[Shop-talk] single vs. dual stage compressors

[Mark Andy]

Howdy,

Whats the deal with single vs. dual stage compressors?

I've long been thinking that I'd want to get a decent 60 or 80 gallon two 
stage compressor when I upgrade next.  But I was reading the recent TP 
Tools thanksgiving sale flyer and they had some listings for High output 
single stage compressors.

One in particular was $650 and has a working pressure of 95-125 psi, with 
16.5 cfm @ 90 psi (Eagle brand three cylinder 5 hp running, 23A at 230VAC, 
7hp peak, 60 gallon).  No spec on pump rpm.

That's as compared to $1300 for a Champion 5hp two stage, @19.1 cfm @125 
psi, 22A @230vac.  The pump rpm on this one is 805rpm

I realize that 19.1 cfm @ 125psi is more air that 16.5 cfm @ 90 psi, but 
would I ever care about that?  I'm going to be a single user using normal 
air tools like cut offs & body sanders, plus a blast cabinet, perhaps 
painting a car, etc.

Currently I have a Craftsman direct drive single stage that says it does 7 
scfm @ 90psi... That thing won't keep up with a cutoff very long.

Half price is pretty attractive if it'll do what I need it to do...

Mark