Onboard CO2; Poll about tank size.

[mrk5]

I'm looking to make my own CO2 setup. I'm wondering what size tank to get. I'm only going to use it for tires, no air tools. I have 33s on 15s. I usually wheel with my father (31s on 15s) and my brother-in-law (35s on 16s). We all usually only air down to about 18-20lbs, and we rarely do more than one trail in a weekend. So what size do you all think would be best?

 

[AgDieseler]

10 & 15 lb tanks fit into a standard fire extinguisher holder while the 20 lb tank is larger in diameter and has fewer mounting options. I have a 15 lb tank and filled about 30 of my 35s from 10-40 psi.

 

[k5freak44]

Im the first naked one! /forums/images/graemlins/waytogo.gif

 

[boggerless]

WOW, then one of my 72lb scuba tanks should last alooong time.what do you guys use for the top of the tank?i don't think converting a scuba regulater would work cuz it.s low pressure for breathing? /forums/images/graemlins/k5.gifto /forums/images/graemlins/truck.gif

 

[mrk5]

[ QUOTE ]
I have a 15 lb tank and filled about 30 of my 35s from 10-40 psi.

[/ QUOTE ]

/forums/images/graemlins/yikes.gif That's a lot. I didn't realize even a 15 lb would last that long.

 

[85mudblazin]

Yea co2 last along time, I made my own and it is out of a 10lb tank with a welding regulator but he regulator doesnt put out enough air to air up tires fast so I think I might look into getting another regulator and just switch them out when I want to weld. I made my own tank mount you can see it in my webshots folder thats in my sig.
-Chris

 

[mcinfantry]

[ QUOTE ]
WOW, then one of my 72lb scuba tanks should last alooong time.what do you guys use for the top of the tank?i don't think converting a scuba regulater would work cuz it.s low pressure for breathing? /forums/images/graemlins/k5.gifto /forums/images/graemlins/truck.gif

[/ QUOTE ]

co2 is 20lb liquid
diving air is just that, gas. less "air" in an air tank

20lb co2 is enough for me to fill 38x11 tires from 10~60psi twice

 

[gokartergo]

[ QUOTE ]
[ QUOTE ]
WOW, then one of my 72lb scuba tanks should last alooong time.what do you guys use for the top of the tank?i don't think converting a scuba regulater would work cuz it.s low pressure for breathing? /forums/images/graemlins/k5.gifto /forums/images/graemlins/truck.gif

[/ QUOTE ]

co2 is 20lb liquid
diving air is just that, gas. less "air" in an air tank

20lb co2 is enough for me to fill 38x11 tires from 10~60psi twice

[/ QUOTE ]

I think your mistaken on that.. I have a 20lb tank. I probably filled my 36's from 6 pds to 35. 30 to 40 times and used air tolls in between.

 

[mcinfantry]

well i measured my tank from empty to full. it IS 20lbs. i let the air out my tires from 60 to 10. i aired them up. i did it again the next weekend. i have enough air to run air tools but not enough to fill the tires again. i guess i could be lying, and so could the scale???

 

[gokartergo]

[ QUOTE ]
well i measured my tank from empty to full. it IS 20lbs. i let the air out my tires from 60 to 10. i aired them up. i did it again the next weekend. i have enough air to run air tools but not enough to fill the tires again. i guess i could be lying, and so could the scale???

[/ QUOTE ]

I didn't say you where lying.. Just mistaken.. Maybe you have a leak on yours?? I have had mine for almost 3 years. I think I have had it filled up 4 times in that time..

 

[mcinfantry]

i agree with you,i dont know why it does that. only thing i can think of is because the air pressure is so high. anyone know how much volume it takes? is air pressure linear or exponential???
i.e. 10-35psi is 25 psi increase. is 35psi-60psi (again 25psi) the same volume????

no leaks i can find....

 

[az-k5]

14.7 psi is normal pressure (ouside). 30 psi is twice and 60 would be 4X. So filling all four of your 38's from 10 -> 60 is like filling 8 of them from 10 -> 35 or so. It takes a lot more air to create 60 psi than 30 psi. 30 psi is like 2 gallons of air in a 1 gal. tank, 60 psi is like 4 gal. of air in the same 1 gal. tank.

I hope that clears it up, nobody is lying, somebody is just driving on rock hard tires (or a really heavy truck) /forums/images/graemlins/grin.gif

 

[gokartergo]

[ QUOTE ]
14.7 psi is normal pressure (ouside). 30 psi is twice and 60 would be 4X. So filling all four of your 38's from 10 -> 60 is like filling 8 of them from 10 -> 35 or so. It takes a lot more air to create 60 psi than 30 psi. 30 psi is like 2 gallons of air in a 1 gal. tank, 60 psi is like 4 gal. of air in the same 1 gal. tank.

I hope that clears it up, nobody is lying, somebody is just driving on rock hard tires (or a really heavy truck) /forums/images/graemlins/grin.gif

[/ QUOTE ]

/forums/images/graemlins/whistling.gif Sounds good to me... I always sucked at math... /forums/images/graemlins/whistling.gif