Question about SCFM on air compressor

[Meestahbig]

I am looking to buy an air compressor, but am not clear on one thing. I am looking to use this for light use of air ratchet and air hammer, also to use it for detailing my car...

f the machine has an SCFM rating of 4.2, but the air ratchet has a rating of let's say 5.0, will the compresoor be able to run this tool for short bursts when the tank is full. I understand that it would not be able to run this continuous, as the motor wouldfill the tank with less air than the tool requires, but for short bursts it should work. right or wrong???

thx, Big