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Old 06-01-2014, 05:17 PM   #1
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Default BIAB methods and efficiency

After reading some posts about it, here's what I can tell. Sorry for this as not been tested on my side, apart sparging & squeezing. What do you think. Are these number rights?

Possible efficiency boost numbers
-

  • Double crush : 10-20% boost
  • 90 min mash : small to very little difference
  • Sparging (about the same vol. as the mash) : 5-10% boost
  • Squeezing : 1-5% boost
  • Mashout to 170° : 1-5% boost
  • Stirring the mash : small to very little difference

-

Edit 1 : added mashing-out to the list.
Edit 2 : added Stirring the mash to the list.
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Old 06-01-2014, 05:43 PM   #2
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I don't BIAB at the moment, although I have in the past. I personally found that a 90 minute mash improved my efficiency, adding about 5-10% additional extraction.

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Old 06-01-2014, 05:47 PM   #3
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Quote:
Originally Posted by Pie_Man View Post
I don't BIAB at the moment, although I have in the past. I personally found that a 90 minute mash improved my efficiency, adding about 5-10% additional extraction.
Thanks for your comments Pie_Man. I have read mixed feeling about 90 min mash. Some says it's not changing anything to efficiency, some says it does.

Can someone confirm what Pie_Man have just said?
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Old 06-01-2014, 06:43 PM   #4
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Keep in mind that time is just one extraction variable. Grain crush, grain bill, pH, water ratios, etc, can also factor into extraction.

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Old 06-01-2014, 11:31 PM   #5
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Quote:
Originally Posted by Pie_Man View Post
Keep in mind that time is just one extraction variable. Grain crush, grain bill, pH, water ratios, etc, can also factor into extraction.
Yes. This is just a ballpark.
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Old 06-02-2014, 03:50 PM   #6
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What does 'double-crush' mean? At what gap setting?

I think it's a mistake to publish numbers that appear to be predictions when there is no data to back them up. The best advice for every brewer is to try various changes, one at a time, and take good notes.

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Old 06-02-2014, 04:05 PM   #7
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Double crush usually refer to asking the LHBS to run it through their mill 2 times. When you have your own mill you can tighten the gap down and bust the grain almost to flour if that works for your bag. This is the number one factor for me.

Stirring the mash regularly also seems to make a difference.

Sparging can help as it rinses more sugars from the grains. However, you need to make sure to factor in your parge volume when calculating your brewing water.

Just my $0.02 but efficiency isn't nearly as important as being consistent. If you can get consistent then you know how much base malt you need to hit your numbers.

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Old 06-04-2014, 04:43 PM   #8
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Sorry, I wasn't clear--I understanding what double crushing is, but I was pointing out that it can be ambiguous. Not all double-crushes end up with the same results. It depends on the mill and it's settings.

In this way, it's difficult to generalize across brewing setups to predict a boost in efficiency from double-crushing. It's safe to say that it is one of the most common things to try if you find your efficiency lacking, but any predictions will be inaccurate.

The best thing to do is to keep everything else the same and try it on one's own system.

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Old 06-12-2014, 02:28 AM   #9
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Quote:
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In this way, it's difficult to generalize across brewing setups to predict a boost in efficiency from double-crushing. It's safe to say that it is one of the most common things to try if you find your efficiency lacking, but any predictions will be inaccurate.
Like I said.. just a ballpark.
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Old 06-13-2014, 11:54 PM   #10
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Stirring the mash I believe has the biggest effect on mash efficiency. Water:grain ratio probably second. 75 minute mash/watching the temps every 10-15 minutes is very important. I did 73% on two recent 15 lb batches by stirring and watching temps. I don't double crush or mash out. I remove the grains and that removes probably 97% of my mash fermentables.


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