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Old 07-10-2012, 12:04 AM   #1
Francis
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Default Grain crush - low efficiency

Yo! I brewed my 2nd AG beer this weekend (Pale Ale) and was super bummed with our efficiency. OG was 1.027 - well short of the 1.049 target. After reading how important grain crush is I think this was most likely the issue. I notice the grains seemed to be more together then previous brews but the hulls were cracked so I figured it was okay. How should they look after being properly crushed?

Here's the recipe/process

9 lbs 2-row pale
.375bs caramel 60L
.3125 Biscuit Malt

Mashed 153 degrees for 60 min with 3.3 gallons.
Batch Sparge 168 degrees for 10 min with 4.5 gallons.
6.5 gallons pre-boil - 5 gallons post.

How does that look?

I appreciate any tips!
Chris

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Old 07-10-2012, 12:18 AM   #2
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First off, if you crush at the store it's never a bad idea to run it through the mill twice IMO. That will likely increase the quality of your crush. Secondly, are those your notes from your session or your target temps and volumes? Obviously if your actual numbers were different you could have a difference but you were at about 40% efficiency.

How did this stack up to your 1st brew? Did you have similar problems?

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Old 07-10-2012, 12:23 AM   #3
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And also (and this is just like, my opinion man) if it's not to far along I personally would boil up some dry malt extract and dump it in there to at least bring the ABV up a bit. That for me is pretty light even for a light session beer.

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Old 07-10-2012, 12:41 AM   #4
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Yeah I'm going to pay a lot more attention to my grains in the future. Those were my targets but I was only a couple degrees over on my mash and right on for the sparge. First AG brew was an Apricot Blonde and it turned out great! Much better efficiency on that one.

We brewed on Saturday afternoon - how soon we I need to add the extra DME? The beer is in my buddy's basement because my house gets too hot in the summer. Might not be able to do it for a couple days.

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Old 07-10-2012, 01:53 AM   #5
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I might add some DME tomorrow or Weds. How much should I add?

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Old 07-10-2012, 02:57 AM   #6
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I use this link to determine how much DME to add when I come up short http://www.ahomebrewlog.com/gravity_adjustment/

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Old 07-10-2012, 03:35 AM   #7
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Cool - thanks man!

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Old 07-10-2012, 08:14 PM   #8
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How often did you stir your mash? what did you use to measure your gravities with? Even with a poor grain crush, 40% seems low. Seems to me the problem is multiple things - not just one thing.

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Old 07-10-2012, 08:20 PM   #9
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Quote:
Originally Posted by texasbrewer73 View Post
How often did you stir your mash? what did you use to measure your gravities with? Even with a poor grain crush, 40% seems low. Seems to me the problem is multiple things - not just one thing.
I agree. Could be dough-balls, could be lack of stirring before each vorlauf, could be error with scale used to weigh grain.
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Old 07-10-2012, 08:43 PM   #10
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I wouldn't blame the crush for efficiency problems. The anecdotal echo chamber holds that crush is critical to extract yield, but there's no evidence to back it up, other than anecdotal: http://www.homebrewtalk.com/f36/any-...-yield-326573/

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