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Old 10-04-2010, 02:45 PM   #1
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Default First yeast starter with stir plate- done?

Howdy all. I made a 4L starter with a stir plate for my 1.110 OG brew. My normal starters I let go 18-24 hours. 12 hours later (this morning) I took a look, there is a nice layer on the bottom and a LOT of krausen (or however it is spelled, foam stuff). Never had that before with my "sit on the shelf and forget about it" starters.

Should I let it keep going, or should I stop it and throw it into the fridge now? Not certain if I should read the foam as a sign that it is done. Bubbles are still rising up from the yeast, but not more foam. I am going to be using this starter in a couple days.

I would post a pic, but I am not allowed yet, alas.

Thanks for any input!

4L starter, 100g DME / L, 1 vial WLP530 liquid yeast, 1tsp yeast nutrient

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Old 10-04-2010, 02:55 PM   #2
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Heck if it is at high krausen, I would not chill it, nor decant it, I would swirl it all at brewing time and pitch it all. It is great to be able to pitch a starter at high krausen if you can. That usually means it's cooking already, I wouldn't do anything to lag it, especially making it go dormant to cold crash it.

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Old 10-04-2010, 03:03 PM   #3
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Agreed with the master. I've been able to "time" my last two brews with my stir plate so that I was finished brewing at High Karausen. I've been seeing "active" (read, my airlock is bubbling) within 3 hours or so.

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Old 10-04-2010, 03:07 PM   #4
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Quote:
Originally Posted by marsbike View Post
Agreed with the master. I've been able to "time" my last two brews with my stir plate so that I was finished brewing at High Karausen. I've been seeing "active" (read, my airlock is bubbling) within 3 hours or so.
I lucked out and got to do it for my barleywine even. It was awsome. It was already churning within 2-3 hours of yeast pitch.

Imho, cold crashing and even decanting starters are fine for starters that have run their course, but if you are lucky enough to catch one at high krausen, don't waste the opportunity to capitalize on it.
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Old 10-04-2010, 03:15 PM   #5
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If I was at a point to pitch it I would. However, my brew day is still a couple days away. The yeast starter is at the 12hr mark this morning, I might get to brewing this evening, which means (as I don't have a wort chiller hook-up) I will be pitching the yeast the day after that at the correct temp.

So, should I let it go for a few more hours and it won't hurt, or as it is at high krausen I should toss it in the fridge? I know ideally I would pitch it now (thanks Revvy!) but as that is not an option, I need to figure out if it should get put in the fridge now or let it keep going for another 4 hours.

Or is there something I am not getting that you are trying to tell me?

Thanks!

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Old 10-04-2010, 09:09 PM   #6
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Here's a question: I've been eyeing up a 1.090 OG holiday ale I want to try, so I figured I would probably have to make a big (like, 1 gallon) starter for it. For a starter with that much liquid, I would want to decant, right? Pitching that much starter liquid would change your OG, wouldn't it?

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Old 10-04-2010, 09:31 PM   #7
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A bit odd answering a question in my thread, but here I go :P

It would indeed decrease your OG, as you are watering it down a bit. Assuming a 5g 1.090 beer with a 1g 1.040 starter, your OG after pitching would be 1.082.

That being said, if you don't decant, you could always have a lower initial wort volume so when you pitch the starter you are just a bit above your expected final volume. I would say to decant if you are going to have the time to let it all settle, but that is just my opinion.

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Old 10-04-2010, 10:22 PM   #8
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A 4 liter starter with only 100g DME?
That's a very low gravity starter (or a typo). I'd try to add the missing extra 300g DME boiled in as little water as possible to give those poor little yeasties something to munch on.
I wouldn't mind adding a 4 liter starter to a 15 - 20 gallon brew, but if it's 5 or 10 gallons, I would chill and decant the starter, and just add the slurry.

-a.

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Old 10-04-2010, 10:33 PM   #9
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Quote:
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A 4 liter starter with only 100g DME?
That's a very low gravity starter (or a typo). / snip
-a.
I wrote 100g DME / L, that is 100 grams DME per Liter, or 400g DME total.
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Old 10-04-2010, 11:30 PM   #10
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I should learn to read more carefully.

Sorry,

-a.

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