Where to find air compressor schematics and homebuilt designs

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Shawnzyoo
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Does anyone know of any sites that have a good schematic of an air compressor?
or possibly some sites about homebuilt air compressors?
thanks
 
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There are so many units available its doubtful that you would be able to build one cheaper than buying a second-hand one, and with so many risks if your pressure storage system would fail and propel shrapnel that I must ask why would you home build this?

There are a few designs but a popular air compressor pump is a piston design that is much like a regular 4-stroke engine except it only has the intake and exhuast cycles.
 
Since you are talking about a homebuilt compressor, I am assuming that you are interested in a reciprocating compressor. Since compressors are on the competitive side, I don't think you'll have much luck finding a cross section of one. There are a lot of manufacturers out there that have pretty informative web sites. One of the more general ones that should have some good info for you is here:

http://www.knowpressure.org/