Relatively easy to fit a smaller diameter engine into the space in which a
larger one fit. The retrofit of the 110 engine into the F-14's engine bays
(TF-30's somewhat physically larger than a J-79 BTW) was a real squeeze.

Compressor inlet temp can be handled by water injection (Skyburner F-4 had
it, Greenameyer's F-104 was getting it). Canopy overheating is another
problem.

R / John

"Bjørnar Bolsøy" wrote in message
...

http://www.f-16.net/reference/versions/f16_79.html

I've read that the F-104's speed is really limited by the
compressor inlet temperature on the J79, and that the
airframe itself supports much higher speeds. Since the
J79 fits (modified) in a F-16, what then if we were to
fit a GE-F110 type engine with closer to twice the thrust?



Regards...