Looking for plans/instructions

Sometime in the distant past, I recall seeing ads for plans to convert an automotive A/C compressor to a steam or air motor.  These were supposedly simple enough that they could be done with a drill press. Now that I'm interested in playing with something like this, I can't find a bit of info on it.  Anyone know where it's hiding, or did I hallucinate the whole thing?  ¶ 10/23/2008 09:53:00 AM