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Old 08-04-2009, 03:39 PM
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Does air hose I.D matter?

Hi all,

I have an Astro Evo 1.4mm spray gun. I am using 3/8" I.D air hose and I can't set the psi right...it always read at 8 psi with trigger pull..plus I turned the regulator all the way up...the gun stated air in 16-19 psi

I read the spec and it said Air Inlet I.D is 1/4"..

My question is does the air hose I.D matter?

My A.C is 8.6cfm @ 90 5.5hp 30gal

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Old 08-04-2009, 04:50 PM
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Hose size does make a difference. You can change your air fitting to a higher flow. A few companies have them where they have a larger ID on the fitting.

Check this for Milton or Airflo fittings http://www.azautobodysupply.com/airtofi.html
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Old 08-04-2009, 05:09 PM
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dont own an astro but make sure the air is turned up at the gun its self.
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Old 08-04-2009, 05:23 PM
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Quote:
Originally Posted by Kevin45
Hose size does make a difference. You can change your air fitting to a higher flow. A few companies have them where they have a larger ID on the fitting.

Check this for Milton or Airflo fittings http://www.azautobodysupply.com/airtofi.html
I have 3/8" hose now, can I downsize to 1/4" as the gun reccommended..

is that OK
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Old 08-04-2009, 06:54 PM
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No, NO, you don't want to downsize! You want at big a hose as you can haul around. You want as big of pipe, and as big of hose as you can get away with.

A quarter inch hose is WAY too small for any HVLP gun. You need VOLUME (the V in HVLP) and the larger hose gives you that.

Brian
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Old 08-04-2009, 07:00 PM
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Quote:
Originally Posted by MARTINSR
No, NO, you don't want to downsize! You want at big a hose as you can haul around. You want as big of pipe, and as big of hose as you can get away with.

A quarter inch hose is WAY too small for any HVLP gun. You need VOLUME (the V in HVLP) and the larger hose gives you that.

Brian

it's not the HVLP. it is an Astro Evo LVLP
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Old 08-04-2009, 07:01 PM
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The size of your air hose is not the problem. All my guns have 1/4 inch inlets and all my hoses are 3/8's.

You bought a made in Japan spray gun and probably purchased their regulator. The regulator is your problem.
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Old 08-04-2009, 07:04 PM
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What's the cfm rating of your gun with the trigger pulled? Does it exceed the cfm capacity of your compressor?
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Old 08-04-2009, 07:04 PM
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Quote:
Originally Posted by cjperotti
The size of your air hose is not the problem. All my guns have 1/4 inch inlets and all my hoses are 3/8's.

You bought a made in Japan spray gun and probably purchased their regulator. The regulator is your problem.
As you said I can't use regulator from HF or other brand...I have to buy same brand as the gun?
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Old 08-04-2009, 07:10 PM
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Quote:
Originally Posted by AntnyL
What's the cfm rating of your gun with the trigger pulled? Does it exceed the cfm capacity of your compressor?
Spec data said 16-19psi. 9cfm

I have Digital Reg and with the trigger pulled it reads only 8-9 psi with 3/8" air hose

So I went to change air hose to 1/4" and it jump to 20psi
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Old 08-04-2009, 07:16 PM
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What in the world are you talking about? If you want a decent regulator for your gun go over to Lowes and purchase their 1/4 inch inlet regulator for $14.95 and mount it on your gun. I have one on my primer gun and swear it preforms as well as my Devilbiss regulator on my spray gun.
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Old 08-04-2009, 07:22 PM
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Do you actually have 3/8" ALL the way from the regulated source? It won't matter if you have a 1" hose if it is choked down by a small or obstructed fitting somewhere between the regulated air supply and the gun regulator. I have even seen Chinese made fittings that were so poorly made and rough inside that even though they may have been for 3/8" they would not flow the equivalent of a 1/4" fitting. Make sure you don't have a restriction somewhere in the system, it sounds as if you do.
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Old 08-04-2009, 07:45 PM
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Quote:
Originally Posted by oldred
Do you actually have 3/8" ALL the way from the regulated source? It won't matter if you have a 1" hose if it is choked down by a small or obstructed fitting somewhere between the regulated air supply and the gun regulator. I have even seen Chinese made fittings that were so poorly made and rough inside that even though they may have been for 3/8" they would not flow the equivalent of a 1/4" fitting. Make sure you don't have a restriction somewhere in the system, it sounds as if you do.
I have 1/4" fitting and 3/8" air hose...it made by craftsman I believed...

When I switched to 1/4" air hose my guns work very good...so far i have test them and it works very well...I will try to shoot some clear tomorrow to see if i still get milky look...I always get milky look on clear..it seems like it lacked of air..
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Old 08-04-2009, 07:55 PM
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Quote:
Originally Posted by cjperotti
What in the world are you talking about? If you want a decent regulator for your gun go over to Lowes and purchase their 1/4 inch inlet regulator for $14.95 and mount it on your gun. I have one on my primer gun and swear it preforms as well as my Devilbiss regulator on my spray gun.

Ok I bought a digital one from H.F..when I was using 3/8" it will never get to 20psi @ the reg..but then I switched to 1/4" I get 20psi with trigger pulled..
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Old 08-05-2009, 04:49 AM
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1/4 in hose is for an air brush. you will not get enough flow with it no matter what pressure it reads.
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