Re: In this case, it's not the technology.
Everyone is missing the fact that the engines have been re-furbished by AeroJet. So the misconception that they came out of a 40 year old factory untouched isn't realistic.
Its a single shaft turbo pump so it drives fuel and oxidizer, the comentard that poked at my comment of an engine failure cant eat that as I called it as such.
The interesting thing is what are Orbital going to use for an replacement. They cant get engines from Energia as these are all contracted to RocketDyne/ULA. Maybe they can graft Cygnus to a 60 year old Soyuz :-)