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Enviro-Design® Dual-Fuel Engine Technology

In the early 1990s, Fairbanks Morse Engine introduced revolutionary dual-fuel combustion technology that reduced NOx exhaust emissions to levels previously achievable with only lean-burn spark-ignited gas engines. When equipped with Enviro-Design® technology, Fairbanks Morse engines utilize pre-combustion chambers to reduce the quantity of pilot diesel fuel required for ignition.

Available with the Opposed Piston, FM-MAN 32/40 DF, and the Colt-Pielstick PC2.5/6, Enviro-Design technology makes these engines the most efficient low-emission offering in their respective size range.


Benefits of dual-fuel engines equipped with Enviro-Design technology:

  • Nominal 1% Pilot Fuel Requirement - Enviro-Design engines require a smaller amount of pilot diesel fuel for ignition than competitive engines. This equates to lower fuel costs and storage requirements and inherently lower NOx exhaust emissions.
  • Reliability and Availability - Enviro-Design engines achieve ignition without the need for spark plugs, thus reducing costly downtime associated with plug-related maintenance.
  • Fuel Flexibility - Enviro-Design engines can burn various grades of digester gas as well as pipeline-quality natural gas, at pressures below 100 psig. Diesel fuel operation is always available in the event of an interruption of gaseous fuel supply.
  • Higher Output and Efficiency - Each Enviro-Design engine is supplied with state-of-the-art electronic combustion controls to maximize efficiency and performance.
Opposed Piston cylinder liner
Shown (left) is the Opposed Piston cylinder liner with Enviro-Design® fuel injection and gas valve components installed. A small quantity of pilot diesel oil is admitted into the pre-combustion chamber for ignition into the main chamber during the compression stroke. The 12 cylinder O-P engine utilizes only 2.9 gallons per hour (approximately 11.0 liters per hour) at 100% rated load.