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General Category => Yeast and Fermentation => Topic started by: Pope of Dope on February 10, 2019, 07:11:28 PM

Title: temps
Post by: Pope of Dope on February 10, 2019, 07:11:28 PM
Quick and basic question: After the first week or two of ferment under proper temps., gravity now being mostly unchanged or even if there is a stuck ferment, is it alright to raise temps to mid-high 70's--above "optimal" temps for that yeast strain?

Or, always keep temps in range?
Title: Re: temps
Post by: chezteth on February 10, 2019, 07:20:24 PM
Quick and basic question: After the first week or two of ferment under proper temps., gravity now being mostly unchanged or even if there is a stuck ferment, is it alright to raise temps to mid-high 70's--above "optimal" temps for that yeast strain?

Or, always keep temps in range?
Yes, it's ok to raise the temp.

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Title: Re: temps
Post by: Robert on February 10, 2019, 07:37:27 PM
To the temps you're talking,  yes.  Don't go too high for the strain (say 80s or 90s unless its Bekgian or Norwegian) where you'll stress it, or of course high enough to kill it.  But in any temperature controlled environment you're probably good.  Don't set it in your garden shed in the summer.
Title: Re: temps
Post by: BrewBama on February 10, 2019, 07:48:11 PM
According to Chris White “Diacetyl reduction is slower at colder temperatures, so it is essential to incorporate the diacetyl rest when making cold fermented lagers. The process is simply to raise the fermentation temperature from lager temperatures (50-55F) to 65-68F [I use 70*F] for a two day period near the close of the fermentation. Usually the diacetyl rest is begun when the beer is 2 to 5 specific gravity points away from the target terminal gravity. The temperature is then lowered to conditioning temperature following diacetyl reduction.

For ale production, the fermentation temperature is usually 65-70F, so temperature modification is not necessary [I usually ferment Ales at 65*F so raise temp by 5*F]. But the fermentation should still be "rested" at this temperature for two days to ensure proper diacetyl reduction.”

Ref: https://www.whitelabs.com/sites/default/files/Diacetyl_Time_Line.pdf


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Title: Re: temps
Post by: denny on February 10, 2019, 07:50:15 PM
I raise the temp to 70-72 after 4-5 days for every beer I make, ale or lager.
Title: Re: temps
Post by: Robert on February 10, 2019, 08:10:12 PM
I raise the temp to 70-72 after 4-5 days for every beer I make, ale or lager.
Same here.  (Actually even sooner for ales.  Just wait till at least 50% AA.)
Title: Re: temps
Post by: denny on February 10, 2019, 08:32:45 PM
I raise the temp to 70-72 after 4-5 days for every beer I make, ale or lager.
Same here.  (Actually even sooner for ales.  Just wait till at least 50% AA.)

Being lazy....er, pragmatic...I figure at 4-5 days it's at 50% and I don't check it.
Title: Re: temps
Post by: robdogj on March 10, 2019, 05:06:31 PM
According to Chris White “Diacetyl reduction is slower at colder temperatures, so it is essential to incorporate the diacetyl rest when making cold fermented lagers. The process is simply to raise the fermentation temperature from lager temperatures (50-55F) to 65-68F [I use 70*F] for a two day period near the close of the fermentation. Usually the diacetyl rest is begun when the beer is 2 to 5 specific gravity points away from the target terminal gravity. The temperature is then lowered to conditioning temperature following diacetyl reduction.

For ale production, the fermentation temperature is usually 65-70F, so temperature modification is not necessary [I usually ferment Ales at 65*F so raise temp by 5*F]. But the fermentation should still be "rested" at this temperature for two days to ensure proper diacetyl reduction.”

Ref: https://www.whitelabs.com/sites/default/files/Diacetyl_Time_Line.pdf


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Thanks for that tidbit. Now the problem I have is this 3 gallon carboy of wort that I added a .5 cup of water w/ gelatin. I was attempting to clear up the wort but I inadvertently started a 2nd fermentation. I going to lower the temp of the wort even more now, but I am sure your insights will help me 100%.
Thanks!!!
Title: Re: temps
Post by: Robert on March 10, 2019, 05:14:09 PM
Are you sure you restarted fermentation?   If it's just that you're seeing bubbles in the airlock, that could be nothing more than CO2 gassing off out of solution.  Check gravity to determine if there's ongoing fermentation.
Title: Re: temps
Post by: robdogj on March 10, 2019, 11:50:03 PM
Are you sure you restarted fermentation?

Yes, I had foam in the airlock & I had to put in a blowout tube instead