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Author Replies
Joelle
07/15/07 11:05 AM  
92F too much heat for yeast starter?
Hey guys. My 2.5L starter has been on the stir plate for about 21 hours now. I went in and felt 1 G apple juice jar I'm using as my container for the starter and it felt a little warm. The top of the stir plate felt pretty warm too, so I checked the temp of the starter and it is 92F. Do you think there's something wrong with my stir plate, or is this normal? I have it in a room that is 72F.

Joelle

BPotts
07/16/07 12:39 AM  
Re: 92F too much heat for yeast starter?
I know the temp of fermenting wort rises from yeast acivity but I've never heard of it rising that much....
Al B
07/16/07 08:13 AM  
Re: 92F too much heat for yeast starter?
Stir plates do get warm after awhile, since they're usually on fast speed. A small fan may help.
Baums
07/16/07 10:06 AM  
Re: 92F too much heat for yeast starter?
92 is obviously high, but certainly there are at least some strains that should do okay. I agree that it's probably your stir plate (not the ferment) that's generating the heat. Are you running it at higher speed than necessary?

If not, Al's fan idea sounds like a good next step.

Is your stir plate homemade or commercial?

Joelle
07/16/07 10:33 AM  
Re: 92F too much heat for yeast starter?
It's a Thermolyne 7200 Cold Stirrer that we got used off of ebay. Dan built a wooden stand yesterday with a thin wood top for the jar to sit on. This raises it just a little bit above the top of the stir plate and seems to be keeping it much cooler now. It appears that it was the stir plate itself that was getting too warm. We're making an Alt tonight with the yeast and are planning to start cooling the starter to our 60F fermentation temp when we begin the brew. We'll decant the starter liquid off the top of the yeast before pitching. Let you know how it goes.
Joelle
07/25/07 06:06 PM  
Re: 92F too much heat for yeast starter?
Update. Things went fine with the beer after pitching the starter that hit 92F for a few hours WLP 036 Dusseldorf Alt. We decanted most of the liquid after letting the yeast settle out for 3 or 4 hours. It fermented out in about 5 days at 60F.
mikek
01/09/08 05:07 AM  
Re: 92F too much heat for yeast starter?
yeast cells are fragile in the dry state.92f to hydrate is fine even through the fermentation process.

Baums
01/09/08 10:10 AM  
Re: 92F too much heat for yeast starter?
Maybe the reason 95F is suggested by the yeast companies as the ideal rehydration temp is that the yeast are dried at 95F? (Hence rehydrating at a different temp will over- or under- "inflate" them.)
 
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