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Old 04-01-2010, 01:03 AM   #1
ob111
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Default homemade carb cap

I am making a homemade carb cap and a homemade co2 generator
I have found lots of info on these but I haven't found much on the process when using them ie. what pressure to put in to my 2l of soda, do I shake it or not, how long it takes to be ready and tips and tricks for success.
I think I did see something about chilling the soda mixture before adding the co2 because it helps the mixture absorb the co2 but I could be wrong.
any help on this subject is appreciated
thanks

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Old 04-01-2010, 05:39 PM   #2
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I made one two weeks ago. I'm not sure what the maximum pressure you can use or even the best pressure. I started at 12 psi because that's what my regulator was already set at. I recently bumped it up to 20 and it alright, but I'm sure I'll go higher.

I fill about 3/4th of the bottle, squeez out the air, put on the cap and then fill it with co2. Shaking speeds up the process, as does using a chilled mixture.

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Old 04-02-2010, 12:56 AM   #3
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thanks
how long does it take to carbonate your soda
regulator? are you using a tank
I may switch to a tank depends on how well the co2 generator works
for me

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Old 04-02-2010, 01:22 AM   #4
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For beer, I fill a 2 liter up to where the curve starts. Refrigerate to 40F. Hit it with 30 lbs CO2. Lay it on its side and roll back and forth rapidly and count to thirty. Repeat (add CO2 & roll) 2 more times. With soda I set the CO2 on 45 lbs and do 4 repetitions. My cap is the tire valve type so the CO2 is not on the bottle the whole time. Both the beer & the soda will have quite a carbonic bite but this usually mellows overnight in the fridge, maybe a little longer with the soda.

If I could I would do the soda even higher like 50-55 lbs but my regulator safety valve starts releasing around 45 lbs

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Old 04-02-2010, 01:34 AM   #5
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I can't help but ask if you had to pay the ho who made your cap?

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Old 04-02-2010, 02:39 AM   #6
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thanks shellybelly I will try 50 -55 lbs
I don't have a regulator on my set up so I can try that
I daisy chained several 2l bottles together with tubing and use sugar water and yeast to make my co2 then 1 tube comes out of the bottles right in to the inlet of a small air compressor
the compressor sucks the co2 out of the bottles (which it why I have one wet 2l bottle and 4 dry 2l bottles daisy chained so if it sucks the bottles right down I won't suck the water into my pump) and will pumpout what ever pressure I want up to about 180 psi

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Old 04-02-2010, 02:51 AM   #7
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EDIT - allow me to rephrase.

The compressor is probably unnecessary. Fill all of the bottles with water. Arrange them so that the "active" bottle displaces the water in the other four with CO2. Once the system is "dry," put an adjustable relief valve (spunding valve) on the bottle rig, and let it come up to pressure over the course of a few days. Then use that built up pressure for small volume carbonation. It could work, but it seems like a lot of trouble for little gain.

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Old 04-02-2010, 04:05 AM   #8
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I asked on another post how much pressure yeast would produce and someone replied that it would stop at 14 psi which is why I was putting the pump inline (plus I'm a millwright and I like tool time "more power" "ugh ugh ugh ugh")
but now that I think about it I hear about people using plastic instead of glass bottles because glass sometimes explodes common sense is telling me it would take a lot more than 14 psi to make a glass bottle explode so now I wondering how much pressure the yeast will produce in a sealed container.
may be I don't need the compressor

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Old 04-02-2010, 01:38 PM   #9
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well I've blown the 14 psi away! my generator has so far has produced
49 psi in 12 hours. I will post later and let you know what the pressure goes up to over time


this is just for information purpose
to may be answer the pressure yeast can produce
for this test I used one 2l bottle

2 cups of warm water (tap)
3/4 cup of sugar
1 tbl bread yeast
my homemade carb cap
1 Canadian tire tire pressure gauge

be back later with update

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Old 04-02-2010, 06:20 PM   #10
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i usually use about 30 psi with my carb cap. Lots of shaking till it does not seem to take any more gas from the tank, then sit it over night in the fridge. Then it's usually good to go. More shaking won't hurt, say every hour or few, neither will more pressure, but i think the carb cap I have says 40psi as a max. You can play and let us know what pressure the plastic 2 liters rupture at

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