Marine Diesel Engines and Generators

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Nanni Marine Diesel Engine N4.50

47.5 hp

Kubota engine base

This Nanni Diesel 4 cylinder marine engine which incorporates the latest Kubota innovations, is particularly well suited for displacement vessels and sailing yachts.


Nanni Diesel has forged a strong partnership with Kubota. Kubota engines are known for their robust design and ensure great reliability and excellent longevity. Experience and know-how of the Nanni Diesel engineers resulted in the latest marinization developments which benefit the N4.40. The heat exchanger ensures an ideal temperature management of the engine even during heavy duty operation. Reliability and low maintenance cost are warranted by the timing gear and other solid designs of the robust Kubota engine base.

Environmental-Tri Vortex Combustion System (E-TVCS)

The N4.50 is equipped with the E-TVCS combustion and injection system which considerably reduces particulate emission and smoke while dramatically improving fuel efficiency.

Comfort of use

Its low rated speed of 2800 rpm coupled with powerful cylinder capacity gives the N4.50 ample power for all navigation conditions. A special coating of the pistons with molybdenum lowers friction and reduces engine vibrations resulting in supplementary comfort concerning the sound levels. The large choice of straight or angle down gearboxes, either mechanical or hydraulic, as well as a Sail Drive transmission allows you to fully utilize the significant torque of this engine by perfectly adapting it to your specific vessel.

Protecting the environment

The N4.50 complies with the most stringent emission regulations in the world: EU-RCD, US-EPA, BSO

Technical Specifications

  • Engine Base: Kubota
  • Rated Power (kW/HP): 36.8 / 47.5
  • Rated RPM: 2800
  • Displacement (cm³/in³): 2197 / 134
  • Number of Cyliners: 4 in line
  • Bore and Stroke (mm/in): 87 x 92.4 / 3.43 x 3.64
  • Compression Ratio: 22:1
  • Intake: Naturally Aspirated

Engine Specifications

  • Dry Weight with Transmission (kg/lb): 230 / 507
  • Maximum Install Angle: 15° (dynamic)
  • Exhaust Hose Diameter (mm/in): 60 / 1.57
  • Fuel Hose Diameter (mm/in): 8 / 0.31
  • Sea Water Hose Diameter (mm/in): 32 / 1.25
  • Transmission: Mechanical Shaft
  • Cooling: Closed with Heat Exchanger
  • Certifications: EPA, BSO, SAV, EU-RCD

Standard Equipment

  • Fresh Water Cooled Exhaust Manifold
  • Exhaust Elbow
  • 4m Electrical Extension Harness
  • Fuel Filter
  • Oil Filter
  • Mecanical Gearbox
  • Sea Water Pump

Optional Equipment

  • Keel Cooling Adaptation
  • Complete Propulsion Kit
  • Thottle and Shift Controls
  • Flybridge Panel and Extension Harness
  • Bi-Pole Electrical System
  • Water Boiler System
  • Complete Fuel System
  • Complete Exhaust System