Bird,
<font color="blue"> If his compressor will move 6.4 SCFM at 90 psi and the impact wrench is rated to use 5 SCFM at 90 psi, no problem at all. </font>
I understand what you're saying. My comment, however, was directed at GaryK's statement:
<font color="blue"> most impacts use a lot of air, generally over 90CFM </font>
I use my IR-261, 3/4" wrench to loosen the blade bolts on my BushHog Squealer brush hog. It works with my little compressor, but the air runs down fast. I get the feeling the wrench would have even more "power" if the air flow was higher, even at the same pressure (ie 90 psi).
In fact, I have no idea what the recommended or optimum air flow is for an IR-261 or if my little Sears compressor even comes close.
OkieG