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N3.21

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 the most difficult conditions of usage.

Reliability and Comfort

This engine has a proven reliability record and the new marinization has even added to its quality level. The latest generation heat exchanger improves the temperature regulation, which quality can particularly be appreciated when a boiler is installed. This system further increases the reliability and longevity of the N3.21. A special coating of the pistons with molybdenum lowers friction and reduces engine vibrations resulting in supplementary comfort concerning the sound levels.

Ease of Installation

The N3.21 offers several onboard installation options making it suitable for a vast variety of boats. Repowering your boat is a breeze with our installation kits which are specifically designed to eliminate the need to modify the frame of your existing engine compartment.

Clean Power Supply

The N3.21 does not need electronic equipment to comply with the latest environmental requirements on raw materials. The emission regulations EU-RCD, US-EPA and BSO are easily complied with as the result of the improved combustion and injection system E-TVCS (Environmental-Tri Vortex Combustion System). The particulate emission and smoke have been significantly reduced and the fuel consumption has been dramatically improved.

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