picking out right air compressor

jorbill2or wrote:

Trackrig wrote:
Having watched the videos that Bshpilot provided the link to, why does the MH in the first video bleed off air when the brakes aren't being used?

Bill

because air from the tank goes to the tire or the other way tire to tank and they equalize . the compressor only comes on if below 90psi and the tire needed over 100 lbs so no compressor and the tire (over 100psi) bled pressure back to the tank. Thus you need to get the pressure below 90 then start filling after the compressor comes on

I should have said while he's not using the brakes and not airing up the tires..

When he is in the cab showing the factory air gauge and his air gauge on the end of the air hose, using the video timer, at 8:28 he has full air pressure of 125psi. At 8:37 he states it's normal for the air system to fluctuate up and down. At 8:40 his air is down to 115psi and at 9:05 it's down to 112psi when the camera is removed from the two air gauges. Unless he's gone outside and done something using air pressure and didn't film it, or edited it out, his air system is loosing air pressure while he's just sitting there filming. Or, did I miss something?

When he says it's normal for the air pressure to fluctuate - I'm assuming he means while the MH is just sitting there idling and no one is playing with the brakes, does his system have a leak or that's what his brand of MH does? The reason I ask the question, is my MH will drop to about 60psi after sitting for a week, nothing like how fast his looses pressure.

Bill

I have a 150 psi compressor in my basement storage as I use it for more than just airing the motorhome tires. Much nicer to just run the generator than having to start the coach. Buy quality as I have tried Harbor Freight, Kobalt, and Campbell Hausfield and you definitely get what you pay for. I am currently trying to easily mount a separate air tank so I can fill it and use it for blowing off the table, or my pants, or my shoes, etc....

Executive wrote:
Your on board one will be more than sufficient for airing up your tires...save your money for more important things....Dennis

Like you I use my paid for compressor to air my front tires to 110. His time must be very valuable as I could add 5 psi in about a minute once the air got up to 105 with the engine at 1200 rpms. Even it it cut out at 120 there was enough time before it dropped to 110 to top off the tire. OH wait, two tires so two minutes.
OP you are going to need a good 3/8" or larger air line and a good chuck so I'd buy that first and give it another try and as Dennis would say "just saying":B

Trackrig wrote:
Having watched the videos that Bshpilot provided the link to, why does the MH in the first video bleed off air when the brakes aren't being used?

Bill

because air from the tank goes to the tire or the other way tire to tank and they equalize . the compressor only comes on if below 90psi and the tire needed over 100 lbs so no compressor and the tire (over 100psi) bled pressure back to the tank. Thus you need to get the pressure below 90 then start filling after the compressor comes on

6string wrote:
I want to buy anew air compressor that will air up my tires on my phaeton motorhome. I usually run them at 110 psi. Will a 150 psi compressor be big enough?

I have a 150psi compressor and it works for me, but I usually run my tires at about 95 psi. You probably know that the compressor doesn't maintain 150 psi. Per the gauge mine only goes up to about 145 before the compressor motor turns off. I haven't checked it recently, but it probably drops down in the 120 range before the motor comes back on. So if you're trying to inflate to 110 and the pressure goes down to 120 before the motor comes back on it may be slow going toward the end. One way to get around that is just release air from the compressor until the motor kicks back on and let it get back up to over 140 and then try inflating again.

Having watched the videos that Bshpilot provided the link to, why does the MH in the first video bleed off air when the brakes aren't being used?

Bill

these videos may help you leverage your on-board air compressor for filling tires.

Video 1: HOW TO: Inflate High Pressure RV Tires

Video 2: UPDATE: High Pressure RV Tire Inflation

how often are you needing to add air ??? once a year ? twice ?

if you're having to CHECK your tire pressure (which you should) frequently why not install a tire pressure & temperature monitoring system ? Since i installed my TST system i never (have) to check my pressure (i just turn on the monitor)....no more hauling out air line or gauges, only to discover that i don't even NEED any air.

A small 110 (or even 12v) compressor won't be fast either. If you want FAST (quiet) fill ups/top-offs use a Co2 Tank....you can exchange the tank for about 14 bucks when it gets empty or low.

Co2 systems from Smitty Built & PowerTank can not be exchanged, will age out & need to be repurchased every 5 years or so.

a 150-175psi Co2 regulator will run you 50-70 bucks can support several dozen tire fill ups.

I do know but it only goes up to about 120 psi. I have used it before but it takes a long time to add even 10 psi so I'm going to buy one that will do the job. Thanks for all of your Replies.

Executive wrote:
Your on board one will be more than sufficient for airing up your tires...save your money for more important things....Dennis

He doesn't know he has an on-board compressor??