yo y mis circunstancias: Compresor casero barato para tubeless y variantes

viernes, septiembre 19, 2014

Compresor casero barato para tubeless y variantes

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Ghetto tubeless inflator - total cost 9p!
114 posts & 78 voices | Started 3 years ago by Ewan | Latest reply from jordie

Stans the badger method too cheap to but a compressor Tubeless

I’m sure i’m not the first person to have come up with this, but I was so surprised it actually worked I thought I’d share....

What you need

2L Pop bottle – I used a Morrisons 9p mineral water bottle
Two old presta innertubes – I used two old punctured ones
A drill
A 5.5mm drill bit
Hacksaw
A pump
Some plastic tubing – 5-6mm internal diameter?
Gaffa tape if you’re not feeling brave

Total cost – 9p

How you do it
1 – Cut the valves out of the inner tubes – you only need a small amount round the base
2 – Cut one of the valves about halfway down to remove the internal valve bits
3 – Drill two 5.5mm holes in your bottle lid – not too close to the edge or it won’t close
4 – Shove both valves through holes
5 – Use the presta lock rings to get a decent seal (use pliers if you have weak lady hands)
6 – Put tubing over the cut off valve
7 (optional) – Wrap gaffa tape round the bottle to strengthen it. If you’re super paranoid stick it in the cut off jeans leg. That said in my younger days we used to inflate them to 80psi and then shoot nails in them from a home made air gun (bang!)

How you use it

1 (optional depending on how stubborn the tyre is) – Remove valve core
2 – Attach other end of tubing to valve
3 – Put a good kink in the tube by folding over
4 – Attach pump to other valve
5 – Inflate to 40psi or so
6 – Remove kink (quickly)
7 – Tyre inflates very quickly!
8 – (optional) If you’ve removed the valve core do the inflation a couple of times, then put the core back in and inflate a final time
9 – Use a pump on the wheel valve to pump up to desired pressure

Seems to work a treat – had to remove the valve core on one of my new high rollers but not the other one.

Close up of the valve:

photo(6).jpg by Ewan Panter, on Flickr

Attached to wheel valve:

photo(5).jpg by Ewan Panter, on Flickr

In action:

photo(4).jpg by Ewan Panter, on Flickr

It works!

photo(2).jpg by Ewan Panter, on Flickr

Proper ghetto:

http://ceciliobenito.blogspot.com.es/2014/08/bontrager-la-bomba-especial-tubeless.html

comments
A few key points:
1) make sure the bottle is for fizzy drinks (ie. designed to withstand pressure)
2) make sure the bottle has no damage (scratches etc)
3) fill the bottle with water first and pressure test well above what you plan to use it at (I pumped it up to 100psi but understand they normally fail above 150psi). Since water is incompressible it doesn't store energy and so a failure won't do any damage.
4) I've tied the valve assembly to the bottle in case the threads fail (to avoid high speed projectiles) and wrap it in a blanket in use.

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DON'T PRESSURISE BOTTLES THAT AREN'T DESIGNED TO HOLD PRESSURE!

FROM PERSONAL EXPERIENCE*, A FIZZY DRINKS BOTTLE CAN HANDLE ABOUT 150PSI**, BUT A 'SQUASH' BOTTLE CAN'T HANDLE VERY MUCH AT ALL.

DON'T PRESSURISE 'SQUASH' BOTTLES, THEY CAN AND DO GO BANG.

IN A LOUD AND SCARY WAY.

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I inserted one valve in the bottom of the bottle - more hassle to get it in there, though maybe easier than two in the cap - and used a proper plumbing valve and pump adapter like totoro's version

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thought i would bump this with my effort,

1 x barb vacum fittings
1 x foot pump
1 x used helium bottle
and some silicon pipe

cost £0 as had everything in the garage

works perfect

due to the high volume of the canister it takes a good few mins of pumping to get it up to 3 bar but once there its pumps the tyre with ease and i done 3 tyres (put one on the wrong way around doh lol)without anymore pumping :D:D

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