I have a 6" section of 3/4ths inner diameter tubing that I want to make air tight.

My idea is to seal this section and then fill it with air that can be regulated by a valve and used elsewhere.

This is my question. What would be the best choice to get the most air? A rubber tube with the ends sealed filling the area, or a tubular air hose that fit inside and filled the same area.

Is one better than the next or would they both equal the same as the limiting factor is the 3/4ths ID tube in the 1st place?

Thanks.

Volume is volume. Simple geometry. Seriously curious, what are you doing?

^ Agreed, volume is volume, but safety may be an issue if you're using high pressure. Don't want to make a little bomb out of it. So what are you doing?

^^^ uber interested. 10.60cubic inches of air if i did my 10th grade math right

to use for what? On drag bikes we seal up the entire frame sections and or swingarms we build to hold air for shifting and clutch duties, a swingarm of a standard 70's kz1000 will hold enough co2 at 250psi to get a clutch release regulated for launch and thenupshift 4-5 gears reliably before falling to a level where it cannot give enough pressure to do any good.

on my air shifted streetbike "gixxer-kart" back in the day i had to run two small coleman propane bottles with a dedicated pump from cadillac air ride connected to a hobbs switch to maintane the needed 125psi used to work the clutch with a 3/4inch diameter by 3" travel cylinder used for the clutch and same cylinder used for shifting both up and down (kart was way too scary to spare a hand off the wheel for shifting) 90+mph and spinning some good blue groove cart tires like they had oil on them put you constantly sideways and in fear for your life (building another soon as i get some valves and ignition system for the donated 600f4i engine that a friend put towards the re-encarnation project)

125 was the minimum, 200 plus was the only way to ensure perfect shifts and clutch release to downshift or come to and launch from a stop