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Old 04-06-2007, 01:23 AM   #1
bitteral
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Just bottled a batch today, and am in the midst of brewing another. If I want to reuse the yeast cake in my primary fermenter, do I just leave it there, with the gunk around the top from the last batch, and pour the new wort/water on top of it?

Or do I need to move the yeast cake into a newly cleaned fermenter?

TIA



 
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Old 04-06-2007, 02:07 AM   #2
uwmgdman
 
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Leave it be and pour wort on top, the results will be explosive. Seriously you'll have the most vigorous fermentation you've ever had and it will start up in a hour or two. Attach a blow-off tube not an airlock unless you like cleaning up messes.

My Celebration IPA was dumped onto a 1056 cake and it turned out wonderful.



 
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Old 04-06-2007, 02:16 AM   #3
Glibbidy
 
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You'll also need to pitch it ideally within a few hours if you are leaving it in the primary...pitching on the cake that is.

 
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Old 04-06-2007, 02:30 AM   #4
bitteral
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Thanks. I'm going to give it a try. It will be less than 3 hours from the time emptied the beer from the primary til the time I'm going to pour in the new wort (less than an hour from now). I left just a small amount of beer over the yeast cake, probably like a 1/4 inch and covered the top with plastic in the meantime.

 
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Old 04-06-2007, 01:18 PM   #5
bitteral
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Help!

Its been about 10 hours since I put the new wort/water over the old yeast cake, and I see no activity. No bubble from the blow-off tube, and I briefly opened the fermenter to peak in and saw no activity.

Should I wait a while longer, or pitch some new yeast?

 
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Old 04-06-2007, 01:22 PM   #6
homebrewer_99
 
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Quote:
Originally Posted by bitteral
Just bottled a batch today, and am in the midst of brewing another. If I want to reuse the yeast cake in my primary fermenter, do I just leave it there, with the gunk around the top from the last batch, and pour the new wort/water on top of it?

Or do I need to move the yeast cake into a newly cleaned fermenter?

TIA
You didn't do a secondary?

Did you pour hot wort on the cake? That would shock the yeast something fierce.
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Old 04-06-2007, 01:38 PM   #7
bitteral
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HB, I had not used a secondary, just 19 days in a primary. (Haven't yet bought a carboy for secondary, and have been doing ok with primary only so far--- I've only brewed 4 batches to date.)

Wort and water and old yeast cake were all at about 70F, probably withing a degree or two.

I did not pour in the wort to rigorously, but did pour the water on top fairly vigorously. I stirred the batch up, but didn't make any attempt to stir up the yeast from the bottom.

 
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Old 04-06-2007, 03:14 PM   #8
britishbloke
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Pouring on top of a yeast cake doesn't mean it'll take off in quick.

I've done this many times and it still takes around 16-24 hours.

It will work though, have patience.
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Old 04-06-2007, 03:19 PM   #9
bitteral
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Thanks. Glad to hear that. Now I'll feel comfortable to wait it out for the rest of the day. 11:30pm will be the 24 hour mark.

I'll post the result either way.

 
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Old 04-06-2007, 03:28 PM   #10
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OK, I was just asking those questions for clarity.

Make sure you stir the yeast up off the bottom next time. It was probably packed a little. If the yeast had been more in suspension then it may have taken off faster.


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