Outer Limits 4x4 Board

How much air do I need to rebead a 35x13.5x15?
Will a 9L 140psi tank be enought?
What commpressor a typical ARB or convert the a/c?

i have reseated 38's with my arb and i only have a 5ltr (roughly) tank and that is at 100psi.. (or watever the arb switch is)

Thanks.
The ARB with the added 9l tank will just make it faster then and I get to keep the a/c for summer

Not sure how much pressure you need to rebead them. And do you want to just rebead them, or reinflate to road pressure too? Last tyres I rebeaded only needed about 7psi before they 'popped' onto the rim. I've never played with any tyres as big as yours though, so not sure if they'd need more, less or the same.

35"x13.5"x15" tyre holds 165 litres per atmosphere (slightly less as I don't know how thick the rubber is and its not a perfect disc shape, but it'll do).

Getting those tyres to 7psi will take 78 litres.
165 litres @ 7psi = 77 litres
9 litres @ 140 psi = 85.5 litres.

So you should have enough, depending on what pressure you want to take them to.

If you want to reinflate them from 17.5psi to 35psi you'll need 196 litres per tyre, which would involve 2.3 refills of the 9 litre tank to 140psi, per tyre.

Do you know the flow rate of your compressor?

Hav fun


(Remeber all this is in theory.....but in theory, communism works too)

can you convert that to cubic feet cf

1 litre = 0.0353146667 cu. ft. (approximately )

77 litres = 2.72 cu.ft.
85.5 litres = 3 cu.ft
196 litres = 6.9cu.ft

If you're compressor is capable of 70 lites per minute (2.5cu.ft) should take about 3 minutes to fill the 9 litre tank (in reality should take a little longer, but I'm not calculationg that! )

Close enough to 6.5 minutes per tyre.

It's hard to go past Air Up for quick and effecient tire inflation.

Check out www.air-up.com.au for more info.

It's not the speed of the compressor that reseats the bead - with the right technique and enough time any compressor that can inflate a tyre will reseat a bead.....it's all in the technique.....
But ofcourse it's nice if theres volumes of air to fill the danged thing up before xmas.....

Wooders wrote:It's not the speed of the compressor that reseats the bead - with the right technique and enough time any compressor that can inflate a tyre will reseat a bead.....it's all in the technique.....
But ofcourse it's nice if theres volumes of air to fill the danged thing up before xmas.....

Exactly right - if you have a good seal to start with, you have the game half won. Depending on the size of the tyre and you experience [or luck], you can hold it in the right spot and it will seal up quickly and pop the bead back on as soon as the pressure reaches the right amount. I have even seen some people use a ratchet strap in order to hold the tyre close to the bead for a better seal [until the air pressure built up is enough to take over]. A liberal dose of WD around the lip of the tyre helps. I don’t know how much volume of air this would be [see spimon's post], again it would depend on the size of the tyre and definitely be a factor of how much escapes before a semi-permanent seal is established. I have seen this done with a standard ARB compressor on a 35” tyre [although it took a while 7-10 minutes at a guess – it was a good chance for a breather for your mates].
For me, I hate waiting to air up so I have both onboard air and an air-up system. It all depends on how often you air up, how far away you are from 240V or 415V compressors and how much spare cash you have after the bills, shopping, filling up the car mortgage/rent etc. as to how much you spend on portable air systems.

Cheers

That AIR-UP system is one expensive fir extinguisher a CO2 type extinguisher is rated at 300psi. The tank I will be using is a water/foam type working pressure 1120kpa, periodic test pressure 2.5Mpa. I'm using a water/foam because they are stainless steel.
I though from watching them at the tyre shop beading a tyre you needed a large volume of air to bead a tyre as they take the valve out and hit it with air untill it pops on. It never takes long.
I guess what I will do is run the ARB into the tank and see how I go if it takes to long I will convert the a/c pump into an air commpressor. Less time eF'in around with tyres more time wheeling
Thanks for your input

CO2 cylinders are rated to 3000psi. When running CO2 throught a regulator the vapour reaches a temp of -40deg c, most regs will freeze.
The air-up reg is designed to handle all the extrems that you can throw at them. Designs like these are not cheep.
Hope that helps

Dave

How can the cylinder hold 3000psi when the fittings are rated at 200psi for the hose and 300psi for the brass fittings.
And i'm sure they have a CO2 fire extinguisher that does'nt freeze up when you are using it.

Just wrap your winch cable around the middle of the tyre and pull it in firm and any compressor will do

Thanks or I could pay $1000 to fill 148 tyres from 15psi to 36psi thats $1000 for 37 runs what a bargin

Spray some carby cleaner in side the rim and light it up

that carby cleaner is good stuff a mate sprayed some in his eye and now hes got clean eyes