Author Topic: OG right after pitching yeast  (Read 1398 times)

Offline In The Sand

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OG right after pitching yeast
« on: December 03, 2012, 09:00:40 AM »
So I'm an idiot.  I guess I was so happy that I had enought volume at the end of the boil that I forgot to collect some wort for an OG reading.  However, we noticed it as soon as we put the carboy in the fermentation chamber.  We immediately took it out and grabbed a sample for an OG reading.  I was going for 1.086, but got 1.071.  We already aerated and pitched the yeast.  I would estimate about 8-10 minutes passed between the pitching of the yeast and the OG reading.  Is this OG reading valid, or did the yeast start going that quickly?  FYI, I pitched two packs of US-05.
Trey W.

Offline davidgzach

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Re: OG right after pitching yeast
« Reply #1 on: December 03, 2012, 09:02:27 AM »
So I'm an idiot.  I guess I was so happy that I had enought volume at the end of the boil that I forgot to collect some wort for an OG reading.  However, we noticed it as soon as we put the carboy in the fermentation chamber.  We immediately took it out and grabbed a sample for an OG reading.  I was going for 1.086, but got 1.071.  We already aerated and pitched the yeast.  I would estimate about 8-10 minutes passed between the pitching of the yeast and the OG reading.  Is this OG reading valid, or did the yeast start going that quickly?  FYI, I pitched two packs of US-05.

1.071 is the number.  Did you take the reading at the right temp?
Dave Zach

Offline In The Sand

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Re: OG right after pitching yeast
« Reply #2 on: December 03, 2012, 09:14:06 AM »
So I'm an idiot.  I guess I was so happy that I had enought volume at the end of the boil that I forgot to collect some wort for an OG reading.  However, we noticed it as soon as we put the carboy in the fermentation chamber.  We immediately took it out and grabbed a sample for an OG reading.  I was going for 1.086, but got 1.071.  We already aerated and pitched the yeast.  I would estimate about 8-10 minutes passed between the pitching of the yeast and the OG reading.  Is this OG reading valid, or did the yeast start going that quickly?  FYI, I pitched two packs of US-05.

1.071 is the number.  Did you take the reading at the right temp?

Yes, we pitched at about 75F & I corrected the reading we got using Beersmith.
Trey W.

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OG right after pitching yeast
« Reply #3 on: December 03, 2012, 09:46:06 AM »
I'd recommend not pitching until the wort is below 68 for best results. Most esters and, more importantly, fusels are generated in the fist two days of fermentation. Starting the fermentation off cool will lower the fusel and ester production. I pitch WLP001/1056/WS05 around 64.
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Offline tschmidlin

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Re: OG right after pitching yeast
« Reply #4 on: December 03, 2012, 10:16:04 AM »
If it was a partial boil and you added water to it after the fact, then it's possible that you didn't mix it well enough and 1.071 is not the right number.  If it was a full wort boil then yeah, 1.071 is the number.

And I agree with what major said re: pitching temp.
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Re: OG right after pitching yeast
« Reply #5 on: December 03, 2012, 10:25:23 AM »
And I agree with what major said re: pitching temp.

+ 1.060
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Offline In The Sand

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Re: OG right after pitching yeast
« Reply #6 on: December 03, 2012, 10:36:30 AM »
If it was a partial boil and you added water to it after the fact, then it's possible that you didn't mix it well enough and 1.071 is not the right number.  If it was a full wort boil then yeah, 1.071 is the number.

And I agree with what major said re: pitching temp.

It was a full boil.  I may have to get a more efficient chilling process if I want to get it down to 68 or below.  I use a homemade immersion chiller and ice bath in a big wash tub.  I can chill to 70-75 range in about 20 minutes.
Trey W.

Offline repo

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Re: OG right after pitching yeast
« Reply #7 on: December 03, 2012, 10:48:38 AM »
You were not going to hit 1.086, with that recipe. You would be lucky to get 75% mash efficiency at this point in time. You told beersmith you would get 75% brewhouse efficiency, this is a quite an aggressive expectation this early in your brewing. I think 1.071 was about what to expect.

Offline morticaixavier

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Re: OG right after pitching yeast
« Reply #8 on: December 03, 2012, 10:56:37 AM »
If it was a partial boil and you added water to it after the fact, then it's possible that you didn't mix it well enough and 1.071 is not the right number.  If it was a full wort boil then yeah, 1.071 is the number.

And I agree with what major said re: pitching temp.

It was a full boil.  I may have to get a more efficient chilling process if I want to get it down to 68 or below.  I use a homemade immersion chiller and ice bath in a big wash tub.  I can chill to 70-75 range in about 20 minutes.

you have a controled temp fermentation chamber? just pop the wort in there over night after getting it down to 75ish with the temp control set to 62-64, in the morning it will be just right. aerate and pitch then.
"Creativity is the residue of wasted time" - A. Einstein

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Offline davidgzach

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Re: OG right after pitching yeast
« Reply #9 on: December 03, 2012, 12:29:15 PM »

It was a full boil.  I may have to get a more efficient chilling process if I want to get it down to 68 or below.  I use a homemade immersion chiller and ice bath in a big wash tub.  I can chill to 70-75 range in about 20 minutes.
[/quote]

I agree with the pitching temp as well.  If you can get to 70-75 in 20 minutes, I would think you can get to 65F in 30 minutes?
Dave Zach