The GEnx Commercial Aircraft Engine

The GEnx engine delivers proven performance for the Boeing 787 Dreamliner and Boeing 747-8.

The GEnx is the fastest-selling, high-thrust jet engine in GE Aviation history with more than 2,700-plus engines in-service and on order. GEnx is the best-selling engine on the 787 Dreamliner in addition to powering the four-engine Boeing 747-8.

Based on proven GE90 architecture, the GEnx engine offers up to 15% improved fuel efficiency and 15% less CO2 compared to GE’s CF6 engine. The GEnx engine represents a giant leap forward in propulsion technology, using the latest materials and design processes to reduce weight, improve performance and deliver a more fuel-efficient commercial aircraft engine.

Key to GEnx engine's performance are its high pressure compressor, lean-burning combustor and lightweight durable composite materials, including the world’s first composite fan case and fan blades for commercial aircraft.

With the highest pressure ratio compressor in commercial service today, the GEnx has the best fuel efficiency in its thrust class, enabling it to power many of the longest routes. These leading-edge technologies and the engine's elegant architecture bring in high operational reliability, excellent utilization rate and route flexibility for more flights per year and more revenue for airlines.

Carbon-fiber composite fan blades

After introducing composite fan blades on the GE90 engine in 1995, GE Aviation is taking the technology to a new level with the GEnx. The carbon-fiber composite fan blades on the GEnx engine feature a new, more efficient design, a reduced blade count (from 22 to 18 fan blades) and a composite fan case for further weight reduction.

Advanced low-pressure turbine (LPT)

The GEnx low-pressure turbine (LPT) is lighter and more efficient than its predecessor and incorporates next-generation 3D aerodynamics. It also introduces Titanium Aluminide blades to stages 6 and 7, reducing engine weight by approximately 400 lbs. and contributing to increased fuel efficiency on the GEnx engine.

GEnx Engine Models

GEnx News

GEnx-1B Engine

Designed specifically for the Boeing 787 Dreamliner family, the GEnx-1B engine delivers up to 15% better specific fuel consumption than its predecessor, a 2% fuel burn advantage over its competition and a 1% advantage with respect to fuel burn retention.

GEnx-2B Engine

Optimized for the Boeing 747-8 airplane, the GEnx-2B engine features a smaller fan, de-staged booster and de-staged low-pressure turbine. The GEnx-2B contains an identical core and similar materials as the GEnx-1B to provide synergies for mixed GEnx fleets.

GEnx Engine Model Comparison
(787-8) -1B74/75
(787-9) -1B76
(787-10) -2B67B
Takeoff thrust 69,800 74,100 76,100 66,500
Bypass ratio (takeoff / top-of-climb) 9.0 / 8.3 8.8 / 8.1 8.8/ 7.9 8.0/7.4
Overall pressure ratio (takeoff / top-of-climb) 43.8 / 53.3 46.3 / 55.4 47.4 / 58.1 44.7 / 52.4
Air Mass Flow (takeoff, lbs-mass/sec) 2559 2624 2658 2297
Fan Diameter (in) 111.1" 111.1" 111.1" 104.7”
Base Engine Length (in)* 184.7 184.7 184.7 169.7
Compressor Stages (Fan/Booster/HPC) 1/4/10 1/4/10 1/4/10 1/3/10
Turbine Stages (HP/LP) 2/7 2/7 2/7 2/6
Bearings 2B+4R 2B+4R 2B+4R 2B+4R