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Old 12-17-2012, 05:17 PM   #1
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Portable Air Compressor

once a day of offroading is done and i need to fill my tires back up i usually drive awhile before i have the chance to fill my tires back up. i need a smaller/portable air compressor that i can stick in the back of my jeep so i dont have to drive out of my way to fill them back up and perferably under $100... any suggestions?

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Old 12-17-2012, 06:08 PM   #2
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For your budget, the MV50 would fit your needs. It's not the quickest but it does do the job.

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Old 12-17-2012, 06:21 PM   #3
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I've been using a VIAIR 85P Portable Air Compressor and it's not what you would call fast, but works pretty good as long as you connect directly to the battery. I cut the cigarette lighter plug off it and soldered on the battery clips.
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Old 12-17-2012, 06:59 PM   #4
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Good post, I've been looking for a decent priced air compressor. It seems like not enough room in the tj to run a complete obo kit.
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Old 12-18-2012, 08:10 AM   #5
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I have the MV50 works great. I mounted it under the hood so it's always with me. It takes 2 minutes to fill a 10.5X31 from 15lbs to 30lbs.
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Old 12-18-2012, 08:12 AM   #6
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Originally Posted by IslandTJ View Post
For your budget, the MV50 would fit your needs. It's not the quickest but it does do the job.
I've been using one of these for many years (Master Flow MF-1050, same unit)
This compressor will fill a 33x12.50-15 tire from 15 psi to 30 psi in 3 minutes.

~15 mins to refill your tires isn't a big time penalty when you can do it literally anywhere.


Good price, free shipping on Amazon:

Amazon.com: Q Industries MV50 SuperFlow High-Volume 12-Volt Air Compressor: Automotive
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Old 12-18-2012, 08:14 AM   #7
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Old 12-18-2012, 10:25 AM   #8
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I have the MV50 works great. I mounted it under the hood so it's always with me. It takes 2 minutes to fill a 10.5X31 from 15lbs to 30lbs.
Where in the hood do you have a pic? Did you hardwire it or use the clamps?
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Old 12-18-2012, 10:40 AM   #9
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I know this will be a little over the mentioned budget, but thought I would suggest anyways. The VIAIR 300P is a good choice. It has good air flow and is a quality product that you know will last. Hooks directly up to your battery and comes with the bag also.

VIAIR 300P 12v Portable Compressor 30033 - Onboard-air.com

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Old 12-18-2012, 10:47 AM   #10
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I have a Viair 450P. It's stupid slow and I really need to get something else before I get 35s.

OP Look into CO2 setups. It's fast but the only thing is that the air isn't free and it takes up space.
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Old 12-18-2012, 10:53 AM   #11
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I don't recommend the 450P much for that reason. Because it can run for a long time, the motor runs slower and has slower fill times. In 95% of the applications, that 100% duty cycle is not needed, and the faster 33% does just fine, with plenty of run time left over after filling your tires. In the OP case, the 300P comes close in his budget, and will fill faster than the smaller compressors that plug into the power port.

The 300P isn't technically rated to do the 35" tires, but it definitely can.

35" Tire Fill Times for 15-30 PSI
300P: Appx 3 min. 20 sec.
400P: 2 Min. 20 Sec.
450P: 3 Min 30 Sec.
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Old 12-18-2012, 10:57 AM   #12
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Hey Airwerkz, can you tell me the pros and cons of have a OBA with a tank and one with just the pump. I need one to fill up tires (31's) and thats it no lockers or anything else. I've been window shopping for a setup and was wondering iff its worth going with a tank. Btw i was wanting to do a trainhorn would it work without the.tank too? Thanks
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Old 12-18-2012, 12:15 PM   #13
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The advantage of the tank would be to give you a head start on the first tire. After that, it would be solely running off the compressor. The tank won't have enough volume to fill a complete tire, but would definitely make that 1st one go faster. Of course, air tool usage, etc. In order for the air horn to work, you will need a tank, as the ocmpressor won't have enough CFM and "burst" of air for the horn.

If just looking to fill tires (no horn), I would recommend out 400H kit. It comes with the fill hose. Just mount on the Jeep, hook straight to the battery, and you are ready to go. It has a built-in on.off switch on the back cover.

VIAIR 400H Hardmount Compressor 40042 - Onboard-air.com

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Old 12-18-2012, 01:58 PM   #14
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I am probably going to get flamed for recommending this, but if you want a portable air compressor, I would go with a Smittybilt #2781. It is twice as fast as most 12v portable compressors out there @5.65 CFM. They make a smaller one also #2780, but it is just as slow as all the rest of them.

I have had this compressor for almost 2 years with no problems. It fills up my 35's as fast as my buddies' OBA systems. The only thing that takes me longer is packing it all back up in the bag. They are selling for $145.00 with free shipping at Amazon. I would rather have OBA, but I won mine at a Jamboree.

The Smitty 2781 is on the left next to my other compressor. It's bigger!

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Old 12-18-2012, 02:08 PM   #15
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I don't want to talk bad about another brand, but they are also build with lesser quality materials vs. the VIAIR. I know some guys have had them for years, while others have had them fail shortly after. In general, a VIAIR is very well built and will last for many years to come. In my opinion, the 5.65 CFM might be skewed as well.

I do understand where you are coming from though, and the price is attractive. Just wanted to share my thoughts as well. No flaming....
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Old 12-18-2012, 02:18 PM   #16
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The advantage of the tank would be to give you a head start on the first tire. After that, it would be solely running off the compressor. The tank won't have enough volume to fill a complete tire, but would definitely make that 1st one go faster.
Only if you're running a small low-CFM compressor. I ran a tank with my York compressor & it would refill between tires.
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Old 12-18-2012, 02:23 PM   #17
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Yes, good point.... that is true. My statement applies to 12v compressor systems.
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Old 12-18-2012, 02:33 PM   #18
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I don't want to talk bad about another brand, but they are also build with lesser quality materials vs. the VIAIR. I know some guys have had them for years, while others have had them fail shortly after. In general, a VIAIR is very well built and will last for many years to come. In my opinion, the 5.65 CFM might be skewed as well.

I do understand where you are coming from though, and the price is attractive. Just wanted to share my thoughts as well. No flaming....
Yes, the price I paid was attractive. $1.00 raffle ticket.
Can you provide some more info to back your statement about the lesser quality materials of the Smitty vs Viair? Is it because the Smitty is made in China?

Quote:
Originally Posted by VIAIR
About VIAIR -
The VIAIR factory is located in China. Our factory is ISO certified and our compressors are CE certified. Our products were engineered in the U.S., made to specification, and our QC is done both in the factory and at our warehouse.
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Old 12-18-2012, 02:43 PM   #19
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THe VIAIR uses a PTFE piston ring and hardcoat anodized cylinder, which will greatly increase it's life. Has a built-in thermal overload protector (Smitty, IIRC doesn't). Stainless valves on the piston and the unit is moisture and dust resistant and durable against the elements. It uses o-rings to seal in between the separate components of the compressor. Also the design is improved, since the cylinder make full contact with the heatsink, to help keep heat down which greatly extends life also.

Found on another forum of comparison photos showing the difference after the same amount of usage.




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Old 12-18-2012, 02:49 PM   #20
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^ That makes sense. Better quality for hardwiring under the hood I guess. I don't think I would attempt that with one of the other brands.
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Old 12-18-2012, 03:02 PM   #21
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I don't know anything about the Smitty compressors, but dad got the VIAIR 400P for his JK (35" tires) and that thing is a HOSS! I'm looking at the 88P as I don't have $150-$200 to drop on a compressor for the 300P or 400P, but who knows...I might just steal dad's.
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Old 12-18-2012, 04:11 PM   #22
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The Viair 400 series and the MV50 share a large number of design elements. Are the few improvements of the Viair version sufficient to justify a price tag which is four times that of the MV50? That is up to each individual purchaser.

For the money, I think the MV50 is just about unbeatable. I've got one and I am very satisfied with its performance--it is an incredible value. If I were looking to spend Viair 400 amount of money, I would skip the wimpy 12v compressor idea entirely and instead build an onboard York-based system. But maybe that's just me.
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Old 12-18-2012, 04:16 PM   #23
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Originally Posted by AirWerkz View Post
The advantage of the tank would be to give you a head start on the first tire. After that, it would be solely running off the compressor. The tank won't have enough volume to fill a complete tire, but would definitely make that 1st one go faster. Of course, air tool usage, etc. In order for the air horn to work, you will need a tank, as the ocmpressor won't have enough CFM and "burst" of air for the horn.

If just looking to fill tires (no horn), I would recommend out 400H kit. It comes with the fill hose. Just mount on the Jeep, hook straight to the battery, and you are ready to go. It has a built-in on.off switch on the back cover.

VIAIR 400H Hardmount Compressor 40042 - Onboard-air.com
Thanks for that. Where do you guys hard mount your OBA'S? I was thinking of on top of the rear wheelwell.
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Old 12-20-2012, 01:33 PM   #24
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Thanks for that. Where do you guys hard mount your OBA'S? I was thinking of on top of the rear wheelwell.
On the older Jeeps, you can usually find a location under the hood, but if not, on top of the fender well would be Ok. All VIAIR compressors come with the hardware and fittings to remote mount the intake. So, if you're mounting in a spot that might see some of the elements, then you can move the filter to a dry location.
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Old 12-20-2012, 02:25 PM   #25
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i use the 88p works good for one jeep.
VIAIR Corporation - 88P Part No. 00088
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Old 12-21-2012, 10:27 AM   #26
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I have had 5 mv50 pumps with no issues. I'm still working on mounting 2 of them on my jeep with a 2.5g tank.
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Old 12-27-2012, 07:00 PM   #27
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mv50 for $45 on Amazon. Can beat that.
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Old 12-28-2012, 11:18 AM   #28
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Where in the hood do you have a pic? Did you hardwire it or use the clamps?
Attached are some photos of the mounting location and where I located the quick connects, one on each side under the door.
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Old 12-28-2012, 11:34 AM   #29
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I can't speak about the VIAIR product because I don't have one but the MV50 has worked out for me and my amount of usage. I don't have a tank yet but I am planning to install on some day. I my MV50 to filled my tires as well as the tires of a friend that was with me. It filled all 8 tires and never shut off on duty cycle. It took 2 minutes per tire to go from 15lbs to 30lbs 31x10.50 tires. If always wheeled in the middle of nowhere I would have made a different discussion on pumps but for beach driving it's more than enough.

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