Boeing 737 MAX vs Airbus A320neo: Engine Design Differences Revealed

The Boeing 737 MAX and Airbus A320neo may look similar, but they have distinct differences under their hoods. One key difference is in the engines used by each aircraft - the 737 MAX exclusively uses the LEAP-1B engine, while the A320neo offers two options: the LEAP-1A or Pratt & Whitney’s geared PW1100G.

The LEAP-1B engine is optimized for the 737 MAX's airframe, with a fan diameter of 69.4 inches and a bypass ratio of 9:1. In contrast, the A320neo uses either the LEAP-1A with an 78-inch fan and 11:1 bypass ratio or Pratt & Whitney’s geared PW1100G.

The differences in engine design reflect distinct aerodynamic and operational requirements for each aircraft. Airlines may think they can interchange engines between the two planes, but that's not possible due to their unique characteristics.