This is how the SpaceX Raptor engines have changed over the years
Here's some of the things that have improved:
Chamber pressure:
Raptor 1 (2019): ~250 bar
Raptor 2 (2022): ~300 bar
Raptor 3 (2024): ~350+ bar
Thrust:
Raptor 1: ~185 tf
Raptor 2: ~230 tf
Raptor 3: ~280 tf (target)
Reuse target:
Raptor 1: Limited testing
Raptor 2: High reuse target
Raptor 3: 100+ flights
(Photo Credit:
@JarsyInc)