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Re: Tire Pressure and free weigh-in

Reply #125 –
Yahoo Message Number: 65285
If you are in Oregon and see a "closed" truck weigh station pull in and weigh for free. Oregon leaves the scales on. What about other states? Anyone know?

Jim
10613

Tire Pressure

Reply #126 –
Yahoo Message Number: 70258
Question?

If a tire is inflated to, let's say, 100 pounds at sea level will the pressure increase as the tire moves to higher elevations with the ambient temperature being the same 65 degrees at both locations?

Walt

2004 Country Coach

Re: Tire Pressure

Reply #128 –
Yahoo Message Number: 70262
If you read the article you cited, you'll find the answer to Walt's question is yes. "Those (tires) measured at the 5,000-foot level (where an atmospheric pressure of only 12.2 pounds per square inch (vs. 14.7 at sea level) is the ambient pressure) would indicate about 2-3 psi higher than at sea level."

Nate Richards
04 Allure 31043

Re: Tire Pressure

Reply #129 –
Yahoo Message Number: 70263
And, if you are visiting the higher altitude, don't fiddle with the PSI, 2-3 PSI is negligible (unless you are now in excess if your maximum wheel rim limit). Just leave it been, as your pressure will return to the same pressure before you went to altitude, when you drop to lower elevation.

Lee
--

Lee Zaborowski

07 Intrigue 12153, Cat C-13

Tire Pressure

Reply #130 –
Yahoo Message Number: 84718
I have seen posts that talks about tire pressure, what frustrates me is I run the coach down the road to add air and find that the tires are already warm and will not take the required air. Someof you have talked about a unit that does not take a week to reach a 120 lbs, What do you do?? Vic 03 Magna 6253

Re: Tire Pressure

Reply #131 –
Yahoo Message Number: 84725
I use a Husky 200 psi compressor which is quieter and faster than most others I have seen. In the interim, check tires cold, note psi needed for each tire, then add that amount to each tire when they are warm. May not be exact, but close enough.

Larry, 03 Allure, 30856 30856

Re: Tire Pressure

Reply #132 –
Yahoo Message Number: 84728
Hi Vic,

For home duty, I use a Porter Cable pancake 150 PSI. For on the road I bought from a fellow CC owner that was retiring from the road, his Bob Dickman Air Doubler along with the coaches air supply.
http://www.dickmantires.com/air_pressure/air_pressure_info_instructions.html
I also agree that you can do the before start PSI check, and just plus the amount you are low when getting to the air supply.
If you have not done so, do get a four corner weight when ready to travel (full tank fuel, water, loaded for travel). Then look up your tire manufacturers PSI setting for the weight. Do this per axle, using the highest weight as the decision point. I also look at this weight, and if close to mid level or above on the chart range, take the next higher weight point's PSI. While I know that the tire manufacturers have safety cushions in this PSI amount, I also add 5 more PSI for my own contigency. Load shifts for going around corners, strong winds coming from the side, etc. all can add to the weight that the tires are carrying. Thus the 5 PSI setting cushion I choose to use.
For my coach, this is still 15PSI lower then the CC PSI setting level for the rear and tag, and 10PSI lower for the fronts.

Best of luck, be safe, and have fun, Smitty

04 Allure 40' with Tag, 31017
04 Allure Sold to a nice new owner! Now enjoying a 07 Magna Rembrandt 45' ISX600 #6775
"We're ONDROAD for THEJRNY!" (Toad and Coach license plates, say Hi if you see us!)

Re: Tire Pressure

Reply #133 –
Yahoo Message Number: 84730
Vic

You are going to continue to be frustrated until you have your own on board air solution. I use the Dickman Tire air doubler. It is not cheap, but it is compact and I have plumbed it into the compartment where the compressor is located. In my coach it is under the driver's seat and very convenient.
It is not fast but certainly adequate when you are only adding a few pounds.

Dan 2006 Allure 31348

Re: Tire Pressure

Reply #134 –
Yahoo Message Number: 84735
Viair 400P-RV Automatic

http://www.viaircorp.com/Industrial/400PA-RV.html it gets the job done... not cheap but if you need 115 psi or so, you cannot use an ordinary tire inflation tool. and if you run your tires 20% underinflated for long, you have ruined them. I tried a 110 AC compressor first supposedly capable to 120 psi. tT could not do the job. The 12v Viair is neat because you can clip it on and walk away... and it has an inline gauge so you can keep an eye on it from a distance. As for the difference between cold and hot I have read the difference can be as much as 5-10 psi difference depending on the temperature differences. Bear in mind outside ambient temperature and elevation also make a difference. There's no substitute to having an accurate and reliable onboard air compressor for your expensive RV tires - my latest set of Michelin XZA-2's cost me $800+ *8. Gotta take good care of them

Joseph Burkle

2008 Country Coach Inspire 360 Founders Edition 43' quad slide tag axle 425 HP C9 pusher http://www. Wind-seeker.com/

Re: Tire Pressure

Reply #135 –
Yahoo Message Number: 84736
Vic I have had the Outback air system for several years. Great for topping pressure to 120. You can have it filled at any beer tap supply or fire extingisher shop. Lasts me almost a year.
http://www.outbackequipped.com Ned Herrmann
06 Inspire 51677

Tire Pressure

Reply #136 –
Yahoo Message Number: 86707
How often should I check my tire pressure? I've been sitting for a while and will be traveling for a month. What's some thoughts on buying a good portable air compressor, like some they have at lowe's? Thanks, John 03 Allure 30951

Re: Tire Pressure

Reply #137 –
Yahoo Message Number: 86708
John - My BS on tire inflation, temperature and pressure is here: http://www.muniac.com/ubbthreads/ubbthreads.php?ubb=showflat&Number=177#Post177 It's work in progress and I'm due to take some readings when we get rolling in a month or so. Our Michelin XZA2 tires hold air very well. We sit for up to 6 months and they don't lose any appreciable air. That said, checking air pressure is always a good idea. Better to check it more often than not often enough. Unlike bicycle tires that have a small volume of air, checking doesn't appreciably change the pressure. You'll release a small puff of air from the tire when the tire chuck goes on/off the stem. Not even a consideration for a BIG bus tire.

My inflation method is documented in the article. Hope it helps.

Re: Tire Pressure

Reply #138 –
Yahoo Message Number: 86709
I would purchase a good tire monitoring system, I bought a tire tracker system, then I would purchase a air hose long enough to service all the tires, attach a good PSI gauge to the end, with air fitting plug It in to the coupler in the front drivers side bay, and as you run the engine depress the brake pedal numerous times until the pressure goes down to about 50psi. then you can attach gauge to valve stem and watch pressure on gauge rise to desired PSI. Works great no need for extra compressor. Cost about $30 Jim

2006 Allure 430 #31317
 

Re: Tire Pressure

Reply #140 –
Yahoo Message Number: 86754
I find our 12R Michelins XZE* tires lose PSI slowly. I check ours at the start of each trip with the gauge, then cross reference with the Smart Tire readings as soon as they send out a signal, within a few hundred yards. Pretty close, within 3 PSI, except the right inside drive is off by 4 PSI.
I visually inspect the coach, toad, all tires at each stop. And use infrared temp sensor at each fuel fill up.
I do a manual tire gauge check once a week, usually OK. I also try to factor temp and altitude.
Though slow, your onboard compressor system might cover you. Running the engine seems to help, vs just the electric. I bought a used air doubler, but have not yet used it. Smaller then another air compressor.

Good luck as you learn how your tires PSI changes for you.
Smitty

04 Allure 31017
04 Allure Sold to a nice new owner! Now enjoying a 07 Magna Rembrandt 45' ISX600 #6775
"We're ONDROAD for THEJRNY!" (Toad and Coach license plates, say Hi if you see us!)