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Old 06-07-2006, 05:54 AM   #1
digdan
 
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I used to have a lot of airlocks blow off, or get filled with the foam/krausen from my beer when I was an extract brewer. Since I've gone AG a year ago I have not had a single problem with foam/krausen overflow from violent fermentation.

Is this normal, or am I doing something wrong(i kinda liked the violent fermentations)? Is it the protiens or natural oils that keep the fermentation at ease?

thx

 
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Old 06-07-2006, 12:35 PM   #2
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Aeration, maybe?

If you were topping off partial-boil extract worts with bottled or tap water, you were adding a lot of O2 to the wort.

What are you doing to your AG batches to aerate them?
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Old 06-07-2006, 01:12 PM   #3
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Was this an all malt recipe ?

Kai

 
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Old 06-07-2006, 03:24 PM   #4
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Quote:
Originally Posted by cweston
Aeration, maybe?

What are you doing to your AG batches to aerate them?
along the same line of O2 reasoning:
What temp are you cooling to? O2 solubility is greatly effected by temp.
The lower the temp, the more O2 you can dissolve, the more yeast can grow (divide), the faster the kickoff....

 
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Old 06-07-2006, 03:56 PM   #5
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I have noticed the same thing, my only blowoffs have been extract or mini-mashes with a lot of extract. My guess would be that the sugars in extract are more uniform, so the yeast adapt to them faster. Alternately, my high gravity ales always have extract in them and those are the only ones that blow.
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Old 06-07-2006, 04:39 PM   #6
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Aeration and starters are the two main things that help active ferments.
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Old 06-07-2006, 09:17 PM   #7
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I use an aquarium air pump, with an inline filter to a metalic airstone. I let it run until it start sto foam out of the top, which is ussually around 2 to 3 minutes.


Quote:
Originally Posted by cweston
Aeration, maybe?

If you were topping off partial-boil extract worts with bottled or tap water, you were adding a lot of O2 to the wort.

What are you doing to your AG batches to aerate them?

 
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Old 06-07-2006, 09:18 PM   #8
digdan
 
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I havn't noticed that adjuncts affected it eigther way.

Quote:
Originally Posted by Kaiser
Was this an all malt recipe ?

Kai

 
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Old 06-07-2006, 10:58 PM   #9
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Quote:
Originally Posted by digdan
I use an aquarium air pump, with an inline filter to a metalic airstone. I let it run until it start sto foam out of the top, which is ussually around 2 to 3 minutes.
Is that what you were doing for the extract batches as well??? 2-3 minutes is way short of what I've seen recommended... 30-60 minutes is what I see quoted when using air, 1-2 minutes is for pure O2...

I've taken to transferring my cooled wort into my 7 gallon plastic bottling bucket, covering and running the air pump for 30 minutes or until the foam reaches the top of the bucket, which ever takes longer... I then transfer from under the foam into my carboy...the foam contains trub and break particles, so it's ok to get rid of part of it (this is the principle behind a "flotation tank"; the aeration of the wort and the removal of trub and break material at the same time)

A little info on yeast and aeration is here: http://byo.com/feature/177.html

hope that helps some,

later,
mikey
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Old 06-07-2006, 11:01 PM   #10
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I'd bet you are under-pitching. Step up that starter once or twice before brew day and then see what happens.
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