What is a key difference between the 737-800 and the MAX engines?

The statement highlighting the MAX's larger engines with a bypass ratio of 9:1 accurately reflects a significant difference between the 737-800 and the 737 MAX. The engines on the 737 MAX, specifically the LEAP-1B engines, indeed feature a higher bypass ratio compared to the engines on the 737-800, which typically have a bypass ratio closer to 5:1. A higher bypass ratio generally means that a greater proportion of the thrust is produced by the bypassed air (not passing through the engine core), leading to increased efficiency and reduced noise levels.

Larger engines with a higher bypass ratio contribute to improvements in fuel efficiency and overall performance in various flight conditions, aligning with modern aviation preferences for sustainable operations. This allows the MAX to offer better range and fuel savings compared to its predecessor, the 737-800.

The other aspects regarding thrust capacity or the use of the same engine model do not reflect the advancements and modifications that characterize the transition from 737-800 to the MAX series.