Harbor Freight Air Compressors

[FLTom52]

I was looking at duty cycle vs cfm between the 400p and the 450p. Since there is little price difference I was confused about what to buy. I just spoke to Ryan at Viair and he recommended the 400p for 5th wheel use as it will fill the tires more quickly and typically not bump up against duty cycle. The 400p produces more CFM.

I just found another review that says pretty much the same thing:

https://rvtofreedom.com/viair-400p-r...ressor-review/

So now to find the best price on a 400P-RV. Any suggestions?

Well for several months I’ve been reading about how the 450p-RV was the best for trucks and RV’s. And I was going to buy soon. So now I need to rethink this.


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[Keebler]

Perhaps I am misreading the specs on VIAIR's page. https://www.viaircorp.com/rvs-portables/450p-rvs The fill rate on the 450 looks faster to me. At least for the larger tire; negligible difference on smaller.

The tables that list "RV TIRE FILL RATES" show the following:

For the 450P-RVS:
33″ RV TIRE (245/70R19.5): 90 to 110 PSI - 1 min. 59 sec. (±05 sec.)
37″ RV TIRE (255/70R22.5): 90 to 110 PSI - 2 min. 15 sec. (±10 sec.)

For the 400P-RVS:
33″ RV TIRE (245/70R19.5): 90 to 110 PSI - 1 min. 55 sec. (± 05 sec.)
37″ RV TIRE (255/70R22.5): 90 to 110 PSI - 3 min. 25 sec. (± 10 sec.)

[FLTom52]

Perhaps I am misreading the specs on VIAIR's page. https://www.viaircorp.com/rvs-portables/450p-rvs The fill rate on the 450 looks faster to me. At least for the larger tire; negligible difference on smaller.

The tables that list "RV TIRE FILL RATES" show the following:

For the 450P-RVS:
33″ RV TIRE (245/70R19.5): 90 to 110 PSI - 1 min. 59 sec. (±05 sec.)
37″ RV TIRE (255/70R22.5): 90 to 110 PSI - 2 min. 15 sec. (±10 sec.)

For the 400P-RVS:
33″ RV TIRE (245/70R19.5): 90 to 110 PSI - 1 min. 55 sec. (± 05 sec.)
37″ RV TIRE (255/70R22.5): 90 to 110 PSI - 3 min. 25 sec. (± 10 sec.)

So this IS confusing ? And to add another wrinkle, there is a 400pA-RV model out there that is more expensive than both? wonder what the A does to the package?


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[gbkims]

Marketing seems to be the thing for the -RVS models.
"VIAIR’s four RVS Tire Inflator models are exclusive for authorized RV Dealers, to be sold in their brick & mortar retail locations."

400P-RV 30 amps, more CFM for a 33% duty cycle than the 450P-RV 23 amps, 100% duty cycle.

400P-RV P/N 40047 Automatic Compressor, Duty Cycle: 33% @ 100 PSI, Max. Working Pressure: 150 PSI, Max. Amp Draw: 30 Amps, 80 PSI 1.37 CFM, 110 PSI 1.11 CFM
450P-RV P/N 45053 Automatic Compressor, Duty Cycle: 100% @ 100 PSI, Max. Working Pressure: 150 PSI, Max. Amp Draw: 23 Amps, 80 PSI 1.04 CFM, 110 PSI 0.90 CFM

[Country Campers]

All this tire pumping reminds me of a joke that can not be told here.

So should we shy away from the RV ones?

Brian

[FLTom52]

Does anyone know if the Viair 450p-RV or the Viair 400p-RV can directly plug into the 12v or do they have to be connected directly to the battery with alligator clips?


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[FT4NOW]

Does anyone know if the Viair 450p-RV or the Viair 400p-RV can directly plug into the 12v or do they have to be connected directly to the battery with alligator clips?


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I would say no as they have a max load of 23A and 30A respectively. I don't think any of the 12V outlets that come standard on a vehicle are rated that high which is why the Viair's come with alligator clips and the instructions direct you to hook it to the battery.

[slauretani]

We just purchased the 400-rv viair and it’s battery clips only. Love the unit.

[FLTom52]

We just purchased the 400-rv viair and it’s battery clips only. Love the unit.

So after all this thread and thanks for all the advice btw, I purchased the 400p-rv. I decided that I wanted the Viair that could fill up faster was more important for me even though it had less duty time.

Now my next question— perhaps overthinking— but since I have to connect with the clips to a battery, does it matter on my F350 which battery I use— the battery on drivers side or the battery on passenger side? Or doesn’t matter?


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[acadiaforever]

Now my next question— perhaps overthinking— but since I have to connect with the clips to a battery, does it matter on my F350 which battery I use— the battery on drivers side or the battery on passenger side? Or doesn’t matter?


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It doesn't matter. Before I set it up in my trailer's battery compartment more or less permanently, I used both batteries, choosing more or less randomly which one to use for a particular filling.
-Al