PW4000-94 and CF6-80C2 Comparison
Well the CF6 ended up being the most powerful of those level of engines and it also is louder than the PW4000-94 which makes sense. The most powerful engine in this case is simply the biggest one. The CF6 basically began as the CF6 and got changed here and there every time there was the need. The PW4000 as an evolution of the JT9D so its ...