While we're on the topic of compressor cooling, here's a chart I made a few years back detailing the temperature difference a cooling fan makes on a VIAIR 90C air compressor...
https://docs.google.com/spreadsheet/ccc?key=0AqQx991m_YKGdEc3OV9NbG10YmluNjM2UFRhYV9Gb lE&usp=sharing
Hopefully someone finds this useful.
