What is the greatest pressure ratio generated by the multiple fan stages of a low bypass turbofan engine?

Answer 1

I don't know that anybody actually maintains this exact statistic. Substantial pressure ratio increases isn't always desirable because it increases the likelihood of an engine stall which can severely damage or destroy a large turbine engine. If you went onto the websites of Rolls Royce, GE, and Pratt & Whitney, you can take a look at the different models of engines that each manufacture and if this information is given, you can compare it with all the others.

Answer 2

Contact GE Aircraft Engines or Rolls Royce Aviation.