Gt1 From United States of America, joined Feb 2001, 133 posts, RR: 0 Reply 1, posted (12 years 5 months 3 weeks 4 days 11 hours ago) and read 1122 times:
They are different engine families. The PW2000 is in the 40,000 lb thrust class, while the PW4000 on the 744 or 767/MD11/A300/A310 (94 inch version) is in the 60,000 lb thrust class. Which is to say that the PW4000 is larger and more powerful than the 2000. There are many differences and some similarities in the 2 engines. But they are definitly different engines. In fact there are way too many differences to list, however to mention just two big ones, I would say gearbox location, and FADEC system. Just to make things interesting, the 100 inch (A330) and 112 inch (777) PW4000 are different also, even though Pratt's marketing department would never admit that.
As for why different engines for 2 apparently similarly sized aircraft, check the max takeoff weight.
Tupolev154B2 From United States of America, joined Jun 2000, 1332 posts, RR: 2 Reply 2, posted (12 years 5 months 3 weeks 4 days 2 hours ago) and read 1104 times:
Oh, OK. Were they both designed at the same time or did the PW 2000 come out earlier with the first 757's? Any reasons why the PW engines for the A330 and 777 are different? I thought that both aircraft are in the same class. Is the difference any larger than the difference(s) between the Trent 700 and the Trent 800?