Harry,

There is undoubtedly a formula but I don't know nor care what it is. All
else being approximately equal the compressor with a higher CFM output will
fill a tire or anything else faster including it's own receiver (tank).
Higher CFM is better unless the amperage draw is higher than the rating of
the protecting breaker. Inrush is also a factor but for us poor user slobs
it's another big "who cares".

Butch
"Harry Krause" wrote in message
. ..
JohnH wrote:
On Tue, 20 Jun 2006 08:58:09 -0400, Harry Krause
wrote:

I'm looking for a new semi-portable air compressor for various purposes.

Here's a spec for the models I am considering.


CFM/PSI 3.6@100 3.8@100 4.5@100


Let's say I have a tire on a 17" wheel to fill to 55 psi.

What is the approximate time it will take each of these compressors to
fill the tire, everything else being equal?

Is there a formula?

Thanks (English major here)

Harry, I have a 2.9 cfm at 90 psi, with no tank (an el cheapo from Sears)
that I use only for tires and soccer balls. It takes me about 30 seconds
to
raise the tire pressure from 25 to 35 psi on my pickup.
--
John H

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Thanks, that's very helpful.