We have come across few cases where the tender Document itself is wrong. Some times MISTAKE(S)/ERROR(S) DO HAPPEN. We have to excercise our CAUTION/ALERTNESS.
1600cc of air pressure for what? Many times you can use assumptions to arrive at your answer. Like, assuming the power delivered, the size of the piping and the ambient temperature, you can find a relatively close answer.
cc is most often a designation of volume, cubic centimeters, not a designation of pressure. Volume cannot be converted to any pressure format. You require more data.