HOW BIG A TANK

Goto a truck wrecker and get the biggest one that will fit under your car.

Charlie, I have seen a 9kg gas bottle used as a tank for stored air if you have the room. This was on a L/C ute that does the winch challenge.
Just something to consider.
Regard's
Firey

Charlie.
There is a direct relationship with pressure and stored volume of air, so find out your maximum tank pressure and your tyre volume. Subtact 34 from your maximum pressure and then divide 34 into the result, this will give the ratio of tyre volume to tank volume. Eric.

Gday Charlie
dont forget what ever size tank you get to make sure it has a safty release valve, as for using a air conditioner pump for air i ahd amate who coyld not fit one under his bonnet so he mounted it on aboard in the back of his car & conected it to a starter moter to drive it solved the placement problem 7 seemed to work quite well
Regards bruceBudget Signs

Charlie I agonised over this matter of stored air in tanks and compressors. I have an ARB portable outfit now. After sand driving it takes me about 4-5 mins to reinflate my AT's from 15psi. I didn't think this was a big deal. I also am reluctant to add additional tanks under that can cause flotation problems in deep water, and as already mentioned you have to have fail safe safety valves that are protected from damage and dirt.
I now always carry one or two spares depending on the trip and inflate these to 75 psi (you may get more in some tyres but check with the supplier/manufacturer). I carry a length of air hose sufficient to go from the spares to each wheel, fitted with clip on attachments and an inline shutoff valve near one end. I also have a nozzle for blow jobs (keep it clean, you know what I mean) but you have to remove the valve and be quick with clipping on the hose. If I use any air I just top up the spares at the next servo or use my portable compressor. I called this the KISS method and so far it has served me well.
Cocka

Hi Charlie.

I have had 2 troopies a FJ45 and now a HZJ75 both fitted with A/C type compressors and air storage cylinders. Both were/are truck brake cylinders. The FJ was 1.5 CF capacity and now it is a 1 CF capacity.

Now my point and what is always forgotten to be mentioned when the subject of air storage and tyre inflation is raised.

The only benefit that you will get with a air cylinder storage unless it is a "HUMONGOUS" size is on the first tyre and or perhaps partway into the second tyre benefit as the stored air has now been expended.

The second thing here to consider now that the air pressure in the tyre and the cylinder are the same pressure and you now have to bring both the tyre and the cylinder up to the desired pressure as they are as one unit now, (extra volume) a catch 22 situation.

So you see the slight initial advantage that you may have gained in the beginning would now be working against you. I dare say if your storage cylinder was say 90 litres, which is totally out of the question, then the storage cylinder would do exactly what you want it to do.

Where the storage cylinder does stand out is if you have to use smaller air burst for some particular task, say to run a air drill or to a lesser degree a rattle gun.

Now you may ask, if the storage cylinder really is not all what it is cracked up to be then why do I have them fitted.

The answer is, by the time my compressed air goes though the initial primary small cylinder, (A 6inch boxed section of rectangular steel that houses the blow off valve and the drain cock and fitted into my front bumper) and then is piped back to the larger main cylinder mounted under the vehicle beside the gearbox and protected by the g/box bash plate, my air is cool and completely free of any oil that has a bad habit of also being pumped out with the air on any a.c type compressors.

Regards

Thanks for the reply Janset, that is certainly food for thought. Don't suppose you have heard of anyone putting a/c compressor in an 80 series GXL diesel?