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It's an old Curtis from 1942. Wondering what is the purpose of the 1/4" copper line running to/from the crankcase? The opposite end is now unattached and was probably associated with the original unloader system. Should I cap it off or leave it open like a breather?

I'm about to install air compressor lines in my shop and I've read a great many of the threads on the subject but one thing still eludes me. What affect does header pipe size have on the total footage of air piping? Since I'll be doing considerable sand blasting I want the remove the great...

I've got one of these that's in VG shape in the building I'm renting for my retirement shop building. Unfortunately the natural gas has been turned off to the building but since it doesn't get too cold in SC for very long (if at all......) I'd like to just put a large propane bottle outside for...

I'm in the process of getting a 1942 Curtis model 95 up and running. Not too much info is available on this model - I've asked all the large parts suppliers and Curtis. Right now I looking for some direction on how to rebuild the top diaphragm assemblies. I've found some rubber diaphragm from...

I see that many of you folks have these old compressors from the 40'-50's. I'm working on getting my Curtis model 95 up and running and frankly I don't know much about the workings of them. What is the purpose of the copper line that runs from very the top of the unit down and into the...

Hey! to everyone. I'm recently retired after 35+ years in logistics and getting my shop set up - hopefully the last one I have to do. I rent part of a lady's metal building nearby - it helps her out with some income and it's good, secure and dry space for a shop. Also good lighting, electrical...