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High Performance Propulsion Engines

Industry-leading technology allows Caterpillar to create the most reliable commercial engines for a variety of applications. From tugs and container vessels to yachts and sport fishers, Cat and MaK engines have demonstrated their efficiency countless times. With remarkable reliability and durability, these engines will exceed your expectations for decades.

Cat C12.9 High Performance Propulsion Engine

The C12.9 marine propulsion engine is ideal for high performance marine applications including yachts, fishing vessels, military vessels, governmental vessels and various other commercial high performance marine applications. The C12.9 is designed to be integrated with both the Cat Three60 Precision Control shaft line maneuvering and engine control solution as well as other marine industry throttle controls. The electronically-controlled C12.9 is offered in two power ratings: 850 mhp at 2300 rpm and 1000 mhp at 2300 rpm. Both ratings meet EPA Tier 3, IMO II, EU Recreational Craft Directive and EU Stage IIIA regulations. In addition to high power density, the C12.9 offers high torque at low engine speeds and fast acceleration throughout the entire engine speed range due to its air system design of integrated series turbochargers and a supercharger.

  • Specification Summary

  • Power Range 850-1000 mhp, 838-985 bhp, 625-735 bkW
  • Speed Range 2300 rpm
  • Emissions EPA Tier 3, IMO II, EU Stage IIIA
  • Aspiration TA

Product Details


Power Range 850-1000 mhp, 838-985 bhp, 625-735 bkW


Speed Range 2300 rpm
Emissions EPA Tier 3, IMO II, EU Stage IIIA
Aspiration TA
Bore 135 mm
Stroke 150 mm
Displacement 12.9 l
Rotation from Flywheel End Counterclockwise
Configuration In-line 6, 4-Stroke-Cycle Diesel

Dimensions & Weights

Width - Engine 1110 mm
Length - Engine 1463 mm
Height - Engine 1085 mm
  • Electronically controlled supercharger
    • Series turbochargers with heat shield
      • Watercooled exhaust manifold
        • Dual aftercoolers
          • Closed crankcase ventilation system
            • Thermostats and housing
              • Gear-driven sea water pump with bronze impeller
                • Common rail fuel system
                  • Plate-type heat exchanger
                    • Engine oil cooler
                      • Engine-mounted fuel cooler
                        • Vibration damper and guard
                          • Grid heater
                            • Electric fuel priming pump
                              • Seawater pump outlet pressure sensor
                                • Water-in-fuel detection switch
                                  • Exhaust gas stack temperature sensor
                                    • Coolant level sensor
                                      • Alternators
                                        •  24V 120 amp
                                        •  24V 160 amp
                                        •  12V 200 amp
                                      • Transmission gear oil cooler
                                        • Transmission sensor packages for on- or-off-vessel monitoring
                                          • Instrument panel – MECP I
                                            • Electric starting motor
                                              •  12V
                                              •  24V
                                            • 12V
                                              • 24V

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