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Home Brew Forums > Home Brewing Beer > All Grain & Partial Mash Brewing > Huge RIS Questions
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Old 05-03-2014, 04:36 PM   #11
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Originally Posted by old_tx_kbb View Post
FYI - when doing big beers like this, you're not going to get 70% + efficiency. On my RIS brews, I'm lucky to get 60%...most of the time I'm looking at 55%...but that's with 100% all grain. You can always increase your OG with DME before you finish your boil.

While I would suggest underestimating efficiency, 70%+ isn't impossible. It just depends on how long you are willing to boil. I got just over 72%, but I sparged a good amount and boiled for 3 hours. Not everyone is going to want to do that. And if you are planning a parti-gyle brew I wouldn't suggest it, since the sparge will make up your smaller beer.
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Old 05-03-2014, 05:35 PM   #12
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Thank you for all of the great advice!

I'm pitching around 600billion based on the calculator I used. Called for super high gravity WLP099 but all they had was super San Diego WLP090, so I hope that will do the trick.

If not, has anyone ever pitched later into fermentation to help finish things up? I've heard of brewery's using champagne yeast on 20% plus brews on basic brewing radio. Could I pitch some wlp099 later or even champagne if this stalls out high?


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Old 05-03-2014, 06:01 PM   #13
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I've pitched later into fermentation on a few big ones (>15%). champagne isn't gunna do much if anything as there shouldnt be much simple sugars left and it struggles with the more complex ones. 099 will definitely get you lower if it ends up high, you'll want to pitch a starter of that while its krausened to get the most out of it. if you do end up over 1.12 you may need it, but otherwise you should be OK without. it's probably for the best that you got 090 for primary vs 099, its not the greatest for primary

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Old 05-03-2014, 06:36 PM   #14
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I've used 099 on a big% RIS. I had originally pitched an OG of 1.140 to a fresh yeast cake of 001. It worked itself down to 1.045 within a week with oxygen aeration and yeast nutrients. I added the 099 and within less than 24 hours it had come down to 1.020.

I immediately racked to secondary and put it in my freezer. At 30 degrees to put my yeast to sleep....left it there for a month and filtered it. Then racked it to my bourbon barrel.

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Old 05-03-2014, 10:23 PM   #15
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I scrapped the partigyle because as you all mentioned my efficiency was closer to 65%, I ran off 4g and started that boiling down in a second kettle. I kept topping up my main kettle to 7.5g from the other little kettle until I got to 1.090, the added 2 lbs of turbinado and got a reading of 1.100. If my math is good this should get me pretty close to my goal.

Thanks to all for the help, once again HBT came through, love this site.


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