Author Topic: Diacetyl Rest Question  (Read 645 times)

Offline Ellismr

  • Assistant Brewer
  • ***
  • Posts: 118
    • View Profile
Diacetyl Rest Question
« on: November 14, 2017, 03:00:26 PM »
Quick question:  Last Thursday (11/9) I brewed a pilsner.  My first one.  At the time I didn't have plans for the upcoming holiday.  Now I'm leaving the state for Thanksgiving which is my 2 week mark for primary fermentation.  I'll be back the following Sunday (11/26).  Would it be horrible to wait until 17 day mark to conduct a diacetyl rest?  I fermented with WLP 830.

Thanks for your advice.

Brew what you like & brew often.

Offline denny

  • Administrator
  • Retired with too much time on my hands
  • *****
  • Posts: 19184
  • Noti OR [1991.4, 287.6deg] AR
    • View Profile
    • Dennybrew
Re: Diacetyl Rest Question
« Reply #1 on: November 14, 2017, 04:38:52 PM »
Quick question:  Last Thursday (11/9) I brewed a pilsner.  My first one.  At the time I didn't have plans for the upcoming holiday.  Now I'm leaving the state for Thanksgiving which is my 2 week mark for primary fermentation.  I'll be back the following Sunday (11/26).  Would it be horrible to wait until 17 day mark to conduct a diacetyl rest?  I fermented with WLP 830.

Thanks for your advice.

That will be fine.  You may not even need one.  I seldom do.
Life begins at 60.....1.060, that is!

www.dennybrew.com

The best, sharpest, funniest, weirdest and most knowledgable minds in home brewing contribute on the AHA forum. - Alewyfe

"The whole problem with the world is that fools and fanatics are always so certain of themselves, and wiser people so full of doubts." - Bertrand Russell

Offline Steve Ruch

  • Senior Brewmaster
  • ******
  • Posts: 1000
    • View Profile
Re: Diacetyl Rest Question
« Reply #2 on: November 14, 2017, 06:33:32 PM »
That will be fine.  You may not even need one.  I seldom do.

This^^^.
Crescent City, CA

I love to go swimmin'
with hairy old women

Offline brewinhard

  • Official Poobah of No Life.
  • *
  • Posts: 3207
    • View Profile
Re: Diacetyl Rest Question
« Reply #3 on: November 14, 2017, 07:07:12 PM »
Yeah, I would think by that point that the yeast have most likely reabsorbed any of the diacetyl produced during fermentation.

Offline Ellismr

  • Assistant Brewer
  • ***
  • Posts: 118
    • View Profile
Re: Diacetyl Rest Question
« Reply #4 on: November 14, 2017, 08:41:31 PM »
Quick question:  Last Thursday (11/9) I brewed a pilsner.  My first one.  At the time I didn't have plans for the upcoming holiday.  Now I'm leaving the state for Thanksgiving which is my 2 week mark for primary fermentation.  I'll be back the following Sunday (11/26).  Would it be horrible to wait until 17 day mark to conduct a diacetyl rest?  I fermented with WLP 830.

Thanks for your advice.

That will be fine.  You may not even need one.  I seldom do.
So to clarify, you let it hit terminal gravity and then go straight to a lagering phase?

P.S. love your books

Cheers,
Matt


Sent from my iPhone using Tapatalk Pro
Brew what you like & brew often.

Offline denny

  • Administrator
  • Retired with too much time on my hands
  • *****
  • Posts: 19184
  • Noti OR [1991.4, 287.6deg] AR
    • View Profile
    • Dennybrew
Re: Diacetyl Rest Question
« Reply #5 on: November 14, 2017, 08:58:27 PM »

So to clarify, you let it hit terminal gravity and then go straight to a lagering phase?

P.S. love your books

Cheers,
Matt


Sent from my iPhone using Tapatalk Pro

Thanks!

Once it's at or near FG, I take a gravity reading then taste the sample.  Ig I don't taste diacetyl, it gets kegged and into the fridge.  If I taste diacetyl, I either let it go longer or warm it up.  Remember, it's not the temp itself that's reducing diacetyl, it's the yeast, and by warming it up the yeast becomes more active.  But I've also found that a big healthy initial pitch followed by plenty of fermentation time usually eliminates the need for a separate d rest.
Life begins at 60.....1.060, that is!

www.dennybrew.com

The best, sharpest, funniest, weirdest and most knowledgable minds in home brewing contribute on the AHA forum. - Alewyfe

"The whole problem with the world is that fools and fanatics are always so certain of themselves, and wiser people so full of doubts." - Bertrand Russell

Offline Ellismr

  • Assistant Brewer
  • ***
  • Posts: 118
    • View Profile
Re: Diacetyl Rest Question
« Reply #6 on: November 14, 2017, 10:14:17 PM »

So to clarify, you let it hit terminal gravity and then go straight to a lagering phase?

P.S. love your books

Cheers,
Matt


Sent from my iPhone using Tapatalk Pro

Thanks!

Once it's at or near FG, I take a gravity reading then taste the sample.  Ig I don't taste diacetyl, it gets kegged and into the fridge.  If I taste diacetyl, I either let it go longer or warm it up.  Remember, it's not the temp itself that's reducing diacetyl, it's the yeast, and by warming it up the yeast becomes more active.  But I've also found that a big healthy initial pitch followed by plenty of fermentation time usually eliminates the need for a separate d rest.
Thank you


Sent from my iPhone using Tapatalk Pro
Brew what you like & brew often.

Offline a10t2

  • Official Poobah of No Life.
  • *
  • Posts: 4365
  • Ask me why I don't like Chico!
    • View Profile
    • SeanTerrill.com
Re: Diacetyl Rest Question
« Reply #7 on: November 14, 2017, 11:04:15 PM »
At 7 days you're probably getting close to diacetyl rest time anyway. I start letting the beer warm itself up once I see 60-70% ADF.

So I guess my big-picture answer would be, these things are determined by gravity, not a timeline you can set in advance.
Sent from my Microsoft Bob

Beer is like porn. You can buy it, but it's more fun to make your own.
Refractometer Calculator | Batch Sparging Calculator | Two Mile Brewing Co.

Offline ynotbrusum

  • I spend way too much time on the AHA forum
  • ********
  • Posts: 2719
  • Da mihi sis cerevisiam.
    • View Profile
Re: Diacetyl Rest Question
« Reply #8 on: November 16, 2017, 10:39:13 PM »
I used to do D-rests, but like Denny said, if you pitch enough yeast, a D-rest is not necessary.  I just pitch a lot of yeast and rack when I get around to it after a couple weeks or more in the primary, sometimes as many as 4 weeks after pitching.  And this is for lager yeast and cold fermentation, mind you, as well as cold fermented ales and hybrids.

Best of luck with your pilsner!
Hodge Garage Brewing: "Brew with a glad heart!"