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Home Brew Forums > Home Brewing Beer > All Grain & Partial Mash Brewing > Where did all my sugars go???
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Old 02-04-2013, 01:02 AM   #11
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Based on you water volumes you should have had 73% efficiency. The mash temperature and time sounds fine, so my bet is on the crush.

I don't trust hydrometers when the temperature is more than 15 degrees from what I calibrated it at. Even with corrections.

4.1/6.5 = 63% first running efficiency
6.5-4.1 = 2.4 gallons grain absorption
2.7/(2.4+2.7) = 52.9% sparge efficiency
63%+27%*52.9%=73% total lautering efficiency


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Old 02-04-2013, 01:24 AM   #12
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Originally Posted by WoodlandBrew View Post
Based on you water volumes you should have had 73% efficiency. The mash temperature and time sounds fine, so my bet is on the crush.

I don't trust hydrometers when the temperature is more than 15 degrees from what I calibrated it at. Even with corrections.

4.1/6.5 = 63% first running efficiency
6.5-4.1 = 2.4 gallons grain absorbtion
2.7/(2.4+2.7) = 52.9% sparge efficiency
63%+27%*52.9%=73%
Huh? Care to explain that in a bit more detail? I agree with the temp corrections, As far as I have seen these are only for small variences over/under the calibrated value.


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Old 02-04-2013, 01:48 AM   #13
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I've got a blog post detailing it coming up, but in a nut shell, lautering efficiency is all about grain absorbtion. (and dead space if you have that problem)
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Old 02-04-2013, 01:55 AM   #14
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Originally Posted by billl View Post
#4 and #5 have nothing to do with sugars for DME or molasses though. Those are fixed numbers and aren't involve in the mash at all.

Next batch, you might just want to cool a sample instead of relying on correction charts. Something is amiss with your measurements, so you might want to start by taking out as many variables as possible. eg temp
Yeah, agreed. Went back and checked, and calculated if all the DME/mollases got into the fermenter I got a increase of only 12.5 not 16 (but that is still far away from the 6 he actually got).
I see where his question was around the DME/mollases now.
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Old 02-04-2013, 01:55 AM   #15
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I've got a blog post detailing it coming up, but in a nut shell, lautering efficiency is all about grain absorbtion. (and dead space if you have that problem)
Sweet as, had a look on you blog so that explains why I couldn't find anything
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Old 02-04-2013, 11:25 PM   #16
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I'll try to respond to several things at once here...

* Thanks for the tip on more water in the mash/sparging process. I knew that was going to be a problem going into it. I had anticipated 65%, but landed with 57%... lower than expected. The problem is that I only have an 8 gallon brew kettle, so 6.8 gallons is pretty much the max I can fit in while boiling. More water wouldn't have helped, although a better quantity balance between the two mashes would have been a good idea.. I suppose I could split the 1st runnings and second runnings into two separate kettles... hmmm.
* my boil-off rate is pretty low (.56 gal/hr) because my stove sucks. I boiled from 6.8 down to 5.5 gal over the course of a 140 min boil. It's about 10d outside right now in MN, but I have a propane burner ready to go come March.
* The efficiency ratings I was quoting are based on a different definition on assumptions, I think. I calculated the potential gravity from the grains mashed (~755 gp) and compared it to how much I was able to extract (~421 gp). There's my 57% eff from my mash.
* In the end, I'm not as concerned about the mash efficiency because I can attribute this to me being a rookie with AG and the fact that I was mashing a huge amount of grain for only a 5.5 gal batch. I think this will improve naturally over time.
* As for the gravity bump I was expecting from the 1.5 lbs of extra light DME and 6.2oz molasses... the sources I have cite the DME to be 44gp/gal (equiv. of 12 gp for a 5.5 gal batch) and molasses (equiv. of 2.5 gp). I guess I was off a little, but still... that should have bumped my 1.077 post-mash gravity up to 1.0915... not just 1.083... right?


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