Portable Compressor Viair 300P or 440P vs Smittybuilt 2781 - JeepForum.com
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post #1 of 36 Old 03-27-2018, 02:33 PM Thread Starter
Kev M
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Portable Compressor Viair 300P or 440P vs Smittybuilt 2781

I've got some friends who asked me to research portable compressors for them.

They currently use a Viair 85P and their chief complaint is that it takes too long. They use it up to a few times a day, a well or more at a time when staying at their OBX house in the gives dunes so they de-air down to 18-20 every time they hit the beach/dunes coming or going to/fro the house.

85P - 1.26 CF/M rating

http://www.viaircorp.com/portables/85p/

300P - 2.3 CF/M rating

http://www.viaircorp.com/portables/300p/

440P -3.0 CF/M rating

http://www.viaircorp.com/portables/440p/

Or

Smittybuilt 2781 - 5.65 CF/M (supposedly, if I'm reading it right)

https://www.smittybilt.com/product/index/32.htm

https://www.quadratec.com/products/92043_8005_07.htm


So if I'm looking at the right specs the Smittybuilt unit would seem to have an edge on CFM and at a price about $100 lower than the 440P and about equal to the 300P.

What am I missing?

Anyone have experience with any of these units and can comment?

They're not looking for an OBA system, just something more convenient than their current tiny unit.

Thoughts/experience?


Current Jeep: 2016 JKUS - My Mall/Beach/Dunes/Forest crawler - lightly modded
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post #2 of 36 Old 03-28-2018, 12:27 AM
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I donít have experience with either, but the CFM values you listed are at 0 psi. From the link the smittybilt doesnít say so Iím just assuming. The viair actually lists the cfm at different pressures which is the important part as the cfm at 0 pressure is never really used for tires. For example the viair has 1.62 (300p) and 2.3 (440p) at 30 psi which is more relevant for tire inflation. I would assume the smittybilt one has a more substantial drop in cfm. Viair also has fill times from 15-30 and 0-30 psi for different tire sizes
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post #3 of 36 Old 03-28-2018, 04:36 AM Thread Starter
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Originally Posted by Mattific View Post
I donít have experience with either, but the CFM values you listed are at 0 psi. From the link the smittybilt doesnít say so Iím just assuming. The viair actually lists the cfm at different pressures which is the important part as the cfm at 0 pressure is never really used for tires. For example the viair has 1.62 (300p) and 2.3 (440p) at 30 psi which is more relevant for tire inflation. I would assume the smittybilt one has a more substantial drop in cfm. Viair also has fill times from 15-30 and 0-30 psi for different tire sizes
Thanks for the response. I was suspicious about the relevance of the Smittybuilt cfm number when compared to the Viair just based on the sparsity of similar data and the comparative pricing.

I'll go back and look closer at the Viair data and compare what they have to the 300p and 440p.

Still welcoming more opinions of course.

Current Jeep: 2016 JKUS - My Mall/Beach/Dunes/Forest crawler - lightly modded
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post #4 of 36 Old 03-28-2018, 05:33 AM Thread Starter
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OK, so more data.

85p (what they have now) - 1.02 cfm @ 30 psi / fill rate 31"x10.5" from 15 to 30 PSI2 min. 35 sec. (Ī05 sec.)

300p (~ same price as Smitty) - 1.62 cfm @ 30 psi / fill rate 31"x10.5" from 15 to 30 PSI2 min. 00 sec. (Ī 05 sec.)

440p (~$100 more as others) - 2.30 cfm @ 30 psi / fill rate 35″ X 12.5″ from 15 to 30 PSI2 min. 15 sec. (Ī 05 sec.)


Damn I wish Viair had an approximate fill rate on the 440p listed for a 31"x10.5" tire. It would make apples-to-apples comparison easier. Anyone want to take a swag based on the data we have?

Looking at the CFM #'s @ 30 psi I would have been tempted to claim the 300p would be 60% faster than the 85p, but the example at 31" tire doesn't bear that out. I mean it's a little faster, but not 60%. So I have no idea how to really compare the 440p for a 31" tire except to say that I'm sure it will be "faster still" but how much, I can't tell.

I left a message for the customer service team on the Viair site, hopefully they'll get back to me.

I kinda want to drop the Smittybuilt unit from the comparison unless I can get some real life data.

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post #5 of 36 Old 03-28-2018, 11:43 AM
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I have the smittybilt. It works fine but watch the duty cycle. When it overheats, it's down for a long time.

In my case, I tried it as OBA ( in the engine compartment) and it failed miserably. As designed, portable unit, as long as you don't exceed 15 minute run time, it will do the job.

I believe the CFM is at 0 PSI but it will go from 15 to 28 PSI on a 35" tire in about 2 minutes.

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post #6 of 36 Old 03-28-2018, 12:14 PM
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duty cycle is the more important really. i would be looking those that are continuous 100%. i had a few of those cheep red ones for a few years. one last a few year, one broke in 30 days when it spit a rod.< sounded so bad people though the pent tick blew up........ so i went to the 450p. been solid, no stopping 100% cycle duty. but on a 12+ i would not install these under the hood. its way to hot in there. i mounted mine under the pass seat. hard mounted.

as well not made in china, i would rather spend more than support china.

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post #7 of 36 Old 03-28-2018, 12:41 PM
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I may trust Smittybilt's compressor to fill up pool toys for the kids but not for refilling multiple big Jeep-size tires. And that 5.65 CFM Smittybilt claims is so misleading that it pisses me off. It can only put that much CFM (which is a huge amount) out into open air/0 psi resistance. Our lungs can put out that much CFM into air/0 psi resistance but they sure as hell can't put that into a tire. That size compressor is more likely to put out 1.5-2 CFM at the most. Only CFM ratings that include the PSI, like 30 psi, that CFM was rated at are believable.

And the above mentioned duty cycle is incredibly important when filling up multiple big Jeep-size tires. Years ago I used a friend's small cheap air compressor to fill my aired down tires and it took over an hour because the compressor kept shutting off for heat reasons. It was a very frustrating time, enough that I never used anything but high CFM sources after that. I installed a belt-driven York compressor-based OBA into my previous TJ which put out 6-8 CFM depending on engine RPM. That Jeep was stolen so I now use a CO2 tank which puts out probably 5 CFM.

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post #8 of 36 Old 03-28-2018, 01:54 PM
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Smittybilt used to sell a re-branded version of the MV50/MF1050 compressor, made by Q Industries. So I think they're just re-branding the MV90 one sold by Q Industries now. But that one only promotes 6400 (in3/min), which converts to 3.7cfm.

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post #9 of 36 Old 03-29-2018, 04:49 AM
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I have had the mv50 for years and it always works. Many people use it. For a cheap compressor it seems to be very reliable but it's not fast. I haven't really heard anything about the nv90 though. It is still cheaper compressor so I doubt it is as fast as other higher-end compressors. But I don't know for sure.

Yearsago I had CO2 and it was fast but I hated having to refill the bottles. I would rather wait longer for my tires to be aired up then take the time to go get the tanks filled or swapped.

There are people on this board who swear by the Puma compressors. You may want to do some searching and see what you can find out about those. But your best bet for constant fast air is to have a belt-driven system.

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post #10 of 36 Old 03-29-2018, 06:30 AM Thread Starter
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I appreciate all the responses.

Can someone explain the duty cycle data?

I see the following in the Viair specs:

85p: Duty Cycle: 20 min @ 30psi

300p & 440p: Duty Cycle: 33% @ 100 psi

450p: Duty Cycle: 100% @ 100 psi


I take the 85p to mean don't run it more than 20 min at a pop, yes?!?

What do the others mean comparatively?

Current Jeep: 2016 JKUS - My Mall/Beach/Dunes/Forest crawler - lightly modded
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post #11 of 36 Old 03-29-2018, 06:42 AM
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https://hornblasters.com/collections...air-compressor
I have a friend that has this one. A lot more money.
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post #12 of 36 Old 03-29-2018, 07:09 AM
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Quote:
Originally Posted by Kev M View Post
I appreciate all the responses.

Can someone explain the duty cycle data?

I see the following in the Viair specs:

85p: Duty Cycle: 20 min @ 30psi

300p & 440p: Duty Cycle: 33% @ 100 psi

450p: Duty Cycle: 100% @ 100 psi


I take the 85p to mean don't run it more than 20 min at a pop, yes?!?

What do the others mean comparatively?
Right, duty cycle is how long you can run at the rated PSI before you need to shut it off for usually an equal time. With a % rating, it's on 1/3rd of the time and off 2/3rds of the time.

For an actual time, you would have to ask Viair but my guess would be 10 minutes on, 20 minutes off.

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post #13 of 36 Old 03-29-2018, 08:06 AM Thread Starter
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Originally Posted by cranbiz View Post
Right, duty cycle is how long you can run at the rated PSI before you need to shut it off for usually an equal time. With a % rating, it's on 1/3rd of the time and off 2/3rds of the time.

For an actual time, you would have to ask Viair but my guess would be 10 minutes on, 20 minutes off.
I gotta imagine then even the 33% at 100 psi models would have no problem refilling OEM tires from 15 to 30 lickity split <---objective term really

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post #14 of 36 Old 03-29-2018, 08:40 AM
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Even at 3 minutes a tire, I would think it should easily be able to do all 4 within the duty cycle.

02 WJ Laredo, heavily optioned but stock
12 JK, 3.5" Teraflex/Franken lift, Bilstein 5100's, BFG KM3's 37x12.5/R17
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post #15 of 36 Old 03-29-2018, 08:46 AM Thread Starter
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Originally Posted by cranbiz View Post
Even at 3 minutes a tire, I would think it should easily be able to do all 4 within the duty cycle.
Supposedly (if you believe the web page) the 440p could do 35's in ~2 minutes.

Smaller OEMs should be like 1.5 each. No?

Current Jeep: 2016 JKUS - My Mall/Beach/Dunes/Forest crawler - lightly modded
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