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Old 10-09-2012, 12:22 AM   #971
FlyDoctor
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Quote:
Originally Posted by thughes View Post
We are experimenting with this at another BIAB website.

Here are results of my last two brews:

brew#1
15 minutes: 7.4 brix/1.0282 (mash temp 154F)
30 minutes: 7.8 brix/1.0298 (mash temp 154F)
45 minutes: 8.6 brix/1.0329 (mash temp 154F)
60 minutes: 10.0 brix/1.0384 (mash temp 152F)
75 minutes: 10.5 brix/1.0404 (mash temp 150F)
I then ramped temp up to mashout (168F) over 15 minutes:
90 minutes: 11.2 brix/1.0432 (mash temp 168F)
I let it sit at mashout temp for 15 minutes:
105 minutes: 11.4 brix/1.0440 (mash temp 167F)
Pull bag and squeeze:
pre-boil: 11.5 brix/1.0444 (mash temp N/A)

brew#2
60 minutes: 7.4 brix/1.0282 (mash temp 154F)
end of 90 minute mash: 7.8 brix/1.0298 (mash temp 154F)
end of 10 minute mashout (168F): 9.0 brix/1.0345
pre-boil (after pulling and squeezing bag): 9.2 brix/1.0353

*(brix converted to sg using Sean Terrill's calculator)


Granted this is a very limited data set but it appears that:

A) the extra 30 minutes in the mash does indeed result in more extraction/higher gravity

B) squeezing the crap out of the bag may not be worth the extra .0005 gravity point!
Nice work!

I'll add the extra grain to avoid the 30 extra minutes...but thats me. For me, the method is about simplicity in process, so a bit of extra grain to get the desired results on my system is worth it.



 
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Old 10-09-2012, 12:27 AM   #972
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Thanks. This is exactly why I disregard all the "common knowledge" that is repeated as gospel and actually experiment to determine real world results for myself (on my system, with my processes, etc).


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Old 10-09-2012, 12:28 AM   #973
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You'll also note that it appears the mashout gives me about .005 additional points.
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Old 10-09-2012, 01:04 AM   #974
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Quote:
Originally Posted by thughes View Post
We are experimenting with this at another BIAB website.



A) the extra 30 minutes in the mash does indeed result in more extraction/higher gravity

B) squeezing the crap out of the bag may not be worth the extra .0005 gravity point!

nice data. next brew could you check and see how it compares when you either add extra water up front to compensate for not squeezing or adding top up water. To me that would be a little more diluted than if you squeeze the bag to get the pre-boil volume. Of course that's just MY preferred method and nothing is written in stone here

 
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Old 10-09-2012, 03:38 AM   #975
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I'd like to know how much wort we are actually talking about in this "to squeeze or not to squeeze" question. Have you ever squeezed in a container separate from your boil pot and taken volume and gravity measurements? I haven't but am interested to know if we are talking about a pint, mabey 1.5 pints of 1.04 wort, or more like 2-3 quarts? If the case is 1-1.5 pints, would you continue squeezing or sacrifice the pint of wort for the saved time? I'd love to know the amount of grain used, the volume of squeezed wort and the gravity readings y'all come up with. I think this will help us put numbers with the question of weather to squeeze or not to squeeze...mabey

 
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Old 10-09-2012, 03:41 AM   #976
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I can squeeze 3-4 quarts...

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Old 10-09-2012, 07:09 AM   #977
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I do small batches. Grain weight rarely over 5 lbs. So when I squeeze well really I PRESS using to coffee cups w/bag in a collendar I get a lot of liquid. Will have to take some measurements later this week when I brew.
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Old 10-09-2012, 11:25 AM   #978
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Quote:
Originally Posted by MDHarris View Post
I'd like to know how much wort we are actually talking about in this "to squeeze or not to squeeze" question. Have you ever squeezed in a container separate from your boil pot and taken volume and gravity measurements? I haven't but am interested to know if we are talking about a pint, mabey 1.5 pints of 1.04 wort, or more like 2-3 quarts? If the case is 1-1.5 pints, would you continue squeezing or sacrifice the pint of wort for the saved time? I'd love to know the amount of grain used, the volume of squeezed wort and the gravity readings y'all come up with. I think this will help us put numbers with the question of weather to squeeze or not to squeeze...mabey
With a standard 5 gallon brew (12+ lbs grain & 8+ gallons of water), I hang the bag over the pot and squeeze to reclaim .75-1 gallon of wort. We're not talking trivial amounts, that's why I prefer to squeeze rather than use a bit of extra grain and/or top up with plain water (and throw away all that good wort!).
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Old 10-09-2012, 11:32 AM   #979
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My first AG brew I didn't add more grains, and I didn't do any sort of sparge(never do), I mashed for about 70 minutes then a 15 minute mashout. Did not squeeze the bag, just let drip into the kettle as it came up to boil and I got 78% efficiency!

 
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Old 10-09-2012, 05:32 PM   #980
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Quote:
Originally Posted by Mysticmead View Post
yes a partial boil makes a difference. if you can only do a 4 gal boil, make a smaller batch
Sorry, I didn't word that part of my question properly, what I meant to ask was, dose squeezing the bag makes any difference if you only do a partial boil, say 4 gal?

Your answer also brings another question to mind, if I were to BIAB a 5 gal recipe and mash it in 4 gal of water, can't I just top off to 5 gal in the fermenting bucket, with the same or close to the same gravity readings as mashing in 5 gal?

Or if its not the same, maybe adding some extra grain to compensate so I can top off?

Cheers


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