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I use a paintball gun air cylinder with a tyre inflator fitting.
I can get the cylinder refilled at Dive shops for anything ranging from $5 to free, depending on the shop.
The cylinder can run at up to 4000 psi, thats right FOUR THOUSAND.
I can reseat and reinflate a tyre on a fully loaded Disco without taking the wheel off the car. Usually I just reseat the bead and an elcheapo 12 volt compressor can do the rest.
I found a returned air compressor at Supercheap Auto. $40 for parts only. 20Lt tank, pressure switch, etc.
Here it is! I've created a spreadsheet to do all the calculating rather than just posting equations.Quote:
Originally Posted by Pedro_The_Swift
It calculates the theoretical capacity and/or pressure required in an air tank to inflate tyres without additional assistance from a compressor.
I've set it up so that only the values that need to be altered, can be altered. The sheet is protected for this reason only. Feel free to unprotect it to see how it works.
I've also included it as an html file, but I suspect that it still requires Excel in the backgroud to drive it. (I can't test this because all of my computers have Excel installed)
Keep in mind that this is all based on theoretical ideals so will not be 100% accurate in practice. It should however be useful as a guide.
I would welcome feedback from anyone with some stats from their experiences so that I can refine it a bit more. Also, if you notice any errors let me know.
Hi Paul,Quote:
Originally Posted by awabbit6
Thanks for calculator!
The excel version works OK, HTML not on my PC. Says "To use this Web page interactively, you must have Microsoft® Internet Explorer 5.01 Service Pack 2 (SP2) or later and the Microsoft Office 2003 Web Components". I have WinXPSP2 and IE7.0 and MSOffice2007. Just FYI.
Could you please create another calculator to work out best air tank size if you know
1. Wheel size
2. Air compressor air flow (L/min)
3. Air tank top pressure (cutoff switch pressures)
4. Start/end tyre pressure
For example, I pump 4 tyres 265/75R16 from 20psi to 40psi faster with 7.5L air tank rather than direct. Bushranger air compressor, from memory 72L/min, pressure switch 75/100psi.
Cheers,
Ruslan
Should be able to. I'll have to include the time you want to be able to inflate the tyres in too.Quote:
Originally Posted by Ruslan
Give me 20mins .... LOL :Rolling:
... I'll work on it!
Mine did that too. Click on the yellow bar at the top of the page to activate it and it should work.Quote:
Originally Posted by Ruslan
yes, and calculate "ideal" time delay between tyres!Quote:
Originally Posted by awabbit6
1st tyre gest air from full tank
2nd, 3 and 4 start pressure depends how quick you jump from one tyre to another.
done that, but still no luckQuote:
Mine did that too. Click on the yellow bar at the top of the page to activate it and it should work.
I'm happy with excel version :)
P.S. What about air hose size? :D:D:D
Thanks Guys,
Thats a great deal of info posted. I only put the tank in because i was thinging of neumatic locks so a three ltr is ample for that. I may even jimmy around and become a "fixer" for a day and place the 3 ltr in line as well and put in a isolating valve somewhere.
May even go the old 12 ltr steel scuba tank and keep 300 bar of reserve under the car.
Oh and thanks for the calculator.
Cheers.
Snap
I have an arlec enforcers $38 18litre tank and my 9 litre fire extinguisher going under the tray of my ute. this with a check valve and some 1/4 turn valves for isolation will be handy to isolate one of the tanks the compressor will be wired to a switch on the dash and mounted under the passenger seat, so i can charge the tanks whilst driving and have the most available air ready for when i want to air up the tyres etc. Plus, with the 36 litres of air I should get some short bursts of the rattle gun for side of the road repairs.