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12 4V 21

1500 HP 2800 rpm

A fully mechanical 12-cylinder engine delivering class-leading power-to-weight ratio in an exceptionally compact format

Developed from the proven architecture of the PLUS series 6-cylinder engines, it further enhances performance, efficiency, and mechanical reliability

Engineered for long-range patrol vessels and high-end pleasure craft, the V12 combines low fuel consumption with simplified maintenance and an extended TBO — making it a high-efficiency solution for demanding applications

Key Features at a Glance

Incredibly Compact Design

Width, Length and Height of only 1083mm, 1840mm and 1290mm

High Power-to-Weight Ratio

1500 HP with a light weight of 1850 kg resulting in a HP/kg of 0.81

High Reliability

Exeptional TBO and very long maintance schedules

MOD. 12 4V 21 - Technical Specifications

Configuration

No. of Cylinders

Bore / Stroke

Total Displacement

No. of Valves

Dry Weight

Max Output

Max torque

Max rpm

Fuel Consumption

Diesel Turbocharged 4 Stroke - Mechanical Injection

12 V 90°

127 / 135 mm

20.52 Litres

4 per cylinder

1850 Kg (4078 lbs)

1103 kW (1500 HP)

4600 Nm (2000 rpm)

2800 rpm

220 g/kWh (5,69 Ounce/HPh)

MOD. 12 4V 21 - Technical Specifications

The performance curve chart for the MOD. 12 4V 21 engine illustrates three key parameters plotted against Engine Speed (RPM):

Torque (Nm)

  • Starts around 4450 Nm at 1700 RPM
  • Peaks slightly above 4600 Nm at around 1900 RPM
  • Gradually decreases after the peak, dropping to about 3700 Nm at 2800 RPM

Power (Kw)

  • Starts at around 800kW at 1700 RPM
  • Increases steadily and plateaus around 1100kW between 2600–2800 RPM

Fuel Consumption(gr/kWh)

  • Begins high at about 220 gr/kWh at 1700 RPM
  • Decreases to a minimum (around 197gr/kWh) near 2100 RPM
  • Then it rises again towards 215 gr/kWh at 2800 RPM

This graph provides a comprehensive view of the engine’s operational efficiency across varying speeds, helping optimize performance and fuel economy.

Dimensions

View Dimensions
  • LDA Smoke limiting system
  • Dry Air filter with stainless steel net
  • Water cooled turbocharger
  • Electric system extension cable
  • Mechanic governor
  • 24V wiring loom, insulated pole, 120A alternator
  • Intercooler
  • Water cooled waste gate
  • Water cooled riser
  • Manual oil sump Instruments composed by panel (electronic)
  • SAE 1 flywheel housing
  • Water cooled exhaust manifold
  • redundancy analog gauge (tachometer, water temp, engine oil pressure)
  • Mounting block
  • Auxiliary pump (power steering)
  • Fuel water heat exchanger
  • Gearbox fitted on
  • Exhaust flexible sleeve

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