You could always pull 3 #8's through and run your compressor on 40 amp
240 volts. This would be a seperate cirucuit, would not run through the
sub panel.

andy wrote:
Thanks for all the suggestions. will look into poly-flo and parker
flex.
The conduit is existing, and housed the garage's old electic supply
(one lightbulb)

I have since burried a new electric service (50 amp subpanel, direct
burrial cable) for the welder,tablesaw,planer..... so I am pushing what
I have available for ampacity in the garage. My thought was to keep
the compressor in the basement shop where there is lots of ampacity
available, and have air drops in both the basement and garage. My air
use at the moment is more a novelty than any thing else. I use it to
blow dust off things and dry things off.

I guess I am a victim of :I should have put a larger service into the
garage, I should have burried it in a conduit, I should have installed
an extra conduit, ect. I should have "thought big" from the
beginning.

Thanks again for your responses, and hi to rex....roger
Andy
lynn, lynn.....