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Old 11-03-2008, 10:09 PM   #1
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I have no idea why my eff is so low please critique what I have done and how is this going to affect my beer overall and abv.
Here is my grain bill for a mack and jacks all grain clone

9.81 british 2 row pale
1.15 crystal 80
1.15munich
.58 cara/pils
total grn bill 12.69

12.69x1.25=15.82qts or 3.96 gallons

I mashed 4gallons @ 155 for 60 min
to figure my sparge I took the equation
12.69 x.20(for absorption) and got 2.53 absorbed this wuoud leave about 1.4 of wort.i wanted 6.5 boil volume so I took 6.5-1.4 and sparged with 5.1 gallons.
I sparged with 2.5 @ 182 then sparged 2.5 @ 170. ( i read that if I split the sparge it would increase my efficency.
I ended up with 6.6 galons of wort preboil it is a 5.5gallon batch.
my og before boil is 1.045 and I used an online efficency calc and it told me my eff was 52.9%.
What the hell?
Why is it so low?
Can I expect my beer to be in the 4% volume range? it shoule be 5 or 6

I figured the recipe for 65 % b/c I brewed my first batch last week and got 66%

please help I am very frusterated

Thanks
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Old 11-03-2008, 10:13 PM   #2
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NOt enough sparge water.
I had this exact issue, and started to realize that if I had a grain bill of 9#'s or less, I was getting 75%+ and the more grain I used, the worse it got. I think if you were collecting closer to 9 gallons from that 12# of grain, you would be closer to the mid 70's
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Old 11-03-2008, 10:18 PM   #3
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Quote:
Originally Posted by BigKahuna View Post
NOt enough sparge water.
I had this exact issue, and started to realize that if I had a grain bill of 9#'s or less, I was getting 75%+ and the more grain I used, the worse it got. I think if you were collecting closer to 9 gallons from that 12# of grain, you would be closer to the mid 70's



Is there an acurate formula? Whoont that give me to much preboil volume throwing my 5.5 batch of beer off?
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Old 11-03-2008, 10:26 PM   #4
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Quote:
Originally Posted by bulldogxray View Post
Is there an acurate formula?
I hit chat and ask the masses.

Quote:
Originally Posted by bulldogxray View Post
won't that give me to much preboil volume throwing my 5.5 batch of beer off?
Boil till you get there! It's going to take longer than an hour...usually more like 90 minutes, but if you boil harder, you'll boil off faster.
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Old 11-03-2008, 10:26 PM   #5
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Quote:
Originally Posted by BigKahuna View Post
NOt enough sparge water.
I had this exact issue, and started to realize that if I had a grain bill of 9#'s or less, I was getting 75%+ and the more grain I used, the worse it got. I think if you were collecting closer to 9 gallons from that 12# of grain, you would be closer to the mid 70's
9 gallons, really? My last brew had an expected OG of 1.056, and I collected 7.4 gallons. The LAST runnings were at 1.008 (about the min. unless you want to start extracting alot of bad stuff). Now I also did a 90 moinute boil, and I had the exact same eff. as when I ran off 6.7 gallons and boiled for 60 minutes.

Basically, there is no point in running off more into the kettle than necessary. If you plan for a 90 minute boil, the pre-boil volume will probably put you at the MAX that you can run off, meaning anything more and there wont be enough sugar in it to matter at all.

If I collect 9 gallons, I would have to boil for 2 hours and 38 minutes to get down to 5.3 gallons!

 
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Old 11-03-2008, 10:33 PM   #6
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I sparge at about 1.5 qts/lb and get mid to high 80s efficiency for similar grain bills. You sparged at 1.67 qts/lb. I use the same temps for sparging as you, and also do a double/split batch sparge. Crushing my own grains helped my efficiency go from 55-65% range to 85-87%. How do you get yours crushed?

 
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Old 11-03-2008, 10:40 PM   #7
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Quote:
Originally Posted by JoMarky View Post
I sparge at about 1.5 qts/lb and get mid to high 80s efficiency for similar grain bills. You sparged at 1.67 qts/lb. I use the same temps for sparging as you, and also do a double/split batch sparge. Crushing my own grains helped my efficiency go from 55-65% range to 85-87%. How do you get yours crushed?
Guess??? my lhbs
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Old 11-03-2008, 10:41 PM   #8
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I just took a post boil sg and it was 1.060 How is that posible?
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Old 11-03-2008, 10:46 PM   #9
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Your preboil OG should be lower than your post boil. Youre concentrating the wort by boiling off a gallon of water..the same amount of sugars are now present in a smaller volume of water and therefore the gravity is higher.

My lhbs used to crush my grains too...now that I have control no grain goes uncrushed and the endosperms get pulverized.

 
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Old 11-03-2008, 10:49 PM   #10
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Quote:
Originally Posted by JoMarky View Post
Your preboil OG should be lower than your post boil. Youre concentrating the wort by boiling off a gallon of water..the same amount of sugars are now present in a smaller volume of water and therefore the gravity is higher.

My lhbs used to crush my grains too...now that I have control no grain goes uncrushed and the endosperms get pulverized.
I need to get a mill and do it my self.

With that sg my abv should be pretty goodright?
I was right in using my preboil sg for figuring my eff?
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