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Home Brew Forums > Home Brewing Beer > All Grain & Partial Mash Brewing > Low OG Again What am I doing wrong?
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Old 05-26-2011, 04:30 AM   #1
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Default Low OG Again What am I doing wrong?

Ok, this time I lowered my efficiency to 71% and adjusted my grain bill up to compensate and still only came up with 1.034 OG measured at 65 deg.
Mashed at 155 deg for one hour and did a mash out at 159 deg for 10 minutes.
Batch sparged at 165. Ended up with 6.2 gallons for a 5 gallon batch.

0.50 lb Rice Hulls (0.0 SRM) Adjunct 4.88 %
4.25 lb Pale Malt (2 Row) US (2.0 SRM) Grain 41.46 %
4.25 lb Wheat Malt, Bel (2.0 SRM) Grain 41.46 %
1.00 lb Munich Malt - 10L (10.0 SRM) Grain 9.76 %
0.25 lb Caramel/Crystal Malt - 40L (40.0 SRM) Grain 2.44 %
0.30 oz Warrior [15.00 %] (60 min) Hops 16.6 IBU
0.75 oz Cascade [5.50 %] (15 min) Hops 7.5 IBU
0.50 oz Williamette [5.50 %] (1 min) Hops 0.4 IBU
1 Pkgs American Hefeweizen Ale (White Labs #WLP320) Yeast-Wheat

I would sure like to get closer to the 1.042 pre boil mark.
Thanks

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Old 05-26-2011, 04:40 AM   #2
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First, have you recently calibrated your thermometers and hydrometer? If they're off even a little it can throw things off a lot. Inaccurate volume measurents can also make it seem like your efficiency is much worse than it is. How is your crush? Are you buying pre-milled grains or milling yourself? Are you stirring really really well at dough in to make sure there are no dough balls and then again before sparging? Could be any number of things, but we really need to know more about your process to pin it down.

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Old 05-26-2011, 04:51 AM   #3
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Quote:
Originally Posted by vindee View Post
Ok, this time I lowered my efficiency to 71% and adjusted my grain bill up to compensate and still only came up with 1.034 OG measured at 65 deg.
Mashed at 155 deg for one hour and did a mash out at 159 deg for 10 minutes.
Batch sparged at 165. Ended up with 6.2 gallons for a 5 gallon batch.

0.50 lb Rice Hulls (0.0 SRM) Adjunct 4.88 %
4.25 lb Pale Malt (2 Row) US (2.0 SRM) Grain 41.46 %
4.25 lb Wheat Malt, Bel (2.0 SRM) Grain 41.46 %
1.00 lb Munich Malt - 10L (10.0 SRM) Grain 9.76 %
0.25 lb Caramel/Crystal Malt - 40L (40.0 SRM) Grain 2.44 %
0.30 oz Warrior [15.00 %] (60 min) Hops 16.6 IBU
0.75 oz Cascade [5.50 %] (15 min) Hops 7.5 IBU
0.50 oz Williamette [5.50 %] (1 min) Hops 0.4 IBU
1 Pkgs American Hefeweizen Ale (White Labs #WLP320) Yeast-Wheat

I would sure like to get closer to the 1.042 pre boil mark.
Thanks
I've been hanging around 70% All Grain efficiency with 48 qt mash tun manifold setup with Keggle. In my opinion, I'd say add some more grain. The one I brewed last week had about 13 lbs total grain bill and I hit 1.052 on a nut brown. This week I did a Tank 7 Farmhouse Clone and hit 1.077 on a 15 lb grain Bill. Both 60 min mash at about 156. I do a hybrid type sparge with a colander @ 170 with a very very slow drain. About 1 hour to get my 6.75 gallon preboil. Another thing that may sound stupid but you never know, check the accuracy of your hydrometer using tap water.
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Old 05-26-2011, 04:51 AM   #4
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My hydrometer is accurate in plain water, and I am using a new digital temperature display with a Pl 385 RTD temp probe accurate at 32 degress and dead on at a boil at 212.4 deg.
I do stir and mix very well at dough in, once in the middle of mash, and again at mash out.
My grains are milled at the time I get the grains. The crush looks good to me, but that dosen't mean it's not correct.
Hope this helps

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Old 05-26-2011, 04:55 AM   #5
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Quote:
Originally Posted by vindee View Post
My hydrometer is accurate in plain water, and I am using a new digital temperature display with a Pl 385 RTD temp probe accurate at 32 degress and dead on at a boil at 212.4 deg.
I do stir and mix very well at dough in, once in the middle of mash, and again at mash out.
My grains are milled at the time I get the grains. The crush looks good to me, but that dosen't mean it's not correct.
Hope this helps
What type of mash tun do you have? Manifold or Braid?
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Old 05-26-2011, 05:01 AM   #6
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The mash tun is a 52 qt. Coleman extreme with a 1/2" copper pipe manifold setup with slits cut with a hacksaw every 1/2" along the bottom. (copyed from a design I found online)

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Old 05-26-2011, 05:03 AM   #7
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what does your crush look like? That's always the first thing I'd check if you're getting below 70%

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Old 05-26-2011, 12:48 PM   #8
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what does your crush look like? That's always the first thing I'd check if you're getting below 70%
How does crush affect efficiency?
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Old 05-26-2011, 01:41 PM   #9
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How does crush affect efficiency?
This was exactly my problem when I started all-grain. I was having the grain pre-crushed from an on-line source (thought it would save time); my efficiency was no where near what others in my club were getting from using the club's mill.

Too little milling means the grain remains in large pieces thus exposing less of the surface area of each (crushed) kernel to the wonderful warm water mash, thus extracting less. To much milling and of course you risk a stuck sparge. It is a narrow window, and somewhat dependent on your sparge equipment, that I think you just have to experiment around with to find the sweet spot.
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Old 05-26-2011, 01:53 PM   #10
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My efficiency has been low two just finished a batch of kolsch Last night at 1.040. Mashed at 149 batch spathe 160. Milling is good done at my lhbs this is the second all grain batch with a low efficiency

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