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Old 03-07-2011, 03:55 AM   #11
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Quote:
Originally Posted by AZ_IPA
what are you losing post-boil to ferementer? I don't know your process; so I'm not being critical....

But for me; I lose ~0.75 gallons from post-boil to fermenter; so it does have an effect on "efficiency"
I also lose about 3/4 gal to 1 gal.

I honestly don't care about efficiency in order to bring cost down. So I'm not bothered by losing a gallon of wort here and there. I just want perfect beer.
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Old 03-07-2011, 03:59 AM   #12
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I should have been more specific initially with my title: how to lower MASH efficiency.

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Old 03-07-2011, 04:02 AM   #13
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I should have been more specific initially with my title: how to lower MASH efficiency.
Okay - getting to the point...

Why would you want to lower your mash efficiency?
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Old 03-07-2011, 04:03 AM   #14
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Originally Posted by gnatp2 View Post
On calculating my efficiency, I hope this answers it:

I am calculating my efficiency by calculating my SG of my preboil wort and checking again postboil. I plug my grainbill and these numbers into BeerAlchemy to run my numbers.

Nate
Nate, You need to know exactly how much liquid volume you have at that time to get an accurate efficiency number. The 85% should apply at either pre-boil (mash efficiency) or Post boil (still mash efficiency, but at a different volume and concentration). BH efficiency isn't until you get into the fermenter and have an accurate volume and OG.
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Old 03-07-2011, 04:11 AM   #15
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Maybe a specific example will help:

8lb pilsner malt
1lb Vienna
4oz carapils

85% efficiency from beeralchemy gives 1.042 preboil for 7 gal and 1.049 postboil for 6 gallons ( I lose 1 gal during my boil)

When I do my SG test with preboil and postboil wort, I'm tying out with those numbers bang on.

Am I doing something wrong on that?

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Old 03-07-2011, 04:11 AM   #16
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Quote:
Originally Posted by AZ_IPA View Post
Okay - getting to the point...

Why would you want to lower your mash efficiency?
----Seems like he is worried about tannin extraction...

personally 80-85% is about right for a well tuned system. I'd just roll with it unless I was noticing tannin bitterness.

But the cheapest answer is this -- thin your Mash and use less sparge water. you will still run everything through the mash but you will leave more sugar behind.
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Old 03-07-2011, 04:13 AM   #17
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Quote:
Originally Posted by gnatp2 View Post
Maybe a specific example will help:

8lb pilsner malt
1lb Vienna
4oz carapils

85% efficiency from beeralchemy gives 1.042 preboil for 7 gal and 1.049 postboil for 6 gallons ( I lose 1 gal during my boil)

When I do my SG test with preboil and postboil wort, I'm tying out with those numbers bang on.

Am I doing something wrong on that?
No you're good. (as long as your volumes are accurate) See my previous post for the answer to your original question...
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Old 03-07-2011, 04:16 AM   #18
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Quote:
Originally Posted by AZ_IPA

Okay - getting to the point...

Why would you want to lower your mash efficiency?
Ive read that too high of an efficiency can extract tanins and other unwanted things in the wort.
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Old 03-07-2011, 04:23 AM   #19
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Quote:
Originally Posted by LakewoodBrew View Post
----Seems like he is worried about tannin extraction...

personally 80-85% is about right for a well tuned system. I'd just roll with it unless I was noticing tannin bitterness.

But the cheapest answer is this -- thin your Mash and use less sparge water. you will still run everything through the mash but you will leave more sugar behind.
Can you elaborate on this? Why would a thin mash ( more water/lb of grain) result in less efficiency? I would have thought the opposite.
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Old 03-07-2011, 04:44 AM   #20
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Should have asked but I'm assuming a fly sparge. If you are doing batch it likely won't have much effect at all.

In fly sparge the you are slowly reducing the sugar concentration from the top down. The longer you wash the more sugars you will get out. conversely a short sparge will yield poor sugar extraction. The mash thickness can effect conversion rates, but I'm simplifying the conversion process in the recommendation by saying, within a reasonable range, thick or thin you will get 100% conversion and you will get roughly the same sugar makeup.

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