I have a 3 hp motor driving it and it sits on the 44 gallon tank and it fills it in about 1/3 of the time my other compressor usually takes to fill it’s 35 gallon tank. The two phase compressor builds the air to one hundred forty hp quickly http://lukasswbay.blogoscience.com/8378355/the-5-second-trick-for-air-receiver-tank