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14 Sep 2001
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about AIRCON units as air compresors.
You shouldnt oil the compressor !!.People using "oil drips" on AIRCON units are inflating their tyres with oil-wet air , which can absolutely disastrous for rubber//tyres in mid-term.
Rubber and Oil doesnt mix very well!
IMHO , the AIRCON unit should not be oiled at all (it is neither oiled whist standard (air conditioning) operation , is it?)
BTW: This is a good reason NOT to inflate tyres with air which is suspected to come from worn air conmpressors(== air compressors with worn piston rings). Worn air compresors "nebulize" an incredible ammount of oil in the air .This , which is indeed a serious problem for car re-spraying ,and a fatal risk for scuba divers , can also damage seriously your flashy new tyres in a matter of months. If possible , choose an "oil-less" air compressor . (which have not oil in the crankCase , hence having the piston rings made from teflon).
In serious cases , one should use an air-line-oil-separator (about 20 UKP) which is standard piece of hardware for car -respraying
Cheers.
Javier .
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14 Sep 2001
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YES & NO !!!
The above explanation is completely true!
HOWEVER, when I was looking into this, it was suggested to install an air-oil seperator AFTER the compressor to remove the oil that was added to the air before the compressor. In that case you will have (more or less?) oil free air to inflate your tires.
I have not yet spoken to anybody who has actually done this but I believe this will work perfectly.
Regard, Jan.
p.s. I have finally bought an ARB compressor (originally made for air locks) but I have not tested it yet.
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14 Sep 2001
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Hi Sam, I wonder if air is thinner at 42C (well, it is a bit, but that much...?), because if I put 10 mins of Grand Erg on a tyre, even if it was totally flat, tha car would look like a monster truck.
I would expect the tyre pressures to rise up to 20% over 'true' cold pressures, so readings may not have been accurate (but they would have been proportional, I guess).
I agree with what you said elsewhere about sand plates, too.
Chris S
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18 Sep 2001
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Delighted to see the compressor forum is still going strong. I have just fitted a system to my Land Rover Carawagon. Son, Matt, ( www.mattsavage.co.uk) has imported a couple from the States to try out and I've got the first. At the risk of this looking like a blatent ad here's the spec:
Max Pressure 150psi. Duty Cycles 20%. Flow Rat @ 100psi - 0.85cfm. 12 volt 240 watt motor with direct drive to compressor. Price under £200 including air line and guage
<sales@mattsavage.co.uk>
I have done two acurate tests on the unit. To inflate 1 x 7.50x16 from 1 bar to 2.5 bar took 3 minutes and to do all four tyres took 13.5 minutes. I have now plumbed the compressor in to an old fire extinguisher to act as a res., but this has proved to be a waste of effort. The straight compressor with pipes is enough. Matt's got one more in stock and following a wave of publicity soon will have more. Oh. and I've just melted my seventh Halfords one.
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24 Sep 2001
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Air con compressors ARE oiled in their standard role and the oil level is important - as the compressors are running for long periods and pumping up to 300psi around the aircon system. For short periods and depending on the type of compressor you may get away with none. HOWEVER, if it were my truck I'd be inclined to oil the incoming air then install an oil seperator afterwards.
We have a (garage) oiled compressor which we use for spraying. It is fitted with an oil spearator and the air we get is DRY.
You could then have a valve to switch from dry air to oiled air for the tools. A regulator may also not be a bad idea - aircon is quite a bit too high a presure for airtools.
Marko
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25 Sep 2001
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There should`nt be a problem with putting in an inline oiler then drying it after the compressor. With a small tank you could also fit a small pressure switch so as it can build up pressure then cut out, as for running airtools, I dont like your chances as the compressor may have a lot of pressure but it just wouldnt be able to cope with the flow, with a decent sized tank you maybe able to run them intermittently but it would be anyoying stoping then starting
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An aussie escaped from london, now in Dubai.
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17 Apr 2002
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Just thought I'd drag this back to the surface...
Has anyone used the compressor sold by Matt Savage? (Apart from his Dad, Toby!!  )) Does it rate against the Grand Erg?
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17 Apr 2002
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Yes, I've used it in Morocco last year without any problems and I've just carried out a test on BFG 235.85.R16 At's.
Results (together with those found by Chris Scott above) are
Truck Air after 2 minutes reached 1.3 bar or 18 psi
Grand Erg after 2 minutes reached 2.5 bar or 35 psi (road pressure)
Matt Savage after 2 minutes reached 1.85 bar or 27 psi. (After 3 minutes it had reached 2.25 bar or 32 psi.) It took under 4 minutes to get to 2.5 bar or 35psi - road pressure.
Like Chris, I started with the tyre at 1 bar but it's colder up here in Northumberland :-)
Not as good as the Grand Erg, but smaller and considerably cheaper, and quicker than the TruckAir.
Yes it got warm - maybe slightly hot, but not so hot I couldn't touch it on the barrel or anywhere else.
I've got mine mounted under the driver's seat in my 110 (see my web site for picture http://www.a2b.uk.net/Mods.htm )
Finally I agree with the general thread here. Get one. It'll change your off-roading life.
Pete.
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Pete Sinclair.
Alnwick to Botswana
http://www.a2b.uk.net
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17 Apr 2002
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Thanks for that Pete - exactly what I needed. Sounds like the Matt Savage one is the one I'll go for. Did it require any special electrics or could an incompetent like myself manage to fit it?
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17 Apr 2002
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...incidentally, has anyone got any data on the Brownchurch one?
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17 Apr 2002
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Hi Ollie,
The electrics were very straightforward. I've hooked it up to my auxilliary battery with a biggish fuse - 15 amp I think. I've run this feed via a switch which I've screwed to the side of my cubby box.
All I have to do is open up under the seat, whip it out and inflate away. The compressor comes with a coiled hose long enough to reach all the wheels on my 110, and the spare on the back door. At a stretch it will just about reach the wheels on my trailer as well. The hose will also store under the seat, but comes with a 'quick disconnect' so you can stash it somewhere else if necessary, and plug it into the compressor when needed.
Pete.
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Pete Sinclair.
Alnwick to Botswana
http://www.a2b.uk.net
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18 Apr 2002
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Glad to see this thread is still thriving. Just back from a month in Libya. My Land Rover Carawagon and Kev White's Camel Trophy 110 Defender. Both fitted with 7.50x16 Mich XS's. We both had Matt Savge comps (Well I would wouldn't I!) Kev also had an ARB one that is also used to lock his diffs. I have an old fire extiquisher as a resevior. Turned out we were about equal on time to go from 1 bar to 2.5. Him with two comps, me with one and the extiquisher. Didn't do acuarate timings but it was about 15 minutes per vehicle. All of them performed faultlessly, but I wish I had plumbed in the air intake for the comp to my snorkel as the dust was flying. Didn't take a foot pump! Toby
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18 Apr 2002
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I picked up a twin tounge compressor from opposite lock in Australia for about £260, it is rated a 2.9 CFM compared to Matts at 1 CFM, and it is rated for comtinious used at pressures up to 50 PSI, I have bolted and hard wired it into my 110. It only takes around 1 minute to re-inflate 7.50x16s from 18 to 32 PSI but I will time it on the weekend for a more acurate time and post it next week.
Col Campbell
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19 Apr 2002
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To add to the exhaustive debate, I've fitted a Blue tonge II bought on the web for £160 from Oz delivered to the UK with bracket and hose which performed well on a recent trip to Algeria. Chris had his grand erg which was about twice as quick. I was a bit paranoid about getting my pressure back to the recomended rear 48psi for a 110 where as the TLC has lower pressures. As I see it (now I've let tyres down and reinflated many times in a day) buy the best you can afford (From about £150) and don't even concider one of the plastic types (even truck man which I've now dumped) if you want to let your tyres down deliberatly for traveling. I wasn't conviced by the expense before I went.
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19 Apr 2002
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Hi All
I used an ARB compressor that was wired for airring up and for the lockers fitted to a TLC80 that I had in SA, in fairly hot temps (40+C) in the Namib desert it airred all 4 tyres up but was a little slow, although I gave it a rest between tyres to be on the safe side.
I would say it was a good piece of kit but not really designed for airing up tyres.
cheers
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ChrisC
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