VETUS M-Line Inboard Marine Diesel Engines – 11.8–51 HP provide a choice of six compact marine propulsion engines for sailboats, motorboats, launches, and other displacement or semi-displacement vessels. The range includes the M2.13, M2.18, M3.29, M4.35, M4.45 and M4.56, allowing boat owners, builders and marine engineers to select an engine according to the vessel’s size, required output and propulsion arrangement. These are true inboard diesel engine models designed for installation inside the vessel and connection to a suitable marine gearbox, propeller shaft or compatible saildrive configuration.

The range begins with the two-cylinder M2.13 and M2.18, followed by the three-cylinder M3.29 and the four-cylinder M4.35, M4.45 and M4.56. Listed output options are 11.8 HP, 15.8 HP, 26.2 HP, 32.1 HP, 40.8 HP and 51 HP. VETUS may market these outputs in rounded figures as 12 HP, 16 HP, 27 HP, 33 HP, 42 HP and 52 HP. This selection makes it easier to choose a marine diesel engine for a compact sailing yacht, a repowering project or a larger leisure and commercial boat. The M-Line’s compact configuration is particularly useful where machinery-space dimensions and service access must be considered carefully.

VETUS describes its M-Line models as quiet, fuel-efficient marine engines with a strong power-to-torque ratio. A water-cooled aluminium top cover helps reduce radiated engine heat and operating noise, while the redesigned air-filter housing contributes to a quieter onboard environment. The engines use indirect cooling, separating the engine’s internal coolant circuit from the external raw-water circuit through a heat exchanger. This arrangement is commonly chosen for dependable inboard marine operation. The current range is also approved by VETUS for operation with HVO, subject to the manufacturer’s fuel requirements and operating instructions.

The six variants allow buyers to match cylinder configuration and power more closely to the vessel. The M2.13 and M2.18 are compact two-cylinder choices, the M3.29 provides a three-cylinder step between the smaller and larger models, and the M4.35, M4.45 and M4.56 offer four-cylinder power for applications requiring greater output. The M4.56 is the highest-output option and uses turbocharging. Depending on the selected model and order configuration, compatible gearbox or saildrive arrangements may be available. Final engine selection should consider vessel displacement, hull type, propeller calculation, engine-bed dimensions, transmission ratio, exhaust layout, cooling system, and electrical requirements.

Key Features:

• VETUS M-Line Inboard Marine Diesel Engines – 11.8–51 HP offer six power options for matching the propulsion system to different vessel sizes and operating requirements.
• Six available variants: M2.13 at 11.8 HP, M2.18 at 15.8 HP, M3.29 at 26.2 HP, M4.35 at 32.1 HP, M4.45 at 40.8 HP, and M4.56 at 51 HP.
• Two-, three- and four-cylinder configurations provide suitable choices for compact engine rooms and higher-output installations.
• Designed specifically as a VETUS diesel engine range for inboard marine propulsion.
• Water-cooled aluminium top-cover design helps limit radiated heat and engine noise.
• Redesigned air-filter housing supports quieter operation inside the vessel.
• Indirect cooling uses a closed internal coolant circuit and a heat exchanger for marine operation.
• The range is designed to provide a practical balance of power, torque, fuel efficiency and compact installation dimensions.
• M4.56 incorporates turbocharging for the highest output within this six-model range.
• Current M-Line engines are HVO approved according to VETUS, subject to the manufacturer’s specified fuel and operating requirements.
• Selected models may be ordered for conventional shaft-drive or compatible saildrive installations, depending on the required configuration.
• Suitable for new boat construction and replacement of an existing diesel engine for boat applications following professional installation assessment.

Applications / Suitable For:

• VETUS M-Line Inboard Marine Diesel Engines – 11.8–51 HP are suitable for sailboats, sailing yachts, motorboats, launches and other vessels requiring compact inboard propulsion.
• New vessel construction where the engine, transmission, shaft line, exhaust, and cooling systems can be planned together.
• Marine engine replacement or repowering projects where dimensions, engine mounts, gearbox ratio and propeller requirements have been professionally checked.
• Conventional propeller-shaft installations using an appropriately matched marine gearbox.
• Compatible saildrive installations when the correct saildrive-ready engine version and related components are selected.
• Leisure craft, working boats and other displacement or semi-displacement vessels within the output requirements of the available models.
• Boat owners searching for a compact marine engine, inboard diesel engine, or VETUS M-Line propulsion package.

FAQs:

Q: What variants are available for the VETUS M-Line Inboard Marine Diesel Engines – 11.8–51 HP?
A: The range includes the M2.13 at 11.8 HP, M2.18 at 15.8 HP, M3.29 at 26.2 HP, M4.35 at 32.1 HP, M4.45 at 40.8 HP, and M4.56 at 51 HP.

Q: Is this a diesel outboard motor?
A: No. These are inboard marine diesel engines installed inside the vessel. They should not be classified as diesel outboard motors.

Q: Can a VETUS M-Line engine replace an existing boat engine?
A: It may be suitable for repowering, but the engine dimensions, mounting points, transmission, propeller, exhaust, cooling, and electrical systems must be checked before selection.

Q: Are all six engines supplied with the same transmission?
A: Not necessarily. Gearbox and saildrive compatibility varies by model and order configuration, so the required propulsion package should be confirmed before purchase.