with a 13hp engine mount a 11gpm 2-stage hyd pump,that'l give you fast response times with 3in bore cyls and it will kick down the pump into the low section for digging power at a lower flow rate..you can vary the engine rpm easily with a 2-stage pump you can run lower rpms..easier to control and on the ears as well..surpluscenter has good deals on surplus cyls,theyve always been good FWIW.
