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Hi Folks,
Started a cornflakes ferment yesterday AM. Started @1.07 SG. Pitched the yeast at 86°. Active fermentation Started within an hour. Last night temp was still around 86°F. Woke up this AM and temp was up to 107°F. SG was already down to 1.024.

Any concerns about how high the temp has gotten? It's only a 2 gal wash, as I did it to have backset for a 5 gal mash.
Should I just run this (it's around 6%abv now)?

I was pretty surprised by the amount of fermentation and the temp, to say the least.

My recipe, FWIW: 18 oz walmart cf, heated 1.5 galwater to 175 and added 2 tbsp amylase. cooled overnight= sg1.012. added in 1.75lb sugar in warm water. 2 gal @ 1.07. 2 tbsp yeast nutrient and 1 tsp citric acid. Pitched bread yeast @0845AM. Actively fermenting @ 0945.

Thanks for any advice!
M.

Let it dry and clear. You will get a better product imo. Don't rush it. More often than not.. I let mine clear for at least a week. Sometimes more. Have fun and stay safe.

Not in a rush. Just concerned about the temp...

You stressed the yeast and obliterated a few of their number.
They need tender loving care.
Check the PH levels and send in fresh recruits

I allowed a large ferment to overheat once by insulating the fermenter too soon. It cooled and restarted on its own with no ill effect aside from taking longer than usual to finish. Knowing I had stressed the yeast, I allowed more time for the batch to sit and clean itself up.

I'm surprised your small volume was able to self heat that much, I find batch sizes less than 20L or 5 gallons don't make that much extra heat.

I've been making wine for years. Never had this happen. It's still sitting at 100°... going to taste it later and check the sg again.

Stonecutter wrote: ↑Sat Mar 25, 2023 8:50 am You stressed the yeast and obliterated a few of their number.

Any idea how I might have stressed them?

mrfee wrote: ↑Sat Mar 25, 2023 10:46 am Any idea how I might have stressed them?

Hmmm
Would you be stressed if I put you in a room at say 114F and forced you to eat a huge meal?

Is the wash still fizzing or showing other signs of still working? , if so I wouldn't worry.
Do a simple google search using " maximum temprature for bread yeast".....look at the advice from Baking posts that the search finds.
I doubt you have damaged your yeast at that temp.

It definitely depends on what yeast strain you used. No sense in arguing the level of stress put on the colony. Maybe there wasn’t any. I certainly can’t ask the yeast myself how they feel.
I stand by my suggestion.

Ok. So I asked them how they were doing. They said, "Fizz, bibble, bubble."
Temp is at 99. The SG 1.02. Ph was 2.8.

Thanks again for feedback. Now to go research ph ranges from fermentation cornflakes...

Thanks!
M.

If they’re fizzing away and the ferment still smells decent ya might not need to do anything. The PH check was really just a checkup and if it’s readily available adding a little extra yeast can’t hurt. As others have mentioned above you’re probably just fine. I’m sure you already know, it’s no bueno to mess with a ferment like opening it up and poking and prodding.

This is along the lines of something I was trying to figure out recently. While I understand the different yeast strains have different temperature ranges where they work best, so they also have different lethal temperatures? To use a human analogy, some people are comfortable in a t-shirt in freezing weather, others need a jacket on a warm spring day, but pretty much everyone suffers actual physical damage at about the same temperature. Is that true of yeast?

It clearly says he used Bread Yeast.
Bread yeast will handle those sorts of temps according to the Bakers.

Perhaps the Baker can chime in.

Stonecutter wrote: ↑Sat Mar 25, 2023 8:50 am You stressed the yeast and obliterated a few of their number.
They need tender loving care.
Check the PH levels and send in fresh recruits

Saltbush Bill wrote: ↑Sat Mar 25, 2023 6:43 pm It clearly says he used Bread Yeast.
Bread yeast will handle those sorts of temps according to the Bakers.

Well shit. I’ll take my foot out of my mouth mrfee. I honestly didn’t see that tidbit of information until reading SBB post. Sorry for the dramatics
Carry on…nothing to see here

All good. All the comments, from everyone got me thinking a bit. And that's always a good thing. I haven't checked temp before and seen it get that high. Was just a vigorous ferment, I guess. It's still fizzing along. I am going to racknit to a secondary carboy to finish and clear, later today. No worries, no hurries!

Thx.
M.