouin family. The early business built small marine diesels for the Mediterranean: fishing boats working out of the southern French ports, coastal traders, and small workboats. Marseille was the natural market. It was France’s largest port, and the fishing and coastal fleets there needed engines that would run hard for long hours on poor fuel and tolerate salt, heat, and minimal maintenance.

That duty cycle shaped the early product. Fishing-vessel engines spend long stretches at high load, then idle, then load again, and they sit in hulls where access for service is tight. An engine for that work has to be simple to fix and forgiving of neglect. Baudouin built a regional reputation on exactly that, and the name stayed attached to small and mid-size commercial marine diesels through the rest of the twentieth century.

Production moved from Marseille proper to Cassis, a small town along the calanques coast a short distance east. Cassis is better known for wine and tourism than for industry, but the Baudouin works there has been a fixture of the local economy for decades, and it remains the company’s headquarters and engineering base.

The mid-century product

Through the 1950s, 1960s, and 1970s Baudouin developed successive small marine diesel families. The engines sat in the low hundreds of horsepower for most of that period, growing over time as fishing vessels grew and as workboat and small-ferry demand widened the range. The designs used marine-specific features that a truck or tractor engine does not need: heat-exchanger and keel-cooling arrangements, marine gearboxes, raw-water pumps, and corrosion protection for a saltwater environment.

The customer base stayed concentrated in the Mediterranean and in markets tied to France through trade and former colonial links, particularly North Africa. That concentration was a strength while those fleets were renewing and a weakness once they stopped. Do not read the early Baudouin as a global brand. It was a respected regional builder, and the regional base both made it and, by the 2000s, nearly unmade it.

The cooling and installation choices of those decades still shape the marine engine today. A working hull rarely has room for a large dry-exhaust stack or an open radiator, so marine diesels are cooled through a closed jacket-water circuit dumped to seawater across a heat exchanger, or through a keel cooler welded to the hull, with the exhaust wet, mixed with the raw cooling water before it leaves the boat. Charge-air cooling matters as much, because a turbocharged engine’s intake air is hot after compression, and cooling it raises the air density the engine can burn. Higher charge-air density at a controlled temperature is one of the levers that took the small marine diesel from the low hundreds of horsepower of the mid-century range to the power levels of the modern M-series blocks.

The squeeze of the 2000s

By the 2000s the independent Baudouin faced the same pressure that closed or merged many mid-size European engine builders. Korean, Japanese, and Chinese makers competed hard on price in the small-and-medium marine bracket. Wartsila and MAN were consolidating the larger end of the market and could spread emissions and development costs over far higher volumes. The Mediterranean fishing fleet, Baudouin’s historic core, was shrinking under catch quotas and decommissioning programs, so fleet renewal slowed and with it the demand for new engines.

Emissions rules added a fixed cost that a small builder could not easily carry. Meeting the IMO NOx tiers and the parallel EU and US off-road and marine standards meant continuous investment in combustion development, injection equipment, and aftertreatment. A company selling a few hundred engines a year cannot amortize that the way one selling tens of thousands can. The 2008 financial crisis then removed the slack. Baudouin’s order book and finances could not support the firm as an independent going concern, and it entered restructuring.

The 2009 Weichai acquisition

In 2009 Weichai Power acquired Moteurs Baudouin. Weichai is headquartered in Weifang, in Shandong Province, China. It is one of China’s largest diesel-engine makers, with its main volume in heavy trucks, buses, construction machinery, and industrial power, and it sits within the wider Shandong Heavy Industry / Weichai group. The listed entity, Weichai Power Co., Ltd., is a public company, and over the years the group has taken stakes across an engine and equipment portfolio that includes forklift and warehouse-equipment maker KION (which owns the Linde and STILL brands), the U.S. fuel-cell and powertrain firm Ballard Power Systems, and the marine-and-defense engine maker Ferretti and others through its broader holdings.

Baudouin gave Weichai several things that volume truck-engine production does not: a European marine brand with a century of history, an engineering team experienced in marine diesels and the marine emissions path, an established marine dealer and aftersales footprint in Europe and the Mediterranean, and a product line in the high-speed marine bracket that Weichai could push into export markets through its own commercial network. For Weichai, marine high-speed power was a segment to enter, and buying an established name was faster than building one.

Weichai kept the Baudouin brand, kept Cassis as the headquarters and a center of engineering, and invested in the product line rather than stripping it. That choice matters for how the brand reads in the market. A buyer who keeps the French name, the French engineering base, and the marine-specific design competence is selling continuity, not a relabeled truck engine. The official corporate sites for both the parent group and Baudouin set out this structure and the marine product range.

Repositioning as a global high-speed brand

Under Weichai the strategy shifted from a Mediterranean regional supplier to a global high-speed marine brand. Two assets made that possible at once. From the French side came marine engineering heritage, a marine-credible name, and a dealer network that understood marine service. From the Chinese side came manufacturing scale, component sourcing at volume, a global commercial network built for trucks and machinery that could carry marine engines into new regions, and a balance sheet that could fund the multi-year emissions and product development that the independent Baudouin could not.

The practical result is a wider catalog, a faster cadence of new engine introductions, and a sales reach into Africa, South and Southeast Asia, the Middle East, and Latin America that the standalone French firm never had. Baudouin still leans on the French marine heritage in how it presents itself, because that heritage is a selling point against rivals whose marine high-speed lines also descend from on-highway or industrial blocks. The brand sits inside the wider field mapped in the marine engine makers directory.

The M-series engine families

The modern marine line is built around the M-series blocks. The naming convention follows the engine bore class, so the family number broadly tracks engine size, with cylinder count and configuration appended (inline or vee) to set the displacement and power within each block. Always confirm the exact rating, speed, and configuration for a given application against the current Baudouin marine documentation, because ratings are revised across model years and across the commercial-duty classifications.

The logic of a block family is that one cylinder design is built in several cylinder counts to cover a power range without designing a new engine for each rating. An inline-six and a vee-twelve off the same block share the bore, the stroke, the piston, the head, and most of the wear parts, but the vee has twice the cylinders and so roughly twice the displacement and power. That sharing is what makes a block family economic to build and to support: a dealer stocks one set of cylinder-kit parts for the whole family, and an operator who runs a six and a twelve off the same block carries one parts inventory. It is also why the M-series numbering reads the way it does, with the family number fixed by bore and the variant set by how many of those cylinders are bolted together.

M26

The M26 is the workhorse mid-block of the marine range. It is offered in inline-six and vee configurations and serves fishing vessels, workboats, small ferries, pilot boats, and gensets. The M26 is the block most associated with Baudouin’s traditional commercial customers: the boats that run long hours at high load and need an engine that is straightforward to maintain in a working hull. Designations within the family follow the cylinder-and-configuration pattern, so a six-cylinder inline and a twelve-cylinder vee share the bore class but differ in displacement and rated output.

M33

The M33 is the larger block, used where the M26 runs out of power for the duty. It covers larger workboats, fast ferries, patrol and law-enforcement craft, and higher-output gensets. As with the M26, the family spans inline and vee configurations, and the higher cylinder counts in the vee layout reach the upper end of Baudouin’s marine power band. The M33 is where Baudouin competes most directly with the high-speed lines from MTU, Caterpillar, and Cummins in the patrol-boat and fast-commercial segment.

M55

The M55 is the largest block Baudouin offers in the high-speed marine line, positioned above the M33 for the highest-power applications in the catalog. It extends the brand into power levels that put it against the larger high-speed engines from the major rivals, while staying inside the high-speed four-stroke class rather than crossing into medium-speed territory. As always, confirm the current rating and configuration against Baudouin’s published marine data for the specific commercial-duty class.

Smaller blocks and gensets

Below the M26 sit smaller-displacement engines for light commercial craft, leisure boats, and auxiliary and emergency-genset duty. The genset side of the business is substantial, both as marine auxiliary power and as land-based and standby generation, and it shares engine technology with the propulsion line. For how auxiliary sets are sized and rated aboard ship, see marine auxiliary engines and generators. For a worked high-speed emergency set, the companion calculator is the emergency genset (high-speed diesel) tool.

A marine genset is a different engineering problem from a propulsion engine even when the block is shared. The genset runs at a fixed speed set by the alternator’s pole count and the grid frequency it serves, so a 50 Hz, four-pole set holds 1,500 rpm and a 60 Hz, four-pole set holds 1,800 rpm, regardless of electrical load. The engine’s governor has to hold that speed within tight limits as load steps on and off, because a ship’s electrical bus cannot tolerate the frequency excursions that loose speed control would cause. That puts the demand on the governing and fuel-injection control rather than on the speed range, which is why genset ratings and propulsion ratings off the same block read differently.

Baudouin’s genset offering spans marine main and auxiliary generation, harbor and standby power, and land-based prime and standby duty. The land-based business matters commercially because it widens the volume base the marine line rides on, and because the parent Weichai is already a large player in generator-set engines for industrial and standby use. Sharing development across marine and land gensets is part of how the brand carries the emissions and control-system investment that a marine-only volume could not fund alone.

Marine duty classifications

The single most common error in comparing high-speed marine engines is reading a rating without its duty class. Marine engine makers publish several ratings off the same block, each tied to an allowed pattern of use over time. A continuous-duty rating, the kind a fishing boat or a workboat needs, allows full power for unlimited hours and is the lowest of the ratings. A heavy-duty or intermittent rating allows full power for a defined fraction of operating hours, suited to ferries and supply boats that run at high load but not constantly. A high-output or pleasure rating allows full power only for short bursts within a low annual-hours envelope, suited to fast yachts and patrol craft that sprint and then cruise.

The same physical engine can carry all of these, and the kilowatt number climbs as the duty gets lighter, because a lighter duty trades engine life and overhaul interval for peak output. So a Baudouin block quoted at one power for fishing duty and a higher power for patrol duty is not two engines; it is one engine in two ratings. Any comparison against a rival’s data sheet has to line up the duty classes first, or it compares a continuous rating against a sprint rating and reaches the wrong conclusion. This is why every figure in this article travels with the instruction to confirm the duty class, and it is the discipline a buyer applies before trusting any single power number.

How the engines are characterized

The headline numbers a buyer compares across high-speed engines are rated power, rated speed, and fuel consumption at the rating, plus the duty classification that says how long the engine may hold that rating. Two engines with the same kilowatt rating can differ sharply once duty class, fuel consumption, and the emissions package are included. The sections below set out the standard measures, with the calculators that compute each one. None of the figures here are quoted for a specific Baudouin model; the point is the method, which applies to any high-speed marine diesel.

Brake mean effective pressure

Brake mean effective pressure (BMEP) normalizes an engine’s output against its displacement and speed, so it lets you compare a small high-speed engine and a large one on the same scale. A higher BMEP means more work extracted per liter per cycle, which is the lever modern high-speed diesels pull through higher boost and better combustion. It is the cleanest single number for how hard a design is worked.

A high-speed marine block in heavy commercial duty is rated at a lower BMEP than the same block in a light-duty pleasure rating, because the continuous-duty rating trades peak output for life between overhauls. That is why the duty classification has to travel with any power number. A patrol-boat rating and a fishing-boat rating off the same block are not the same engine in service.

Specific fuel consumption and thermal efficiency

Specific fuel oil consumption (SFOC), in grams of fuel per kilowatt-hour, is the operator’s running-cost number. It converts directly into brake thermal efficiency: the lower the SFOC, the more of the fuel’s energy reaches the propeller shaft. For high-speed marine diesels the best points sit in the low 190s of grams per kilowatt-hour at the optimum load, rising at part load and at the rating extremes. Confirm any specific figure against the manufacturer’s test-bed data for the rating in question.

SFOC is sensitive to ambient conditions, charge-air temperature in particular, which is why test-bed numbers are quoted at reference conditions and corrected for site. A hot engine room or a hot day raises charge-air temperature and shifts the consumption number.

The fuel-consumption side of the comparison is where Baudouin’s parent helps. Weichai’s truck-engine volume funds the injection and combustion development that drives SFOC down, and that development carries into the marine blocks. For the propulsion-side relationship that turns consumption into voyage cost, the cube law below is the starting point.

Speed, power, and the cube law

For a vessel at speed, the power demand rises with roughly the cube of speed, so fuel burn climbs steeply as a fast boat is pushed harder. This is why a patrol or fast-ferry operator cares about the engine’s behavior across the speed range, not just at the top rating, and why slowing a fast craft even a little saves a large fraction of the fuel.

The cube relationship is the single most useful piece of math for a fast-craft operator deciding a service speed. It is also why high-speed marine engines are rated by duty class: a hull that needs the full rating only in short sprints can run a higher rating than one that holds speed continuously.

Carbon dioxide per kilowatt-hour

Carbon dioxide output follows directly from fuel burn, because the carbon in diesel oxidizes to a fixed mass of CO2 per unit of fuel. So CO2 per kilowatt-hour is just SFOC scaled by the fuel’s carbon factor, which makes thermal efficiency and carbon intensity two views of the same number on conventional diesel.

That fixed link is exactly why alternative fuels matter for the carbon side: on diesel, the only way to cut CO2 per kilowatt-hour is to cut SFOC, and the room there is small. Switching the fuel is the larger lever, which is the subject of the methanol and dual-fuel section below.

NOx Tier III and SCR

Marine engine emissions of nitrogen oxides are controlled under MARPOL Annex VI, Regulation 13. The regulation sets three tiers by build date and operating area. Tier I and Tier II are global limits keyed to engine rated speed; Tier III is the strict standard that applies to engines on ships built from 1 January 2016 (and later dates for some regions) when operating inside designated NOx Emission Control Areas. The Tier III limit is roughly a 75 to 80 percent cut from Tier II for the same engine speed class.

For high-speed four-stroke diesels like Baudouin’s, the practical route to Tier III is selective catalytic reduction (SCR). SCR injects a urea solution into the exhaust ahead of a catalyst, where ammonia from the urea reacts with NOx to form nitrogen and water. The technology is mature on marine engines and is the same chemistry, scaled, that the parent Weichai applies on its on-highway truck engines under the equivalent road standards. For the engineering of SCR as an aftertreatment route, see SCR retrofit on two-stroke engines, and for how the Tier III obligation is met in practice across engine types, Tier III compliant two-stroke engines.

The compliance picture differs by engine class. A high-speed engine has a hotter, more variable exhaust than a slow-speed two-stroke, which changes the SCR design problem but does not change the basic approach. Baudouin offers Tier III packages on the relevant marine blocks, and the same engine can be sold in a Tier II configuration for vessels and areas where Tier III does not apply. Confirm the certified emissions configuration for the build date and operating area against the engine’s EIAPP certificate, because the same engine model can carry more than one emissions configuration.

The air-side of the combustion that sets engine-out NOx in the first place comes down to the air-fuel ratio and the resulting peak combustion temperatures. Leaner mixtures and managed combustion timing trade some efficiency for lower engine-out NOx before any aftertreatment, and the air-fuel ratio calculator sets out that relationship.

NOx forms in the diesel flame because the high local temperatures of combustion let atmospheric nitrogen and oxygen react, and the hotter and longer the peak, the more NOx is made. So the engine-side controls that cut NOx all work by lowering or shortening the peak temperature: retarding the injection timing, raising the air-fuel ratio to dilute the charge, cooling the charge air, or recirculating a fraction of the exhaust to slow combustion. Each of those costs a little fuel efficiency, which is the trade at the heart of diesel emissions design. The engine maker sets the combustion to a Tier II engine-out level that the efficiency penalty can bear, then SCR cleans up the remaining gap to Tier III in the exhaust rather than in the cylinder. That split, modest engine-out reduction plus aftertreatment, is why an SCR-equipped engine can hold Tier III without paying the full efficiency cost of meeting it through combustion alone.

The urea consumption of the SCR system is a running cost the operator carries alongside fuel. The dosing tracks engine load and NOx output, so a vessel that runs hard inside a control area consumes urea solution at a rate that has to be planned into the voyage and the bunkering, the same way diesel is. The catalyst itself is a service item with a finite life, and its performance depends on holding the exhaust in a temperature window where the chemistry works, which is part of why high-speed engines with their variable exhaust temperatures need careful SCR design.

Dual-fuel and the methanol direction

The harder emissions target is carbon, and on conventional diesel the room to cut it is small, because CO2 per kilowatt-hour is locked to fuel burn. The industry answer is to change the fuel. Baudouin, in line with the rest of the high-speed marine sector and with its parent’s powertrain ambitions, is developing engines that run on lower-carbon fuels, with methanol among the leading candidates for the high-speed bracket.

Methanol is liquid at ambient conditions, which makes its storage and bunkering far simpler than the cryogenic handling that LNG needs, and that simplicity is part of why it suits smaller vessels and the high-speed segment. Burned in a marine engine, methanol cuts sulfur and particulate emissions to near zero and lowers CO2 per unit of energy, and it can be produced as a renewable fuel from biomass or from captured carbon and green hydrogen, which is the path to a genuinely low-carbon lifecycle. For the fuel’s properties, engine configurations, and the safety and bunkering questions, see methanol marine engines overview.

Most marine methanol engines are dual-fuel: they run on methanol with a small diesel pilot for ignition and can fall back to diesel where methanol is not available. That fallback matters during the years when methanol bunkering is thin, because it lets an owner buy the engine before the fuel network is complete. Hydrogen and hybrid-electric arrangements are also in development for the smaller and coastal end of the range, where battery support and shore power are practical. Treat all of this as direction rather than catalog: confirm what is actually available for order against current Baudouin marine documentation, and do not assume a methanol variant exists for a given block until the manufacturer lists it.

Carbon intensity also feeds the wider efficiency rules that now apply to ships, including the Energy Efficiency Existing Ship Index. For the regulatory measure that ties engine power limits to a ship’s design carbon intensity, see what is EEXI. The EEXI framework bears more on larger ships than on the small craft Baudouin mostly powers, but the same logic of capping power to cap carbon intensity runs through the whole regime.

The dealer and aftersales network

A marine engine is bought as much for its service network as for its data sheet, because an engine that cannot be supported in the ports a vessel works is a liability regardless of how good the design is. Baudouin sells and supports through a network of regional distributors and service partners, and the reach of that network is one of the clearest changes Weichai ownership brought. The independent firm was strong in the Mediterranean and in markets tied to France; the Weichai-era firm carries the brand into Africa, the Middle East, South and Southeast Asia, and Latin America through the parent’s wider commercial presence.

Aftersales for a commercial marine engine covers genuine spare parts, factory-trained service, overhaul support, and warranty across a service life measured in tens of thousands of running hours. For a fishing or workboat operator, parts availability and turnaround in the working region decide the buying choice as much as fuel consumption does. This is the same calculation that favors the established global brands, and matching their service reach is exactly what Weichai’s network is meant to do for Baudouin.

The economics of a commercial engine run over its whole life, not just the purchase price. A fishing or workboat engine in continuous duty can log several thousand running hours a year, so over a decade it accumulates the kind of hours that bring it to a major overhaul. The cost that matters is the total of fuel burned across those hours, the urea for the SCR system inside control areas, the scheduled service parts, and the downtime when the boat is out of the water for an overhaul. A small advantage in SFOC compounds across tens of thousands of hours into a sum that can exceed the difference in purchase price between two engines, which is why the fuel-consumption math earlier in this article is not academic for a commercial operator.

Parts logistics is the other half of that economics, and it is where a global parent changes the picture. An engine maker with depots and trained dealers in a region can turn a failed injector or a worn bearing around in days; one without that presence leaves a boat idle while a part ships from another continent. For a vessel earning its keep by being at sea, idle days are direct lost revenue, so the value of a dense service network is measured in avoided downtime, not in the parts margin. Carrying Baudouin into Weichai’s existing regional commercial network is meant to close exactly that gap against the incumbents.

Where Baudouin sits against its rivals

The high-speed marine diesel segment is crowded with strong names, and Baudouin competes against most of them in the commercial-and-patrol bracket. The comparison below is qualitative and positional; it does not quote model-for-model ratings, which change across model years and duty classes and must be checked against each maker’s current data.

Cummins is the volume leader across small and mid high-speed marine, with the QSK and B/C series and a deep service network; its marine engines descend from a very large on-highway and industrial base, the same structural advantage Weichai gives Baudouin. The corporate background is in Cummins marine corporate history. Volvo Penta is strong in the leisure and light-commercial bracket and in pod-drive integration with its D-series engines and IPS system; see Volvo Penta marine engines. Caterpillar covers a wide marine range and, through its MaK line, reaches up into medium-speed; the history is in Caterpillar marine corporate history.

MTU, part of Rolls-Royce Power Systems, holds the premium fast-craft and high-power-density position, particularly in yachts, fast ferries, and naval craft, with its Series 2000 and 4000 engines; the corporate thread is in Rolls-Royce Power Systems and MTU corporate history. Scania competes hard in the mid high-speed commercial bracket with its modular DI and V8 marine engines, again drawing on a very large truck-engine base. Yanmar is strong in fishing, leisure, and light commercial, especially in Asia; see Yanmar marine engines.

Baudouin’s pitch into that field is the combination its rivals each have one half of. Like Cummins and Scania it draws on a huge truck-engine parent for development scale and component cost. Like Volvo Penta and MTU it carries a European marine name with marine-specific engineering. Few rivals carry both a major non-marine engine parent and a century-old European marine brand at once, and that pairing is the argument the Weichai-era Baudouin makes to a buyer choosing between equally capable data sheets. Whether the pairing wins a given order still comes down to the rating, the duty class, the price, and the service network in the working region.

Compression ratio is one of the design choices that separates these engines under the hood, setting the trade between efficiency, peak cylinder pressure, and combustion behavior on a given fuel. It is a useful single number when reading across competing high-speed designs, and the compression ratio calculator computes it from bore, stroke, and clearance volume.

Industry context

Baudouin is one of several European marine engine names that now operate under non-European ownership. The pattern recurs across the sector: Sulzer’s two-stroke business passed to Wartsila and then into WinGD, with China’s CSSC group taking a controlling stake in WinGD; MaK went to Caterpillar; Stork-Werkspoor went to Wartsila; Pielstick passed through to MAN Energy Solutions, now branded Everllence. Baudouin to Weichai sits in that line, with the distinction that the French name, the French engineering base, and the Cassis works were kept rather than absorbed.

The case is often cited as a working model for Chinese acquisition of a distressed European industrial firm: the brand survived, the engineering base survived, the product line widened, and the jobs at Cassis stayed, in a way that an independent firm in financial trouble could not have funded on its own. Read it as evidence that foreign ownership and continued European manufacturing are not in conflict when the buyer treats the brand and the engineering as the asset. The contrast is with acquisitions that move production out and keep only the badge, which is not the Baudouin story.

There is a wider point about where high-speed marine power is going. The segment is consolidating around makers backed by very large non-marine engine volumes, because the cost of meeting each new emissions tier and of developing alternative-fuel combustion is fixed and rising, and only high volume amortizes it. Cummins and Scania carry truck-engine volumes; Caterpillar and MTU carry industrial and rail; Weichai carries one of the largest truck and machinery engine bases in the world. A purely marine builder selling a few hundred engines a year cannot fund the same development, which is the structural reason the independent Baudouin reached the end of its road in 2008 and the reason its survival ran through a large engine parent rather than through a marine buyer.

The methanol and dual-fuel transition raises that bar again. Developing a marine engine that burns methanol with a diesel pilot, certifying it, and supporting the fuel system in service is a multi-year program that only a maker with scale and a committed parent can carry through the years before the fuel network catches up. Baudouin’s place in that transition depends less on its century of marine heritage than on whether Weichai keeps funding the development, which on the evidence of the post-2009 investment it has. The heritage sells the engine; the parent builds it.

Limitations

This article is a corporate and technical profile, not a specification sheet. It deliberately does not quote exact power, speed, fuel-consumption, weight, or emissions figures for individual Baudouin models, because those ratings are revised across model years and across commercial-duty classifications, and a number copied from one source can be wrong for the engine actually on offer. Always confirm the rating, the duty class, the emissions configuration, and the certified data against current Moteurs Baudouin marine documentation and the engine’s own certificates before relying on any figure.

The formula-cards above present general high-speed-diesel relationships. They are the correct method for comparing engines, but they are not tuned to any specific Baudouin model and will not reproduce a manufacturer’s test-bed result without that model’s actual inputs. SFOC, BMEP, and CO2-per-kilowatt-hour all depend on the rating point, the ambient and charge-air conditions, and the fuel, so a hand calculation is an estimate, not a substitute for certified data.

The alternative-fuel section describes direction, not a current order book. The marine high-speed sector’s move toward methanol and dual-fuel is real and ongoing, but whether a methanol or hydrogen variant exists for a particular Baudouin block at a particular date must be checked against the manufacturer’s published range. Do not assume availability from the direction of travel. Finally, the competitor comparison is positional and qualitative; the segment is genuinely close, and the right engine for a given vessel depends on the specific duty, the price, and the service network in the region where the vessel will work.

Related calculators

• Engine BMEP calculator
• Brake thermal efficiency from SFOC
• SFOC sensitivity to air temperature
• CO2 emission per kWh
• Cube-law fuel vs speed
• Air-fuel ratio
• Compression ratio
• Emergency genset (high-speed diesel)

See also

• Marine engine makers
• Cummins marine corporate history
• Volvo Penta marine engines
• Caterpillar marine corporate history
• Rolls-Royce Power Systems and MTU corporate history
• Yanmar marine engines
• High-speed four-stroke marine engines
• Four-stroke marine diesel engine fundamentals
• Marine auxiliary engines and generators
• SCR retrofit on two-stroke engines
• Tier III compliant two-stroke engines
• Methanol marine engines overview
• What is EEXI