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Topic: airing 22.5 inch motorhome tires

Posted By: Jest4fun on 12/03/09 06:38pm

What size cfm aircompressor at 90 psi or above is needed to air 22.5 class A motorhome tires? Would a pancake style aircompressor with a 2.6 cfm handle this job?


Ken and Pat Piepho
Winston the dog, Macapoo, the cockatoo, and Cuddles & Coco the cats


Posted By: Tom/Barb on 12/03/09 06:43pm

Yes, but it will take a while, but many compressors areset at 125 PSI shut off pressure.

Does your unit have air ride? If so tap a connection into that system run your engine while you fill your tires.

Some coach air ride systems are 200 PSI, be-careful.


2000 Newmar mountain aire 4081 DP, ISC/350 Allison 6 speed, Wrangler JK toad.


Posted By: Norm Payne on 12/03/09 07:20pm

My pancake air compressor is rated 2.0 CFM at 90 psi and it has a maximun pressure of 135 psi. I have inflated many tires for myself and friends and it does a good job. I have never filled a completely flat tire, but going from 100 psi to 110 psi takes about 1-1.5 minutes.


Norm
2005 Dutch Star 4015, Cummins ISL 370 hp
2007 Honda CR-V
See Ya Down The Road
http://www.seeya-downtheroad.com


Posted By: Golden_HVAC on 12/03/09 07:13pm

Hi,

The problem with most air compressors is they rate them at so many CFM at 10 PSI, and then say the maximum pressure is 90 or 125 PSI, and do not normally give the CFM at 100 PSI is only 1 CFM or less.

I bought a 1/2 HP compressor at Sears, it has a small tank, and fits into my basement compartment. I plug it in, when it shuts off at 125 PSI, then I can air up my tires to about 90 PSI in a few minutes. But if you need to reach 110 PSI, it might take all night. You can only top off the tires while the compressor is running and above 120 PSI.

I re-set the pressure switch up to about 130 PSI, so it comes on at 120 and off at 130 PSI. This gives me a little faster fill.

You can also check your forward streetside storage compartment, and see if there are any air fittings in there? Sometimes the main air tank (If you have air brakes) has a fitting, that can be tapped to fill the tires. You would need to run the engine, and then you should be getting 16 CFM @ about 125 PSI.

Good Luck,

Fred.


Posted By: ernestfortier on 12/03/09 06:59pm

2.6 CFM at 90 lbs is almost nothing. It would take at least 6CFM at 90psi to fill those tires in a decent amount of time.


Ernie Fortier
99 Bounder 34V
2 honda 2K paralled (for economy)
5.5 Onan onboard
96 Geo Tracker 4x4 Auto. convertable


Posted By: Tom/Barb on 12/03/09 06:46pm

Yes, but it will take a while, but many compressors areset at 125 PSI shut off pressure.

Does your unit have air ride? If so tap a connection into that system run your engine while you fill your tires.

Some coach air ride systems are 200 PSI, be-careful.


Posted By: Deen on 12/03/09 09:37pm

I have a Coleman 120 V tank unit that goes to 150 psi. I need 120 psi in my front tires so I can't use the onboard air as it goes to 120 and no higher. I tried using the onboard air but it just was taking way too long.


Posted By: PackerBacker on 12/03/09 07:28pm

My Craftsman 4-gallon 2-HP compressor maxes at 150 psi and it resets at 125 psi. It works fine for topping off my 95 psi tires.


Eric
2014 Enterra 314RES (Cruiser RV) TT, Equal-i-zer 12K, Honda 2000 Genny
2014 Ram 1500 Quad Short Bed, 5.7L Hemi, 8 speed auto, 4x4, Line-X
FQCC/Camping Quebec, KOA, Good Sam


Posted By: Sully2 on 12/04/09 06:34am

AZPops wrote:

First off, Welcome to the Forums!!!

One alternative and best product I’ve purchase to fill my tires. It’s quiet (can fill your tires at anytime of the night and not disturb your neighbors), taking only seconds to top off your tires.

Power Tank

Good luck,

Pops


And it costs from $350 to $550 dollars. Are you kidding me!???


2000 Country Coach Allure; Cummins ISC 330 HP; 71/2 - 8 MPG regardless
2002 Jeep Liberty



Posted By: Locomotiveman on 12/03/09 09:58pm

Jest4fun, Something like a 6Gallon Porter-Cable C2002-WK ? 2.5scfm @90lbs. ? It WILL go to 150psi. Trouble with 120v motors is 2hp is about max. It will get the job done, but the last 20lbs will be hot and slow. For $160bucks or so you'll get by OK. ps Buy a crowsfoot inflater chuck and a Made in USA guage. Locomotiveman


Locomotiveman..Yes I am a career cross-country Locomotive Engineer. Wife is an RN. We are CLOSE to retiring and 'downsized' to a Monaco Executive w/450hp Cummins and nice drapes. Locomotiveman


Posted By: LLT on 12/03/09 09:58pm

I use a large compressor at home, but on the road, I tap the on-board air system. It inflates the rears to 105 just fine. 110 in the front takes a purge cycle and a few minutes of time, but it will get the job done just fine.


2007 Newmar Mountain Aire 4528
2007 Chevy Silverado LTZ Crew Cb



Posted By: AZPops on 12/04/09 03:19am

First off, Welcome to the Forums!!!

One alternative and best product I’ve purchase to fill my tires. It’s quiet (can fill your tires at anytime of the night and not disturb your neighbors), taking only seconds to top off your tires.

Power Tank

Good luck,

Pops


Posted By: Briteskys on 12/03/09 09:01pm

I carry this DeWalt compressor as it handles 22.5 tires with ease.
Its rated 4.5 CFM @ 100 lbs so it can quickly fill to 110 -115#.
Nice for other jobs around both the home & motorhome.


'02 Beaver Patriot Thunder
Jeep Grand Cherokee
Ron & Jane's Travels



Posted By: david-derita on 12/04/09 03:07am

I have a 3 gallon 125 psi air compressor from Sears that I use to air up my tires @ 105 psi, which it does with no problem. When purchased the compressor would shut off @ 120 psi, but I changed that to 125 psi. It is a compact unit that fits easily in a basement bay. The best part of it is that I only paid $99 for it.


Posted By: mscamping on 12/04/09 08:29am

When at the house I use a Coleman 135# compressor turned up to 115#.. On the road I carry 40' of air hose and use the moho air supply..
Mike..

* This post was edited 12/07/09 11:45am by mscamping *


2003 Holiday Rambler Neptune 36 PBD - ISB 300 Cummins- Allison MH2000 5 speed
2013 Equinox w/Blue Ox Aventa II & SMI Stay-n-Play Duo
FMCA 331658 HRRVC 105155 Chapter - 57- Good Sam Life Member - Coach Net - 3/4 timers
Mike & Sharon


Posted By: deandec on 12/04/09 10:44am

You do not state what air pressure you are trying to achieve.

My onboard system will take my front tires to about 107#.

I acquired a sears (Porter Cable) 150 psi 6 gallon compressor that will quickly fill the tires to a required 115 PSI.

That PC compressor will fit in my MH basement but I will only carry it on really long excursions.


Dean
95 CC Magna, Jeep GC



Posted By: Jest4fun on 12/04/09 12:08pm

We do not have a on board air system, we have a winnebago adventurer, Thanks for all the good advise, we will check out the different compressors.


Posted By: Jim@HiTek on 12/06/09 07:11pm

shadow65 wrote:

Where can you get tires aired while on the road? Do truck stops have compressors that will air your tires to 110 psi?


You might be surprised at how difficult it is to find a place...even truck stops...that have WORKING air systems. Can't tell you the number of times I've had to move on to another station (all truck stops) trying to find somewhere that could just get my tires up to 100#! For example, many of the Flying J RV areas only go up to 80#, then you move over to the diesel truckers side and after waiting in line for 20 minutes, find that the air hose assembly is broken or not working and all other slots are full with semi trucks. Same with so many truck stops I stopped counting.

Finally, I gave up and bought a $75 tank free inflater rated at 300psi. I've never had to fill an empty tire but going from 85# to 100# took around 3 minutes. The box says a fill of a 16" tire to 80# shouldn't take more then 8 minutes. Can't remember the name but if anyone cares, I'll go grab the box. Runs on 12V but that hasn't been a problem since it has a long 12V cord and I added 8 foot of air hose so I can reach the duallys. It's nice and quiet too, I think anyway.


Jim@HiTek
Have shop, will travel!
Visit my travel & RV repair blog site. Subscribe for emailed updates.
Fleetwood Bounder, '94
Cummins Diesel, 190HP, 36.5' with 50HP LP boost.
Black Rock Lava Park, Nevada



Posted By: virginiarebel on 12/07/09 05:44pm

Livin Good wrote:

Too pricey for us regular guys....


I'll second that. The unit may be worth the price, but a ridulous price to air up your RV tires.


2002 36' Monaco La Palma DBD Ford V-10
2 slides, 2 sinks, 2 potties
Toad - 2001 Saturn SL2 w/Sunroof/CD/Cassette
Falcon All Terrain Hitch & US Gear Toad Brake



Posted By: AZPops on 12/06/09 07:26pm

DDinCincy wrote:

I'll second the PowerTank system! Absolutely the best out there for high-pressure needs. Yes, it is expensive, but so are many things that lead their class.


Thanks DDinCincy!

For though's interested or curious, here's a link to my thread I started when I wrote a review of the PowerTank.

Link

Pops


Posted By: AZPops on 12/06/09 12:46pm

Sully2 wrote:

AZPops wrote:

First off, Welcome to the Forums!!!

One alternative and best product I’ve purchase to fill my tires. It’s quiet (can fill your tires at anytime of the night and not disturb your neighbors), taking only seconds to top off your tires.

Power Tank

Good luck,

Pops


And it costs from $350 to $550 dollars. Are you kidding me!???


No I'm not, there are more then a few members in this forum as well the American Coach Yahoo group that purchased and are using this product. A few members have more then one PowerTank, who are into racing and other like activities.

This was how I first learned about this product (through members in this forum).

Anyway, this was only a suggestion...

Pops


Posted By: DDinCincy on 12/06/09 06:47pm

I'll second the PowerTank system! Absolutely the best out there for high-pressure needs. Yes, it is expensive, but so are many things that lead their class.


Posted By: UltraKen on 12/04/09 07:02am

david-derita wrote:

I have a 3 gallon 125 psi air compressor from Sears that I use to air up my tires @ 105 psi, which it does with no problem. When purchased the compressor would shut off @ 120 psi, but I changed that to 125 psi. It is a compact unit that fits easily in a basement bay. The best part of it is that I only paid $99 for it.


How do you change the shut-off pressure?


UltraKen
Ex - 1968 Ultra Van
NOW - 1996 Safari Sahara 35' - Model 3530 - Cat 300
Pictures of my Coach
A $93 Rear Camera System
My take on replacing tires
Used MH Checklist
Toad: Dodge Grand Caravan on Tow Dolly or 1981 Vespa on utility trailer



Posted By: TZScales on 12/04/09 07:18am

If possible, make sure you weigh each axle end to ensure you know what weight you are dealing with. There should be a weight table for your brand of tire, look at it to find the correct psi number based on the highest weight number i.e. the psi number should be exactly the same in the front for both tires or in the rear for the duals. In addition, you do not want to exceed the weight rating of the axle.


TZS and Wife
2007 Monaco Executive Sandia IV
Cummins ISX 525 Horsepower
Allison 4000 Six Speed Transmission
Roadmaster S-Series Chassis
2006 Saturn Vue
SMI Air Force One


Posted By: Livin Good on 12/06/09 12:12pm

AZPops wrote:

First off, Welcome to the Forums!!!

One alternative and best product I’ve purchase to fill my tires. It’s quiet (can fill your tires at anytime of the night and not disturb your neighbors), taking only seconds to top off your tires.

Power Tank

Good luck,

Pops


No thank you, $350 bucks to air a tire quietly and beside that, you have to find a welding gas supply house to refill the canister. I can waste my money elsewhere.....

* This post was edited 12/06/09 12:28pm by Livin Good *


Posted By: Livin Good on 12/07/09 02:27pm

Too pricey for us regular guys....


Posted By: shadow65 on 12/05/09 12:24pm

Where can you get tires aired while on the road? Do truck stops have compressors that will air your tires to 110 psi?


2007 Winnebago Journey 34'
2006 Honda Element Toad


Posted By: tcitruck on 12/04/09 07:06am

If you look at some old posts, I think the comments were leaning towards the type of compressor "without" a tank. It was a direct filling system. If I remember correctly, they were "inflators" instead of compressors. They are 120v, 150# max for under $100.00.

The theory being that the tank would have to be too big to carry around to fill to the required pressure.


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