sorry if someones said this above , but brushless motors tend to ave higher rpm's , so you could try a lrage brushless inrunner as this would get what you need. As for the engine itself , will it start on compressed air ? you might want to assist a brushed dc motor with a leaf blower as this should get it started , or try and start it on propane ! I dont know mcuh about small jets but there my 2 p :P.