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Old 04-29-2018, 05:07 PM   #1
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Using portable compressor

I used the new viair portable compressor (450 RV) today for the first time. Actually it's the first time I've used any portable compressor

It took a surprisingly long time to get just 2-3 more psi in each tire so i was wondering if i did anything wrong. I held the gun there for a bit, released the trigger and watched the needle settle...did this several times and it would increase just a little bit so maybe 3-4 times @ 30 seconds each time to get a net increase of about 3psi

Need to let it warm up and build pressure? Maybe i had the chuck on incorrectly? ,

How does this sound vs others' experience?

Thanks
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Old 04-29-2018, 05:21 PM   #2
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Quote:
Originally Posted by Mark71 View Post
I used the new viair portable compressor (450 RV) today for the first time. Actually it's the first time I've used any portable compressor

It took a surprisingly long time to get just 2-3 more psi in each tire so i was wondering if i did anything wrong. I held the gun there for a bit, released the trigger and watched the needle settle...did this several times and it would increase just a little bit so maybe 3-4 times @ 30 seconds each time to get a net increase of about 3psi

Need to let it warm up and build pressure? Maybe i had the chuck on incorrectly? ,

How does this sound vs others' experience?

Thanks
I think that is normal for the ViAir 450RV; it has good pressure capability but doesn't have much volume. There have been other threads discussing portable air compressors where this has been mentioned.

I prefer the Porter Cable CMB-15 portable compressor that seems to have quite a bit more volume resulting faster inflation. That said, the 450RV is a very compact unit and is capable of doing the job, though it may take a little longer.

TJ
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Old 04-29-2018, 05:39 PM   #3
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I have a 450 RV and it works much faster than what you are describing. If it the first time using it did you remove the filter plug and replace it with the screw on filter.

Than I have to ask why are you releasing the handle. Is it to check the gauge pressure. If you canít figure it out call Viair and they will know exactly what wrong. They were very helpful to explain their system.
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Old 04-29-2018, 09:33 PM   #4
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I kept releasing the handle because as I held it to inflate, the needle moved up only imperceptibly. When I released the first time, it went back down and then adjusted up to "settle" marginally higher than it was previously. So I did that several times.

I have to go back and look at the filter plug to see if I removed it. There were so many fittings and connections that I honestly can't remember; it's nighttime and the thing is put away in the basement.

There was no real operating manual or instructions with it so I was combination reading the box, a very small little pamphlet inside, and something I downloaded from their website. But it sounds like the slowness that I report doesn't match your experience. So I'm going back and look at the filter plug issue

THANKS
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Old 04-30-2018, 04:31 AM   #5
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I think you are bumping up against the limitations of most portable compressors. As you reach the upper psi limit you have very little differential between max compressor psi and the tire psi. It's like trying to inflate (by mouth) an already filled balloon.
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Old 04-30-2018, 04:54 AM   #6
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You didn't mention your air hose size and/or quick disconnect....if you are using a QD. A 1/4" I.D. hose isn't going to allow as much air flow as a 3/8" I.D. hose, so that may be part of it. Also, not all Q.D's are the same. Some brands/model number have larger openings than others. Anything that is smaller will obviously impede the volume of air moved by the compressor.
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Old 04-30-2018, 04:58 AM   #7
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I have the Porter Cable compact 120vac compressor and a Viair 450 RV 12vdc. The Viair is definitely slower on the motorhome. I use the ViAir in the jeep to air up after offroading. And use the Porter Cable with the motorhome.

So as to not have to stay bent over and holding the air chuck, put together a gauge and ball valve that plugs inline. Makes it way easier.
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Old 04-30-2018, 06:17 AM   #8
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I recently purchased the 400P-RV Viair compressor. I was uncertain as to which model to get, so I called Viair for guidance. I was thinking about the 450, but the customer service tech steered me to the 400P for faster fill rates. The issue is that the 450P is a 100% duty cycle compressor which I think means it will run and run and run without clicking off for thermal protection. That also means it has to pump less air to keep that cool. The 400P is only a 33% duty cycle, but it fills much faster before it ever gets too hot to click off on its own.

Maybe you can do an exchange.
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Old 04-30-2018, 06:49 AM   #9
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I also have the Viair RV model and had the same results as you Mark. The compressor produces high pressure, but with low volume. It does take awhile to add air to the large motorhome tires. My Entegra tires had a max rating of 125 psi. When I put the coach in storage for the winter I would fill all tires to 120. It took several minutes to bring my rear duals from 95 up to 120. The Viair is a good compressor but Iím going to look for something else.

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Old 04-30-2018, 03:41 PM   #10
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It takes a while, but much better than the alternative.

[mod edit]
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Old 04-30-2018, 07:52 PM   #11
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My guess is if you don't remember removing the plug, you probably didn't. On the info slip in the box it does show you how to remove it. All that being said, the first time I used my Viair it took longer than I expected. Then I got thinking about the last time I replaced two tires on my mh. The tire techs got the tire on the rim, turned on the compressor, lit up a cigarette and took a break while the tire was being inflated. All they did was truck tires so I assume they had a pretty good compressor. It just made me think, maybe this thing is not so slow after all.
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Old 04-30-2018, 09:01 PM   #12
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Thanks everyone. Very helpful perspectives.

I'm pretty sure i removed the plug when i first opened the box to look at everything; and then put it away for several weeks before using it for the first time yesterday

Sounds like it is slow and my experience normal
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