Well, I was wrong in saying there were several threads on "those units". Should have said there are several threads on those types of units.
Sorry I interjected without any useful information, and suggesting you run a search... here, let me help...
I spent a few seconds, did a single search here on GJ for "antique compressors". One thread hit that came up is this one-
http://www.garagejournal.com/forum/showthread.php?t=27378&highlight=antique+compressor . Thread posts #35-41 have info on a Curtis. I didn't read beyond that, the thread may have more info.
I'm sure if you spent a few minutes trying different search keywords and digging through some of the other compressor threads, you can find out more.
I spent another few seconds and plugged a search for "Curtis Compressor C90 CFM" into Google. Got lots of hits on this forum, other forums, parts suppliers, etc. all pertaining to a Curtis C90 compressor. Read two forum posts under one search result and found that they were (mostly) a 3hp compressor run off a 3-phase motor, putting out about 12 CFM. Not sure if that is how yours is/was set up or not, but hopefully that information is useful.
