Hit pre-boil SG right on, but real low on SG before adding yeast? - Home Brew Forums
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Old 06-02-2010, 03:01 PM   #1
robertvrabel
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What would be some reasons to hit pre-boil FG fine (All Grain), but end up low (like 6-7 points) on your SG before adding yeast? I'm trying to think of all the things that could cause this to pinpoint a problem I've had on the past 2 beers.

- Didn't loose enough in evaporation.
- Boil over (which did happen on one of the two beers)
- Not having the burner up higher? I keep it at a sweet spot so its boiling good but not to the point where it starts building up and I have to stir it every 1-2minute to stop a boil over. I used to do that but figured I was wasting propane.

 
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Old 06-02-2010, 03:10 PM   #2
Hammy71
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Sounds like you didn't boil off enough. A half gallon to much beer more than you anticipated can easily lower your OG by 5 points...... Either turn up the heat or better yet, collect less from your MLT next time.

 
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Old 06-02-2010, 04:09 PM   #3
pkeeler
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Or boil longer...

Some say that if you don't stir well, you can get incorrect OG readings. I take my OG readings after pitching the yeast and doing my shake & stir routine.

 
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Old 06-02-2010, 04:33 PM   #4
GRHunter
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+1 on not boiling off enough. Pre-boil & post-boil gravity is where a refractometer is your best friend.
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Old 06-02-2010, 06:36 PM   #5
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It could be you're not boiling it hard enough. For the first half you can boil lightly, but the last half of the boil you want a nice rolling boil. Both for evap and to drive off all the nasty nasties.

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Old 06-03-2010, 02:16 AM   #6
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and make sure you're correcting the temp for your hydrometer! but more than likely it's not boiled enough.
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Old 06-03-2010, 02:41 AM   #7
robertvrabel
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Yea you guys are right, its probably like .25-.5g extra of wort... which is why I'm getting a lower SG. I need to get a refractometer and take wort measurements throughout the boil so I can track that better. Its like the only part of the process I'm not confident in keeping consistent yet.

 
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Old 06-03-2010, 01:04 PM   #8
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I've found it's easier to err on the low side when making your preboil measurements. Boiling longer messes up my hop schedule. If my knotch on my spoon shows I'm a quart low at the end of my boil....I simply add a bottle of spring water. Hit the OG, spot on.

 
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