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Home Brew Forums > Home Brewing Beer > Beginners Beer Brewing Forum > strangely high OG
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Old 06-23-2014, 01:58 PM   #1
iduncant
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Default strangely high OG

Hey everyone,

Fairly new to this and I have a quick question about something that happened. I was brewing a leffe clone from here http://www.homebrewtalk.com/f71/revv...-clone-202852/

It expects an OG of 1.068. Mine came out to 1.084. I followed the recipe to the letter and hit the mash temp +/- 2°.

Any idea why something like that could happen?

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Old 06-23-2014, 02:31 PM   #2
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Refractometer not calibrated or hydrometer reading not temperature corrected?

See line 16 of the legal disclaimer.

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Old 06-23-2014, 03:15 PM   #3
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I had the same issue the other day but with an extract kit. Looked like it was 1.082 and supposed to be 1.068. I attribute it to hitting the side of the "Thief" when I was reading it.

Anyone know of a 'skinny' hydrometer?

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Old 06-23-2014, 03:31 PM   #4
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Hydrometer was working fine on other batches, showing the correct readings. Plus the temperature correction raised my OG not lowered it.

I gave my hydrometer a tap and got the air bubbles off of it, made sure it was in the middle of the jar, the instrument was working fine.

Any suggestions on how this could have happened? Would you end up with more sugar if your grain was too finely crushed?

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Old 06-23-2014, 04:16 PM   #5
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What was the efficiency the recipe was predicated on? Many factors influence this including crush, water qualities, temperature, mash pH and lautering technique to name a few. Assuming your measurement is correct you simply extracted more from your grain than the recipe called for. Either that or you boiled down to a lower volume.
In the future, simply calculate the gravity as you run off your mash, and stop when you've collected the amount you want...


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Old 06-23-2014, 05:14 PM   #6
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Did you boil off too much wort by accident?

Did you fly sparge instead of batch sparge, and thus hit a higher efficiency then the recipe called for.

Did you happen to get a pre-boil OG?

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Old 06-23-2014, 05:21 PM   #7
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Is your thermometer for the mash properly calibrated?

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Old 06-23-2014, 05:23 PM   #8
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If the recipe was calculated at 70% efficiency and you achieved 80% efficiency plus boiled off a little bit too much water then this would easily explain the numbers.

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Old 06-23-2014, 07:48 PM   #9
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Best way to hit target OG is to work in "gravity points". It's sounds a bit complicated at first but is extremely easy to work with, especially for all grain brewers. Here's the way it works:
If target = 5 gallons of 1.050 wort
-subtract 1.0
-eliminate decimal places an multiply times gallons (50x5) to get 250 points.
-now just calculate as you go; let's say your first 2 gallons show 1.070
-that's 70x2 or 140 points.
-let's say the next 2 gallons dilute it down to 1.050
-that's 50x4 or 200 points
Let's say you know your boil off will be one gallon, so you want to collect 6 gallons. What gravity will 6 gallons have to be to hit 1.050 at 5 gallons?
-simple! 250 points DIVIDED by 6 gallons, (41.66) or 1.042
If you're under you can either collect more and boil off more, or add malt extract or other fermentable. If you're over you can add water and make a bigger batch, stop the sparge and add water, or make stronger beer. Either way, you're in control, not the author of the recipe...
PS, you can see the value of a refractometer here; many gravity samples are required...



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Old 06-24-2014, 02:54 AM   #10
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Quote:
Originally Posted by Balog View Post
Is your thermometer for the mash properly calibrated?
That's a very good point... the thermometer was included in a kit... the hydrometer was purchased from a specialty store.

I'll have to check that or just replace it with a better thermometer.
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