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Old 02-15-2018, 12:14 PM   #1
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Viair portable compressor

I am considering purchasing a Virair 400p-rv compressor for the MH and was wondering if any of you had one and if so your thoughts.
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Old 02-15-2018, 12:18 PM   #2
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Quote:
Originally Posted by TexAg View Post
I am considering purchasing a Virair 400p-rv compressor for the MH and was wondering if any of you had one and if so your thoughts.
The Viair has a good reputation but if I were buying, I'd spend the extra couple bucks and get the 450P for its 100% duty cycle.

The VIAIR 450P Automatic Function Portable Air Compressor is the only 100-percent duty cycle portable compressor on the market, and can run for extended periods of time depending on your environment. Its automatic pressure regulation system is designed to maintain an internal tank pressure of 145 PSI by cycling power to the compressor motor. This compressor is also equipped with a detachable gas-station-style inflation gun, which allows you to easily fill tires with a simple squeeze of the handle. This inflation gun can also show current tire pressure, so you don't need an additional pressure gauge.

400P Spec.
Powered direct to the car battery with alligator clamps, Duty Cycle: 33 percent @ 100 PSI Max. Working Pressure: 150 PSI Max. Amp Draw: 30 Amps Tire Inflation Gun with 130 PSI Inline Gauge
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Old 02-15-2018, 01:03 PM   #3
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I am considering purchasing a Virair 400p-rv compressor for the MH and was wondering if any of you had one and if so your thoughts.
I have the 400. Its perfect for my 19.5 tires
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Old 02-15-2018, 01:43 PM   #4
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I agree with Dennis. I have the 450 and it is great! A little expensive but worth it for what it does.

https://www.gosale.com/5849124/viair...SAAEgJUufD_BwE
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Old 02-15-2018, 02:03 PM   #5
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I have the 400p-RV works great on my 22.5 tires.
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Old 02-15-2018, 03:10 PM   #6
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Originally Posted by dennis45 View Post
The Viair has a good reputation but if I were buying, I'd spend the extra couple bucks and get the 450P for its 100% duty cycle.

The VIAIR 450P Automatic Function Portable Air Compressor is the only 100-percent duty cycle portable compressor on the market, and can run for extended periods of time depending on your environment. Its automatic pressure regulation system is designed to maintain an internal tank pressure of 145 PSI by cycling power to the compressor motor. This compressor is also equipped with a detachable gas-station-style inflation gun, which allows you to easily fill tires with a simple squeeze of the handle. This inflation gun can also show current tire pressure, so you don't need an additional pressure gauge.

400P Spec.
Powered direct to the car battery with alligator clamps, Duty Cycle: 33 percent @ 100 PSI Max. Working Pressure: 150 PSI Max. Amp Draw: 30 Amps Tire Inflation Gun with 130 PSI Inline Gauge

YUP!
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Old 02-15-2018, 07:14 PM   #7
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I don't really know what duty cycle means but according to Viair web site the 400 has a faster fill time than the 450. Why would I not want the one with the faster fill time?
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Old 02-15-2018, 07:45 PM   #8
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I don't really know what duty cycle means but according to Viair web site the 400 has a faster fill time than the 450. Why would I not want the one with the faster fill time?
Duty cycle is the amount of time that the air compressor can run under a load before it needs to be shut off and allowed to cool. Usually, but not always, the time period for example might be 15 minutes on, 15 minutes off.....in other words it's not rated for continuous duty.....constant run time under a load.
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Old 02-15-2018, 07:54 PM   #9
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i use a 400. when i air the jeep tires down to 15lbs it runs all four up to 35 for the trip home- will pump up a 285/22.5 from 100lbs to 115 in reasonably short time. have used it quite a lot on rzrs and dune buggys [low pressure, lots of volume] .i've never have it shut off due to the duty cycle - or any other reason. if it dies, i'll go get another one just like it
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Old 02-16-2018, 04:08 PM   #10
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I've had several 12 volt compressors, none much good. Never used a Viair, but for lots less money, you can get a Porter-Cable 6 gallon 150 PSI AC powered compressor...$99.00.
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Old 02-16-2018, 04:25 PM   #11
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The Via Aire units are deluxe; The duty cycle means how long is the run time-i.e. 50% duty cycle is x min on, then x min off. The 450 has a 100% duty cycle-you can just let it run, is my understanding.

I'm with the Catman on this. My pancake fills tires in seconds, not minutes, and I can buy three of them for the price of one Viair! But the ViAir are nice!
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Old 02-16-2018, 04:53 PM   #12
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Originally Posted by TexAg View Post
I don't really know what duty cycle means but according to Viair web site the 400 has a faster fill time than the 450. Why would I not want the one with the faster fill time?
It really depends on how much air you are going to need.

The 400 will faster and harder for a shorter period of time.
The 450 is slower, will be some what quieter, stay cooler and run approximately 3 time longer. est. 10 minutes vs. 30

I call Viair before I bought my 450 and they were quite
willing to explain the difference. We probably don'T need the 450 but it is nice to have simply because it works longer without shutting off to recover.
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Old 02-17-2018, 07:50 AM   #13
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I went with the 300p.
Smaller, lighter and less expensive.
Only carry for emergency flat and figure I can live with the 33% duty cycle.


Haven't tried it yet.
Have a larger tank compressor at home for maintenance.
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Old 02-17-2018, 08:32 AM   #14
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I am considering purchasing a Virair 400p-rv compressor for the MH and was wondering if any of you had one and if so your thoughts.
I just bought the Vlair 400P last week, John, after scratching my head on what to get. The 400P worked fantastic. I got it mainly to top up my front 315 tires to 125psi. My on-board air only gets to about 110. Purchased the 400P for $166 on Amazon and got it in 2 days. Took about 5 minutes to go from 110psi to 125psi. Comes with nice carry bag. Note though, I did not get the 400P-RV, which comes with an extra length hose and a few more attachments. I really didn't need these attachments so saved a few $ with the 400P.

P.S.: Some folks on the forum have installed an air pressure "doubler" that increase your onboard air pressure. Takes some air piping work. Might want to do a search and find that if you're interested.

Good luck!
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