Marine Diesel Engines and Generators

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NANNI N3.21 Marine Diesel Engine

21 HP

Kubota Engine Base

The latest technologies employed by Kubota resulted in a robust design for the N3.21. The industrial engine base is proven in even the most difficult conditions.

Reliability and Comfort

The NANNI N3.21 builds on its established reputation for reliability with new marinization enhancements. The latest generation heat exchanger improves temperature regulation, especially beneficial when a boiler is installed. This improved system further extends the N3.21’s lifespan and overall dependability. Additionally, special molybdenum-coated pistons minimise friction and reduce engine vibrations, resulting in quieter operation for enhanced onboard comfort.

Ease of Installation

Repowering your boat is a breeze! The N3.21 engine is designed to be incredibly versatile, offering multiple installation options suitable for a wide range of boats. Our specially designed installation kits ensure the N3.21 integrates seamlessly into your existing engine compartment, minimising hassle and saving you time.

Clean Power Supply

The NANNI N3.21 prioritises both environmental responsibility and performance. This engine achieves compliance with the latest emission regulations (EU-RCD, US-EPA, and BSO) without the need for electronic equipment.

The secret lies in the advanced E-TVCS (Environmental-Tri Vortex Combustion System). This innovative system significantly reduces particulate emissions and smoke, while achieving impressive improvements in fuel consumption. The N3.21 lets you enjoy cleaner operation without sacrificing power or efficiency.

Technical Specifications

  • Engine Base: Kubota
  • Rated Power (kW/HP): 15.4 / 21
  • Rated RPM: 3600
  • Displacement (cm³/in³): 719 / 46.86
  • Number of Cyliners: 3 in line
  • Bore and Stroke (mm/in): 67 x 68 / 2.64 x 2.68
  • Compression Ratio: 23:1
  • Intake: Naturally Aspirated

Engine Specifications

  • Dry Weight with Transmission (kg/lb): 106 / 233
  • Maximum Install Angle: 15° (dynamic)
  • Exhaust Hose Diameter (mm/in): 40 / 1.57
  • Fuel Hose Diameter (mm/in): 8 / 0.31
  • Sea Water Hose Diameter (mm/in): 20 / 0.79
  • 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