Originally Posted by
Bucking Bar
FTB,
The GTF technology is being scaled up, not down. There is talk of using it on a re-engined 757.
Just learned from Wiki that the CF-34-10 has a core from a CFM-56 (737 engine). Who knew the largest RJ's now have the same engine as the Airbus and Boeing products. There sure are a lot of 20K engines out there.
A geared turbofan on the 757 would be very expensive and require a lot of engineering and almost certainly a entirely new center wing box much like the A320. I would be very surprised if any aftermarket companies took on that kind of expense. Just getting the A320 reengined is taking Airbus almost 5 years in work. The overall cost on each airframe would probably be way beyond any potential fuel savings.