I have an Idea to make an air compressor that i doubt any one has thought of before, an air powered air compresor. THe basic idea is to replace the motor with an impact wrench and have the wrench drawing air from the compressor a the same time the pump is suplying air to the tank. The compressor would have to be compressed the first time though anaxilary source, but if the tank doesnt leak it can alwase produce all of the power i needs. the impact would be tunrned on and off by means of a ball valve