The Bombardier CRJ900 is powered by two General Electric CF34-8C5 turbofan engines that produce 14,510 pounds (63.2 kN) of take-off thrust. These same engines also power the CRJ700 and CRJ705, allowing for greater commonality between family members. Originally developed for the United States Air Force, the CF34 family has over 20 million flight hours and is highly regarded as one of the most reliable and efficient powerplants built. In addition to having improved fuel and cooling efficiencies, the Bombardier CRJ900 Series' powerplant delivers a performance envelope comparable to that of a mainline jet.
Bombardier CRJ900 inaendeshwa na injini mbili za General Electric CF34-8C5 turbofan zinazozalisha pauni 14,510 (63.2 kN) za msukumo wa kuondoka. Injini hizi pia huendesha CRJ700 na CRJ705, ikiruhusu usawa zaidi kati ya wanafamilia. Hapo awali iliundwa kwa ajili ya Jeshi la Anga la Marekani, familia ya CF34 ina zaidi ya saa milioni 20 za ndege na inachukuliwa kuwa mojawapo ya mitambo ya kuaminika na yenye ufanisi iliyojengwa. Kando na kuwa na utendakazi ulioboreshwa wa mafuta na kupoeza, mtambo wa kuzalisha umeme wa Bombardier CRJ900 Series' hutoa bahasha ya utendakazi inayolingana na ile ya ndege kuu.