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Old 07-21-2009, 01:56 AM   #1
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Default Racking onto yeast cake

If I have two brews that I want to use the same yeast with, and plan on racking the second beer onto the yeast cake of the first, do I need to do anything special? There is a green krausen ring composed of hops/trub that worries me a little, but I'm not sure how I would clean it off without compromising the yeast cake.

Is there a guide somewhere?

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Old 07-21-2009, 02:05 AM   #2
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You do not need to do anything. I rack out of a primary into a secondary or keg, while brewing and tehn rack from my brew kettle back into my carboy with the yeast cake. The carboy is still sanitized from the first batch.

Ed

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Old 07-21-2009, 02:10 AM   #3
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Look into the bottom of your bucket, say hello to the yeasties and congratulate them on a job well done. Then give them a little pep talk and dump in the next batch.

You may want to consider a blow-off tube instead of an airlock. You should get a vigorous fermentation.

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Old 07-21-2009, 06:12 AM   #4
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Sorry to hijack your thread, but I have some related questions:

Is it better to rack onto a yeast cake from a primary or a secondary, or does it not matter?

Also, does it matter if the styles of beer are different? I'm going to culture yeast from a 6-Pack of Oberon to make a clone. I was thinking about using the cake for a batch of Two Hearted, but I wasn't sure how well that would turn out. Would it be better to wash the yeast and then make a starter? Thoughts?

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Old 07-21-2009, 10:42 AM   #5
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Another question, can I skip the aeration since my yeast population is already so large and healthy? Or should I aerate in the kettle before racking onto the yeast?

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Old 07-21-2009, 02:32 PM   #6
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They need some oxygen to stay healthy so yes aerate.

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Old 07-21-2009, 04:23 PM   #7
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Quote:
Originally Posted by hopvine View Post
Another question, can I skip the aeration since my yeast population is already so large and healthy? Or should I aerate in the kettle before racking onto the yeast?

Aerate once you have it in the carboy/bucket. You will want all the air you can get and it will get the yeast back up into suspension.

You will want a 6+ gallon vessel for a 5 gallon batch if you are using an airlock and even then you have a chance of the krausen clogging it. As mentioned already a blow off tube is the best bet.
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Old 07-21-2009, 04:44 PM   #8
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FWIW - Be aware that the last thing the yeast did in your previous batch was clean up. If you had issues with the first batch's fermentation ( high temps, stuck fermentation) or brewed a very flavorful beer, stout or IPA, the yeast cake you are pitching onto will carry with it some of the flavors of the previous brew.

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Old 07-21-2009, 06:31 PM   #9
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Quote:
Originally Posted by beerkrump View Post
FWIW - Be aware that the last thing the yeast did in your previous batch was clean up. If you had issues with the first batch's fermentation ( high temps, stuck fermentation) or brewed a very flavorful beer, stout or IPA, the yeast cake you are pitching onto will carry with it some of the flavors of the previous brew.
Good point. I fermented the last batch (an American style wheat beer) at about 60F, and this is American Ale yeast (chico), so I should be alright.

Also, I'm thinking I'll use Fermcap-s to keep the krausen down.
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