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The G20CM34 is a spark ignited engine operating according to the lean burn combustion system. The use of a pre-chamber operated by means of a spark plug enables a combustion at high efficiency and low emissions. The cylinder-pressure based engine management of the G20CM34 enables engine operation at the efficiency optimum. The single-stage turbocharged, charge air cooled 20 cylinder engine reaches an electrical efficiency of up to 48 % and an overall efficiency of up to 93 %. Two charge air coolers allow a maximum utilization of the available displacement. A two-circuit cooling water system ensures flexibility. With a high temperature (HT) and a low temperature (LT) stage each, individual configurations for high altitudes of installation, high intake air temperatures, and natural gases with varying methane numbers are available. Depending on the requirements, these configurations can be optimized for purely electric power generation and combined heat and power. Stable engine operation at varying natural gas qualities is ensured by means of cylinder-specific knocking detection and continuous NOx control. An optimum material design (as e.g. the flow-optimized gas supply in the cylinder head) ensures a long service life of the components. Low fuel and lubricating oil consumption as well as low maintenance effort cater for high availability and cost efficiency of the engine.

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  • Maximum Continuous Rating 9830 / 10300 ekW @ 0.8 pf
  • Fuel Type Natural Gas
  • Maximum Electrical Efficiency 48.9%
  • Frequency 50 / 60 Hz

Call 440-838-7348 for rate information

Generator Set Specifications

  • Maximum Continuous Rating
    9830 / 10300 ekW @ 0.8 pf
  • Fuel Type
    Natural Gas
  • Maximum Electrical Efficiency
  • Frequency
    50 / 60 Hz
  • RPM
  • Frequency
    50/60 Hz

Engine Specifications

  • Engine Model
  • Displacement
    46484.2 in³
  • Aspiration
    Turbocharged and Aftercooled
  • Bore
    13.38 in
  • Stroke
    16.53 in

Generator Set Dimensions

  • Length
    562.2 in
  • Width
    153.9 in
  • Height
    212.2 in
  • Dry Weight - Genset
    361559 lb

Genset Details

  • Spark ignited lean burn natural gas engine
  • Electric power output with 10300 / 9830 ekW at 50 / 60 Hz application
  • Medium-speed engine concept with high efficiency up to 48.9 %
  • Designed for open cycle, base- and peak load as well as CHP application
  • Wide operating ranges with excellent load following capability and high part load efficiency
  • Compliance with World Bank Emission Certificate according to IFC-2008 without additional exhaust gas aftertreatment
  • Compliance with MCPD 2015/2193/EU, IED according to 2010/75/EU, and 13th and 44th BImSchV by using SCR and oxidation catalyst

Fuel Flexibility

  • Capability for operation with various gas qualities
  • Variable configuration for natural gas with diverse methan number


  • Withstand the most challenging conditions and is thus offering a wide range of applications
  • Maximized benefits thanks to individual, tailor-made adjustments and extensions
  • Project-specific adjustment to fulfill challenging ambient conditions like high altitude and / or high temperature

Modular scope of supply

  • The Caterpillar Standard Scope of Supply ensures maximum safety, best performance and excellent service capability for your Power Plant with our Gensets. Operational reliability creates a safe working environment for your employees based on our knowledge and experience, combined with the high quality of the selected components. We enable lowest fuel consumption due to an outstanding engine design as well as highest uptime through reliable power output. If you choose the Caterpillar standard scope of supply, our experienced team is capable to support you immediately remote and on site. With our Caterpillar optional scope, you can also get a wide range of auxiliaries for your power plant, convenient and fully compatible

Gas Valve Unit

  • The GVU is a stand-alone auxiliary and regulates the gas supply under all required conditions for engine operation. It is designed for natural gas operation and is therefore equipped with special safety devices. Within the GVU, the incoming natural gas is separated into ignition and main gas. Special sensors and valves enable the pressure and leakage detection to shut-off both lines. The equipment of the gas valve unit shown in the picture above is the variant according to European standard.

Cooling water and lube oil combined module

  • The combined module includes the main components of the cooling water system and the lube oil system and is located in the power house. It provides the engine with a sufficient amount of cooling water and conditioned lube oil. The selection of the appropriate module is made by Caterpillar Motoren GmbH & Co. KG. To prevent contamination from expanding, each engine is equipped with its own combined module.

World Wide Product Support

  • Training Center: Get the most out of your engine while we are focusing on your individual requirements. We provide a customized engine training for customer and dealer personnel which will help you to get a competent knowledge about the engine, its components and maintenance procedures.
  • The Engine Training Center is located at the Caterpillar Motoren facility in Kiel – modernized and reopened in 2011. The training classes are conducted for up to eight customers, so you have the best efficiency in learning. Several classrooms and all current engine types and technologies are available – for both theoretical as well as hands-on training.
  • REParts Center: In addition to the traditional spare parts business, we also offer a broad portfolio of value-added after-sales services, including the reconditioning of wear parts. This enables you to operate your equipment even more efficiently.
  • Rebuilding MaK genuine parts enables a second life, adding value to your investment and reducing overall owning and operating costs. Through our new MaK Repair and Exchange Parts program, we are able to offer our customers extensive repair and exchange options, which provide same-as-new performance and reliability at a fraction of new price. The results are maximum engine productivity and lower life cycle costs –while reducing the impact on the environment.

Standard Equipment:

  • Safety
    • Crankcase ventilation
    • Oil mist detector
  • Fuel System
    • Gas valve unit (GVU)
  • Combined Module
    • Cooling water- and lubricating oil system partly on a common base frame with standardized pipe interface. (Cooling water system requires additional cooling towers, radiators or similar)
  • Intake Air
    • Systems that can be adjusted to suit the ambient conditions are available, such as pocket filters, oil bath filters or pulse filters
  • Starting Air
    • Starting air compressor module
    • Starting air receiver module
  • Exhaust Gas
    • Exhaust gas ventilation module
    • Exhaust gas silencer
    • Further elements, such as SCR and oxidation catalyst, are available as options
  • Control & Monitoring System
    • Provides the control, monitoring and protection functions of the engine, generator and engine support modules through:
      • Local Control Panel (LCP) (recommended) or
      • Local Data Panel (LDP) and Generator Control Panel (GCP)
    • Provides the control of the engine support modules through Motor Control Center (MCC)
    • Asset Intelligence System: Your remote diagnostic system, worldwide
  • Vibration Damping
    • Optimum oscillation and vibration damping systems for safe and operationally reliable set-up of the plant, especially adjusted to suit your ambient conditions.
    • Engine and generator can be supplied as a unit on a common base frame

Optional Equipment:

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