Ever felt the need for more horsepower. The RS-25 engine has more that you need. 12 million horsepower. Fuel pumps that could drain a swimming pool in a minute. 200 Horsepower/kilogram power to weight ratio. One blade of its turbine produces as much horsepower as a Corvette ZR1 You may find it hard to fit on your bike though. The SR-25 ex space shuttle engines are being tested with the goal of using them on the new Space Launch System (SLS). While the shuttle engines were re-usable they will be single use on the SLS. Current testing is aimed at peaking the performance and simplifying the design for single use roles. RS-25 Meeting the Need for Speed.