Cummins Marine: Corporate History

Cummins Marine is the marine engine business of Cummins Inc., one of the largest independent diesel engine makers in the world and a leading supplier of high-speed marine engines for inland waterway, fishing, workboat, supply, and naval applications. Cummins competes directly with Caterpillar Marine in the high-speed segment, and its agreement to acquire Rolls-Royce Power Systems and the MTU brand would put it at the front of the global high-speed market. The engine families discussed here sit inside the broader class of high-speed four-stroke marine engines, and the per-cylinder output figures pair with the QSK-series calculators on this site.

Cummins Inc. corporate origins

Cummins Engine Company was founded on 3 February 1919 in Columbus, Indiana, by Clessie Lyle Cummins, a mechanic and machinist, with financial backing from the local banker William Glanton Irwin. The bet was specific: that Rudolf Diesel’s compression-ignition engine, then a heavy stationary technology, could be made small and reliable enough for mobile use. Clessie Cummins held more than thirty patents over his career, and the early company spent its first decade losing money while it proved the diesel could run a truck.

The proof came in public. In 1929 Cummins fitted a diesel into a used Packard limousine and drove it from Indianapolis to New York, the first diesel-powered passenger-car trip across that route. In 1931 a Cummins-powered car ran at the Indianapolis Motor Speedway, and through the 1930s the company set distance and economy records to convince a skeptical trucking market. Irwin’s money kept the firm alive until the on-highway diesel finally caught on in the late 1930s. That history matters for the marine business because Cummins built its engineering culture around high-speed diesels for mobile duty, not the slow stationary or marine machines that defined the era.

Through the twentieth century Cummins grew into one of the dominant on-highway diesel suppliers, with strong positions in heavy trucks, motorhomes, agricultural equipment, mining machinery, and power generation. The company reorganized as Cummins Inc., is headquartered in Columbus, Indiana, and trades on the New York Stock Exchange under the ticker CMI. Global expansion came through joint ventures and acquisitions across Europe, China, India, and Brazil. The Tata Cummins venture in India, the Dongfeng Cummins and Beijing Foton Cummins ventures in China, and the Komatsu Cummins ventures in engines and components are among the long-running structures that gave the company manufacturing reach without wholly owned plants in every market.

How a truck-engine maker entered marine

Cummins didn’t start as a marine company. The marine business grew out of the truck and industrial engine lines, which is why the early marine catalog reads like a marinized truck-engine list rather than a clean-sheet ship-engine range. A diesel that had to survive a fully loaded Class 8 truck climbing a grade for hours was already built for the continuous, vibration-heavy duty that a workboat demands. Marinizing it meant adding heat exchangers, raw-water or keel cooling, marine gears, and corrosion protection, then re-rating the power curve for the duty cycle.

This shared lineage created a structural advantage that still shapes the competition. A towboat operator on the Mississippi, a long-haul trucking firm, and a mining contractor could all run Cummins power and draw on the same dealer network, the same parts catalog, and technicians trained on the same engine families. Caterpillar had the same logic through its construction-equipment dealers. The point is that high-speed marine, unlike the low-speed two-stroke main-engine market, is won as much on service coverage as on the engine itself.

Through the 1970s and 1980s Cummins Marine grew into a major participant in US inland waterway towboat and barge propulsion, and in commercial fishing along both US coasts. The NT-855 and KT/KTA-series engines of that era, the mechanically injected forerunners of the modern range, powered a generation of workboats. Many are still in service, which is itself a selling point: an engine family with thirty or forty years of field history carries a known maintenance profile that a buyer can price.

The K-series is the heart of this lineage. The original K19, K38, and K50 were big-bore, heavy-duty mechanical-injection engines built for the duty cycles that destroy lighter engines: continuous mining-truck haulage, locomotive traction, prime-power generation, and marine propulsion. Their construction reflects that duty, with replaceable wet cylinder liners, individually serviceable cylinder heads, and a block stiff enough to take repeated rebuilds. A K-series block is designed to be overhauled in place and run again, not scrapped, which is why the engines hold residual value in working fleets. The QSK range carries that mechanical core forward under electronic control, so a yard that knows the old K engines already knows most of the new ones.

The K heritage also explains why Cummins didn’t have to invent a marine engine from scratch when emissions rules tightened. The base engines were already proven over millions of field hours across mining, rail, and power generation. What changed through the 2000s was the fuel system, the control electronics, and the aftertreatment, not the fundamental block and running gear. That gave Cummins a faster, cheaper path to compliant marine engines than a clean-sheet design would have, and it kept the parts and service knowledge in the field current.

The QSK series: the modern high-speed flagship

The QSK series, introduced through the 2000s, is the modern Cummins high-speed marine and industrial flagship. The “QS” denotes the Quantum System electronic full-authority fuel and engine management that replaced the earlier mechanical injection, and the “K” carries the K-series heavy-duty heritage forward. Electronic control let Cummins meet tightening emissions limits, add diagnostics, and tune the same base engine to different duty ratings without changing hardware. The family runs from the in-line six QSK19 up to the V16 QSK95.

The QSK marine range covers the band that matters most for commercial workboats and inland craft. These are four-stroke turbocharged engines, and the per-cylinder mean-effective-pressure logic that sets their continuous ratings is the same logic that governs any four-stroke marine diesel. Cummins publishes ratings in tiers, typically a continuous rating for vessels that run near full load most of the time, an intermediate rating, and a high-output rating for light-duty or planing craft that spend most hours at part load.

The QSK19 is the in-line six entry point to the heavy-duty K range, with marine ratings in the area of 380 to 600 kilowatts depending on the duty tier. It carries the design DNA of the older K19 but with electronic control and modern aftertreatment options.

The QSK38 is a V12 sitting in the 750 to 1,200 kilowatt band, a common choice for medium workboats, ferries, and supply vessels where a single engine or a twin-engine pair suits the hull. The QSK50 and QSK60 are V16 engines: the QSK50 covers roughly 1,000 to 1,500 kilowatts and the QSK60 roughly 1,500 to 2,200 kilowatts.

The QSK60 is the workhorse of the larger inland and offshore-support fleets and competes head-on with the Caterpillar 3512 and 3516 and the MTU Series 4000. Its per-cylinder mean-effective-pressure figure is the design lever that sets how hard each of the sixteen cylinders works at the maximum continuous rating.

At the top of the range sits the QSK95, a V16 launched in 2014. It took Cummins into the upper high-speed output band, with marine ratings around 2,800 to 3,000 kilowatts, putting it against the Caterpillar 3516E and the MTU Series 4000 V20 in marine, rail, and standby-power duty. The QSK95 was the first clean-sheet Cummins engine of that displacement class in decades, and Cummins built a dedicated assembly line for it at Seymour, Indiana. Its first high-profile application was in rail, powering high-speed locomotives, before it spread into marine and standby power. The engine uses a modular two-stage turbocharging arrangement and a high-pressure common-rail fuel system, both of which are what let a high-speed engine of that size meet modern emission tiers while holding fuel efficiency.

The reason the QSK95 matters to the competitive map is bore size. A high-speed engine makes its power from displacement turning fast, and the practical ceiling on a single high-speed V16 sits where the QSK95, the Caterpillar 3516, and the MTU 4000 cluster. Above that band, buyers move to medium-speed engines turning at 720 to 1,000 revolutions per minute, which is the segment Caterpillar serves with the MaK line and Cummins does not. So the QSK95 marks the top of where Cummins competes on its own engines, and it is exactly the band the MTU Series 4000 would reinforce after the Rolls-Royce Power Systems deal.

Across the whole QSK family, the rating philosophy is what an operator buys into as much as the hardware. Cummins assigns a duty-cycle rating, often labeled by the fraction of time the engine is expected to run at or near full load, and de-rates the published power as that fraction rises. A continuous-duty rating for a vessel that runs flat-out most of the time sits well below the peak number quoted for a pleasure craft that touches full power for minutes a day. Matching the rating to the real duty cycle is the single most consequential decision in engine selection, because an over-rated engine run hard wears out early and an under-rated engine costs capital it never uses.

The QSM11, QSC, QSL, and QSB lines

Below the K-series sit the mid-bore engines that came from the truck and industrial lineage. The QSM11 is an in-line six of about 10.8 liters, a marinized descendant of the Cummins M11 truck engine, used in planing and semi-displacement craft, smaller workboats, and as a generator prime mover. It bridges the gap between the small B and C engines and the heavy K-series.

The QSL9 is a 8.9-liter in-line six, the QSC8.3 a 8.3-liter six, and the QSB family covers the 5.9- and 6.7-liter sixes that share their core with the ubiquitous Cummins B-series found in pickups, agricultural tractors, and light industrial gear. These smaller engines drive recreational craft, small fishing boats, pilot boats, patrol craft, and the auxiliary power on larger vessels. Their volume is far higher than the K-series, and they carry the same dealer-coverage advantage down into the small-craft market where buyers value parts availability over peak specific output.

The mid-bore engines also matter for the genset business. A high-speed diesel turning at 1,500 or 1,800 revolutions per minute, coupled to an alternator, is the standard marine auxiliary and emergency power source on most commercial vessels. The QSB, QSL, and QSM11 in genset trim compete in exactly the same space covered in marine auxiliary engines and generators and pair with the high-speed emergency genset calculator on this site.

The B-series core under the QSB is worth its own note, because it is one of the highest-volume diesel engines ever built. The same basic 5.9- and 6.7-liter six powers Ram heavy-duty pickups, agricultural tractors, light industrial machines, and small marine craft. That volume drives the cost of parts down and the depth of field experience up, which is the whole argument for buying a truck-derived marine engine over a clean-sheet design. The trade is peak specific output and noise: a marinized truck engine isn’t as power-dense or as quiet as a purpose-built planing-craft engine, which is why the leisure and fast-ferry market splits its loyalty between Cummins and makers like Volvo Penta that tune harder for that duty.

There is a clear ladder through the mid-bore range. The QSB covers the smallest commercial and recreational craft, the QSC8.3 and QSL9 step up into pilot boats and small fishing vessels, and the QSM11 tops the mid-bore band before the K-series takes over. Each step adds displacement and continuous-duty capability rather than just peak power, which matches the way a commercial buyer moves up: from a craft that runs a few hundred hours a year to one that runs thousands.

Marine genset and auxiliary business

Cummins Power Generation is a large part of the wider company, and the marine genset line draws directly on it. Onboard a ship the auxiliary engines run the electrical load: lighting, pumps, navigation and communication equipment, cargo handling, and the hotel load on passenger vessels. An emergency generator, sized and certified to start and carry the safety load within the time limits set by class and SOLAS, sits separate from the main auxiliaries.

Cummins markets marine gensets across the small-craft and commercial bands, from a few tens of kilowatts on yachts and fishing boats up to engines of several hundred kilowatts paired with marine alternators for larger commercial ships. The same QSB, QSL, QSC, and QSM11 cores serve both propulsion and generation, which keeps the parts catalog tight and lets a single dealer support an operator’s whole engine room. For naval and government craft the genset line extends into ruggedized and shock-rated variants.

The fuel side of the genset math is where the company competes on running cost. Specific fuel consumption at the rated load point, brake thermal efficiency, and the resulting carbon dioxide per kilowatt-hour are the numbers an operator weighs against the purchase price.

A genset that holds a lower specific fuel consumption across the partial-load band, where auxiliaries spend most of their hours, saves fuel that compounds over thousands of running hours. Air inlet temperature affects that figure, and the sensitivity is real enough that ratings are quoted against reference ambient conditions.

Tier III and IMO NOx compliance

Marine high-speed diesels are regulated for nitrogen oxide emissions under MARPOL Annex VI Regulation 13, administered through the IMO NOx Technical Code, and in US waters under EPA marine engine standards. The IMO tiers tighten by engine build date and operating area. Tier I applied to engines built from 1 January 2000, Tier II to engines built from 1 January 2011, and Tier III to engines built from 1 January 2016 that operate inside a designated Emission Control Area. The North American ECA and the US Caribbean ECA are the principal Tier III zones for North American operators, with the North Sea and Baltic ECAs adding NOx control from 1 January 2021 for new builds.

The Tier III NOx limit is roughly 80 percent below Tier I, a cut a high-speed diesel can’t make through combustion tuning alone. Cummins meets it the same way most of the high-speed segment does, with selective catalytic reduction. SCR doses a urea solution into the exhaust, where ammonia reacts with nitrogen oxides over a catalyst to form nitrogen and water. The principle is the same one applied in SCR retrofits on two-stroke engines, though the high-speed installation is more compact and the dosing control is integrated with the engine’s electronic management. The broader regulatory picture for the larger ships sits in Tier III compliant two-stroke engines.

Cummins offers Tier III SCR aftertreatment as part of the engine package on the QSK range, certified to the relevant IMO tier and, where required, the EPA marine tier. The advantage of full-authority electronic control is that the engine and the aftertreatment dosing are managed together, which holds NOx conversion stable across the load range without the operator hand-tuning anything. Outside an ECA the engine reverts to its Tier II calibration, since the more aggressive Tier III package costs fuel and urea that aren’t needed in unregulated waters.

The carbon dioxide side of the emissions ledger is set by fuel burned, not by aftertreatment. Every kilogram of marine distillate burned releases a fixed mass of carbon dioxide, so the only way to cut it on a conventional diesel is to burn less fuel or switch to a lower-carbon fuel.

This is the link between the engine specification and the ship-level efficiency rules. The same carbon-per-energy logic feeds the design and operational indices, including the Energy Efficiency Existing Ship Index that now applies to the larger vessels above the high-speed band.

There is a practical wrinkle in how SCR interacts with a high-speed engine’s duty cycle. The catalyst needs a minimum exhaust temperature, often above 250 degrees Celsius, to dose urea and convert NOx efficiently. A high-speed marine engine that idles or runs at low load for long stretches, common in harbor maneuvering and standby duty, may not hold that temperature, so the dosing has to be managed around it. Cummins handles this through the electronic control that times the dosing and, where needed, manages engine load to keep the catalyst in its working window. This is one of the cases where full-authority electronics earn their cost: a purely mechanical engine couldn’t coordinate combustion and aftertreatment this way.

The urea logistics also affect operating cost. Tier III SCR consumes a urea solution, typically marine-grade aqueous urea, at a few percent of fuel volume, which the operator has to carry, store, and refill. For a vessel that spends most of its time inside an Emission Control Area the urea tank and refill schedule become part of the operating plan, while a vessel that only transits an ECA occasionally carries the SCR mostly as dormant weight. This is why the rating sheets distinguish the in-ECA Tier III calibration from the open-water Tier II calibration: the operator is buying flexibility, not a single fixed mode.

The fuel and speed relationship

For a propeller-driven vessel the power demand rises steeply with speed, close to the cube of speed across the displacement range, and fuel burn tracks that power. This is why a workboat operator picks an engine rating against a realistic service speed rather than the top of the power curve. A QSK60 sized for a sustained transit speed will spend its life near its continuous rating, while the same engine in a faster planing hull might rarely touch full power.

The cube-law relationship is the single most useful tool for matching a Cummins rating to a hull. It explains why a small reduction in service speed cuts fuel sharply, and why the tiered rating structure exists: the continuous rating suits the slow, hard-working displacement craft, and the high-output rating suits the fast, lightly loaded planing craft that draw peak power only in short bursts.

Decarbonization: Destination Zero and Accelera

Cummins set its decarbonization direction under the name Destination Zero, announced in 2022, with a stated goal of net-zero emissions by 2050 and interim 2030 targets across products and operations. The strategy runs on two tracks at once: cutting emissions from the existing diesel and natural-gas engine lines while building zero-emission powertrains in parallel, rather than betting the company on a single future fuel.

On the engine side, the centerpiece is the fuel-agnostic platform: a common base engine architecture below the head that can be built in diesel, natural-gas, and hydrogen-combustion versions sharing most parts. The idea is to let a customer pick the fuel for the duty without redesigning the whole engine. This started in the on-highway and industrial lines and feeds into the marine and off-highway ranges over time. Cummins also supports hydrotreated vegetable oil, a renewable diesel that drops into existing engines without hardware changes, across much of its current range, which gives operators a carbon cut without new capital.

The zero-emission products sit under Accelera by Cummins, the brand created in 2023 for what was previously the New Power business unit. Accelera covers battery systems, electric powertrains, fuel-cell systems, and electrolyzers for hydrogen production. In marine terms this points toward hybrid and battery-electric power for harbor craft, ferries on fixed routes, and other vessels with predictable duty cycles and shore charging, while the combustion engines carry the long-range and high-power duty that batteries can’t yet serve.

The honest position is that the marine high-speed diesel isn’t going away soon. Battery and fuel-cell power suit short, scheduled, low-power routes; a deep-sea supply vessel or a long-haul towboat still needs the energy density of liquid fuel. Cummins’s bet is to hold the diesel and gas business while it sells the zero-emission pieces into the niches where they work today, and to keep the fuel-agnostic architecture ready for hydrogen combustion as that fuel’s supply chain develops.

Renewable diesel is the part of this story that affects the existing fleet today rather than the new-build fleet tomorrow. Hydrotreated vegetable oil is chemically close enough to fossil diesel that it runs in current engines without hardware changes, and Cummins has approved it across much of its range. The carbon benefit comes from the feedstock, not the engine, so an operator can cut lifecycle carbon on an engine already installed, subject to fuel availability and price. That makes HVO the lowest-friction decarbonization step for a working high-speed fleet, and it is a step Cummins can sell without the operator buying a new engine at all.

The fuel-agnostic platform is the harder, slower bet. Sharing a base architecture across diesel, natural gas, and hydrogen combustion means the head, the fuel system, and the controls differ while the block, crankshaft, and most of the running gear stay common. The payoff is manufacturing scale and a shorter path to a hydrogen-combustion marine engine when the fuel is available at the dock. The risk is that hydrogen bunkering for marine use is years from broad availability, so the platform has to earn its keep on diesel and gas in the meantime. Cummins’s structure, holding both the combustion engines and the Accelera zero-emission products, lets it sell across whichever technology a given vessel’s duty and route actually support.

Application segments and where Cummins wins

The high-speed marine market splits into segments with different buying logic, and Cummins’s position varies by segment. Understanding which segment a vessel falls into explains why the same maker can dominate one part of the market and trail in another.

Inland waterway towboats and barges are the segment Cummins has held longest in North America. These are continuous-duty displacement craft that push tows up and down the Mississippi, Ohio, and other river systems for thousands of hours a year. The buying logic is uptime and rebuildability: an engine that strands a tow costs the operator far more than the fuel difference between makers. The K-series and QSK engines suit this duty because they are built to be rebuilt in place, and the dealer coverage along the river system means a failed engine gets serviced fast. This is Cummins’s home ground.

Commercial fishing is the other long-held segment, covering everything from small day boats to large factory trawlers. Reliability in remote operation matters more here than peak output, because a boat days from port can’t get a part overnight. The mid-bore QSC, QSL, and QSM11 engines and the smaller K-series cover most of this fleet, and the same dealer network that serves trucking ports serves fishing ports. Offshore supply and crew-transfer vessels are a related segment, more demanding on continuous power and increasingly on emissions, where the QSK60 and QSK95 compete against Caterpillar and MTU.

Workboats, tugs, ferries, and pilot boats fill the middle of the range. Tugs need high bollard pull, which means high continuous torque, and the QSK range delivers it. Short-route ferries are the segment most open to hybrid and battery power, which is where Accelera’s products start to compete against the company’s own diesels. Leisure and fast commercial craft, the planing-hull segment, is where Cummins competes hardest against Volvo Penta and MTU, and where peak specific output and refinement matter more than rebuildability.

Naval and government work

Cummins supplies engines to naval and government operators across propulsion and onboard power, though it doesn’t hold the dominant naval position that MTU does. Government craft, patrol boats, coast-guard vessels, and naval auxiliaries run Cummins power where the duty matches the commercial range, and the company offers ruggedized and shock-qualified variants for combatant applications. The genset side extends into shock-rated power for naval vessels, where the requirement to keep generating after a hull shock event drives a different design standard than commercial duty.

The naval segment is one of the clearest cases for the strategic logic of the Rolls-Royce Power Systems acquisition. MTU’s Series 4000 is the reference engine in a large share of the world’s fast patrol and combatant craft, a position built over decades of naval references that Cummins has never matched on its own engines. Folding MTU into Cummins would bring those naval references inside the combined company without Cummins having to displace MTU vessel by vessel, which is slow and rarely succeeds against an incumbent with that depth of fleet history.

Dealer and aftersales network

Cummins operates one of the largest distribution and service networks of any engine maker, with thousands of company-owned and independent distributor and dealer locations worldwide. The marine business rides on that footprint. An operator with a Cummins-powered fleet can get parts and trained service across most commercial ports and inland waterway hubs, and the same network supports the operator’s trucks, gensets, and off-highway equipment if those run Cummins power too.

This is the structural reason Cummins holds its inland-waterway and commercial-fishing positions. The high-speed marine buyer is rarely buying on peak specific output; they’re buying uptime, and uptime is a function of how fast a failed engine gets back to work. A dense dealer network with local parts stock and certified technicians is worth more to a working operator than a few grams per kilowatt-hour of fuel saving. The aftersales business also carries higher margins than the engine sale itself, which is why every serious high-speed maker invests in coverage.

Competitive position

The high-speed marine segment is more fragmented than the two-stroke main-engine market, where MAN Energy Solutions and WinGD hold a duopoly. In high-speed, the principal makers are Cummins, Caterpillar, MTU under Rolls-Royce Power Systems, Volvo Penta, Scania, Yanmar, and Mitsubishi, with each holding strengths in particular bands and applications. The wider roster is mapped in marine engine makers.

Against Caterpillar, the closest competitor, Cummins matches the breadth of range and the dealer-coverage model almost point for point. Caterpillar holds an edge in the largest high-speed bores through the C175 and in medium-speed through the MaK line it bought in 1997, while Cummins competes on the QSK range and on the truck-derived parts commonality. Against MTU, Cummins has historically ceded the premium naval and megayacht references, where the Series 4000 dominates, while holding the working-fleet and inland-waterway volume. The pending RRPS acquisition would change that calculus by bringing the MTU references inside Cummins.

Volvo Penta and Scania compete in the smaller and mid bands, with Volvo Penta strong in the integrated propulsion package for leisure and light-commercial craft and Scania strong in the workboat market on the strength of its truck-engine commonality, the same logic Cummins uses. Yanmar and Mitsubishi hold strong positions in Asian commercial fishing and coastal craft. Cummins competes across the broadest part of this map because its range, from the QSB up to the QSK95, spans more output bands than any single rival except Caterpillar.

Pending Rolls-Royce Power Systems acquisition

In late 2024 Cummins announced an agreement to acquire Rolls-Royce Power Systems from Rolls-Royce plc. RRPS is the parent of MTU Friedrichshafen and the global MTU brand, covering the Series 4000, Series 2000, Series 1600, and Series 1000 high-speed engines plus the MTU Onsite Energy stationary line. The deal is subject to regulatory approval in the European Union, the United States, and other jurisdictions, and was expected to close in 2026.

The combined entity would hold the broadest high-speed marine and industrial diesel portfolio in the world, with strong positions across US inland waterway, marine workboat and fishing, naval high-speed, megayacht propulsion, locomotive and rail, mining equipment, and stationary standby and prime power. The strategic logic is to join Cummins’s global service network and inland-waterway volume with MTU’s premium naval and megayacht references. Brand and product-line decisions for the combined entity were not finalized when the deal was announced, and any overlap between the QSK range and the MTU Series 4000 in the upper high-speed band is the obvious question the integration has to settle.

Manufacturing footprint

Cummins marine engines are produced principally at Seymour, Indiana, the main QSK plant and home of the dedicated QSK95 line, with corporate headquarters and the principal engineering center at Columbus, Indiana. European engine assembly runs through Daventry in the United Kingdom, with Chinese-market production through the company’s ventures in China and smaller-engine output supported through Pune in India and other venture plants. The component businesses for turbochargers, filtration, fuel systems, and emission solutions sit inside the wider Cummins group, which keeps the high-margin parts of the engine inside the company rather than bought in.

Limitations

The output bands quoted here are approximate and span the rating tiers a single engine model carries; the exact continuous, intermediate, and high-output figures for a given QSK or QSM application come from the current Cummins marine data sheet for that model and rating, not from this overview. Marine engine ratings are revised as emission packages and certifications change, so a figure correct for one model year may not hold for the next.

The acquisition of Rolls-Royce Power Systems was an announced agreement subject to regulatory clearance at the time of writing; the closing date, the final brand structure, and any product-line consolidation are matters for the completed transaction, not this article. Decarbonization product timing under Destination Zero and Accelera is set by Cummins’s own roadmap and by fuel-supply and infrastructure development outside the company’s control, so the marine availability of hydrogen-combustion or fuel-cell variants follows those external constraints.

This article is a corporate and product overview, not an engineering specification or a compliance document. Selection of an engine and its emission package for a specific vessel, route, and flag state requires the current manufacturer data, the applicable IMO NOx tier and EPA marine standard for the build date and operating area, and class-society approval. Use the manufacturer’s documentation and the relevant regulatory text for any design, purchase, or compliance decision.

See also

• Cummins QSK Series: High-Speed Marine Engine
• Caterpillar Marine: Corporate History
• Rolls-Royce Power Systems and MTU Corporate History
• Volvo Penta 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
• What Is EEXI
• Marine Engine Makers

Related calculators:

• Cummins Marine QSM-11: MCR per Cylinder
• Cummins Marine QSK60-M: MCR per Cylinder
• Cummins Marine QSK38: MCR per Cylinder
• Cummins Marine QSK19: MCR per Cylinder
• Emergency Genset: High-Speed Diesel
• Marine Engine Model Decoder