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

******************************************
***** Have a Spectacular Day! *****
******************************************

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

******************************************
***** Have a Spectacular Day! *****
******************************************

Thanks, that's very helpful.

On Tue, 20 Jun 2006 19:38:25 -0400, Harry Krause
wrote:

Thanks. I'm looking at a couple of different DeWalt compressors. The
differences between them seem pretty minor in terms of output.

No one ever complains that their compressor has too much capacity. If
you have the space and electric power, I'd get the biggest within
reason. If you get one with a good sized tank (= 30 gallons) and
upwards of 8 or 9 cfm, there are some really nifty air tools available
at quite reasonable prices.

"Wayne.B" wrote in message
...
On Tue, 20 Jun 2006 19:38:25 -0400, Harry Krause
wrote:

Thanks. I'm looking at a couple of different DeWalt compressors. The
differences between them seem pretty minor in terms of output.

No one ever complains that their compressor has too much capacity. If
you have the space and electric power, I'd get the biggest within
reason. If you get one with a good sized tank (= 30 gallons) and
upwards of 8 or 9 cfm, there are some really nifty air tools available
at quite reasonable prices.


I gave up on the little 2 gallon jobs and got a 16 gallon at Sears which was
the biggest that would still run on a 15 amp, 120 outlet. It came with a
air driven ratchet set that makes life simple. Also the smaller units come
with those little 1/4 inch "slinky" air lines that limit flow. The bigger
one has a much larger rubber air hose.

Eisboch

www.eisboch.com

On Tue, 20 Jun 2006 21:45:03 -0400, "Eisboch" wrote:


"Wayne.B" wrote in message
.. .
On Tue, 20 Jun 2006 19:38:25 -0400, Harry Krause
wrote:

Thanks. I'm looking at a couple of different DeWalt compressors. The
differences between them seem pretty minor in terms of output.

No one ever complains that their compressor has too much capacity. If
you have the space and electric power, I'd get the biggest within
reason. If you get one with a good sized tank (= 30 gallons) and
upwards of 8 or 9 cfm, there are some really nifty air tools available
at quite reasonable prices.


I gave up on the little 2 gallon jobs and got a 16 gallon at Sears which was
the biggest that would still run on a 15 amp, 120 outlet. It came with a
air driven ratchet set that makes life simple. Also the smaller units come
with those little 1/4 inch "slinky" air lines that limit flow. The bigger
one has a much larger rubber air hose.

Eisboch

www.eisboch.com


It's a toss up... you really want the largest one reasonable, but it's
also nice to have a small one at times.

Last week I needed to use my air nailer upstairs, and I only have a
medium-sized compressor. I had to carry the large one up on the deck,
then use two hoses to extend the air supply upstairs. A small pancake
compressor would be just fine for that use.

But for air tool use, the larger one is barely sufficient. Over the
next few weeks, I'll be hooking up a two-stage, 220v, 5hp unit in my
new shop that delivers 120psi at 18.5cfm. I'll need it to use a blast
cabinet, spray paint, and use DA air sanders.

Jack Goff writes:

Over the
next few weeks, I'll be hooking up a two-stage, 220v, 5hp unit in my
new shop that delivers 120psi at 18.5cfm. I'll need it to use a blast
cabinet, spray paint, and use DA air sanders.

You'll want a refrigerated dryer, too.

Harry Krause wrote:
Wayne.B wrote:
On Tue, 20 Jun 2006 19:38:25 -0400, Harry Krause
wrote:

Thanks. I'm looking at a couple of different DeWalt compressors. The
differences between them seem pretty minor in terms of output.

No one ever complains that their compressor has too much capacity. If
you have the space and electric power, I'd get the biggest within
reason. If you get one with a good sized tank (= 30 gallons) and
upwards of 8 or 9 cfm, there are some really nifty air tools available
at quite reasonable prices.



I don't need that much ooomph. Actually, I have switched from DeWalt to
Makita. It has a nice line of smaller compressors with good reviews.

Husky from Home Depot makes a good line, too.

On Wed, 21 Jun 2006 01:07:44 -0500, Richard J Kinch
wrote:

Jack Goff writes:

Over the
next few weeks, I'll be hooking up a two-stage, 220v, 5hp unit in my
new shop that delivers 120psi at 18.5cfm. I'll need it to use a blast
cabinet, spray paint, and use DA air sanders.

You'll want a refrigerated dryer, too.

Yeah, I've thought about that. This is my home shop, so it will only
be used occasionally. I'm thinking that water filter with an
automatic drain in line a few feet away from the compressor will
suffice for most uses. Then I'll use a dessicant dryer for when I'm
spraying. Does that sound OK?

Harry Krause wrote:
basskisser wrote:
Harry Krause wrote:
Wayne.B wrote:
On Tue, 20 Jun 2006 19:38:25 -0400, Harry Krause
wrote:

Thanks. I'm looking at a couple of different DeWalt compressors. The
differences between them seem pretty minor in terms of output.
No one ever complains that their compressor has too much capacity. If
you have the space and electric power, I'd get the biggest within
reason. If you get one with a good sized tank (= 30 gallons) and
upwards of 8 or 9 cfm, there are some really nifty air tools available
at quite reasonable prices.


I don't need that much ooomph. Actually, I have switched from DeWalt to
Makita. It has a nice line of smaller compressors with good reviews.

Husky from Home Depot makes a good line, too.



I've seen those. I'm going to check out a few. "Quiet" is important to
me, too. Well, quiet is the wrong word. Less noisy. The Makita that
interests me runs at 79dB. Most of the others I've spec'd are
significantly louder.

These are around 30 to 45 dB, but I'll bet you'll pay through the nose
for them:
http://tinyurl.com/zlnd6

If "quiet" is important, look for an oil lubed compressor, not an
"oil-less". They are quieter and last longer. They cost more and you
have to keep up the oil level. Sears has a little oil lubed unit at
around $100 on sale (don't know what the regular price is) that I was
looking at as an addition to my 30 gallon oil-less compressor. I want
one to take places with me or to carry around the house when using it
with my brad nailer. It is one near the top of the list, although I
keep getting sucked in toward cheaper oil-less units that have little
oomph and smaller tanks. The Sears unit is carryable but only has
about a 2 gallon tank. I don't remember the cfm's as that is of little
importance for what I would be using it for.

Dave Hall

On Wed, 21 Jun 2006 08:14:53 -0400, Harry Krause
wrote:

basskisser wrote:
Harry Krause wrote:
Wayne.B wrote:
On Tue, 20 Jun 2006 19:38:25 -0400, Harry Krause
wrote:

Thanks. I'm looking at a couple of different DeWalt compressors. The
differences between them seem pretty minor in terms of output.
No one ever complains that their compressor has too much capacity. If
you have the space and electric power, I'd get the biggest within
reason. If you get one with a good sized tank (= 30 gallons) and
upwards of 8 or 9 cfm, there are some really nifty air tools available
at quite reasonable prices.


I don't need that much ooomph. Actually, I have switched from DeWalt to
Makita. It has a nice line of smaller compressors with good reviews.

Husky from Home Depot makes a good line, too.



I've seen those. I'm going to check out a few. "Quiet" is important to
me, too. Well, quiet is the wrong word. Less noisy. The Makita that
interests me runs at 79dB. Most of the others I've spec'd are
significantly louder.