View Full Version : filling car(jeep) tires with a scuba tank

bigman241

02-28-2011, 02:03

I got a inflator for my reg for the opps I got a flat or such. I have question do you think a al80 would fill 4 31/10.5/15 goodyear mtrs when their flat? I ask should I go to trail which I need to deflate my tires to run through. If the 80 would not what about a steel 130

FishFood

02-28-2011, 07:01

You could replenish all four tires and still get a good dive out of the tank.

bennerman

02-28-2011, 07:53

You could replenish all four tires and still get a good dive out of the tank.

I was 99% sure that was right, but the 1% kept me from posting the exact same thing :P

bigman241

02-28-2011, 09:19

I figured that, but on the jeep forum I used they tried to say I would be lucky to get 2 filled, I remember a year ago someone figured the math for me, and said I would get like 2 full fills out of one tank, thinking leaving one tank in the back 24/7 for the opps my tires is flat, or ohh nice trail. They work good, my dad fills our truck tire, well did we traded the truck, it would do better then a compressor

fire diver

02-28-2011, 11:47

Whoever said you would only get a couple of tires filled, doesn't know scuba tanks. Maybe it would suck like that if you only filled the tank to 100 psi off a shop compressor. 80cf, starting at 3000 psi would fill a lot of tires. Just be sure to be careful, there's a lot more pressure behind that inflator than your tire needs.

Found this interesting:

A tire on a wheel is basically a torus.

Formula for Volume of a torus= 2*(pi)^2*R*r^2

Where R=distance from center of wheel to center of tube

r=radius of circle formed by tire/wheel (cross section)

If the wheel is a 17 and the rim is six inches, volume =(approx) 1.85 cubic feet.

At two bar (28 psi) that's 3.7 cubic feet of gas.

scubagirlj

03-03-2011, 12:06

Found this interesting:

A tire on a wheel is basically a torus.

Formula for Volume of a torus= 2*(pi)^2*R*r^2

Where R=distance from center of wheel to center of tube

r=radius of circle formed by tire/wheel (cross section)

If the wheel is a 17 and the rim is six inches, volume =(approx) 1.85 cubic feet.

At two bar (28 psi) that's 3.7 cubic feet of gas.

dude- you DO have too much time on your hands

dude- you DO have too much time on your hands

Umm, that wasn't exactly rocket-science. Not even year 10 maths. OK, I can understand that volume of a torus might not be immediately obvious, but P1V1 = P2V2? We should all know that one.

I used an tire inflator on my lp hose to get me home from a dive site before. Was at a local quarry and had a flat when I went to leave. It was about a 100 miles home and didn't want to drive that on a spare. Filled up the tire to see how bad it was. Couldn't find the leak with the tire still on the car so I drove home. Stopped after 20 minutes to check it and then a few more times. Added air once but it really wasn't that low about 24psi for a tire that was supposed to have 32psi in it.

bigman241

03-03-2011, 22:24

thanks guys, getting some toys on her, rhino on the tub inside, and the rocker panels, warn winch and a off road bumper, now I just need to water proof her for dive trips

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