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Old 01-18-2010, 07:00 AM   #1
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Default wierd efficiency

I brewed a stout couple of days ago. After I sparged, I took a sample and my pre boil gravity reading was 1.032. I expected more, of course....

So I put it to boil, and after it boiled for 60 minutes, I chilled it and took a reading and it was 1.060

The water loss during boil was not high...

How is this possible?

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Old 01-18-2010, 07:24 AM   #2
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Did you adjust the hydrometer reading for temperature ? If it was hot it would have read lower.

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Old 01-18-2010, 07:37 AM   #3
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yes, you are right.

my wort was hot after sparging, and by the calculator instead of 1.032 it should have read 1.048...

now, is it possible that 1.048 raised to 1.060 after 60 minutes of boil?

I repeat that my water loss was not big. I probably lost 0.5 gal of water from the kettle

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Old 01-18-2010, 07:58 AM   #4
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I agree its odd. I'd understand 1.055 or so but 1.060 is a big change.

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Old 01-18-2010, 08:15 AM   #5
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After the boil I chilled the wort to 68 F and took a reading which was 1.060. So this reading should be fine, I guess the temperature was fine...

I wanted less ABV so I added 0.5 gallon of boiled water to already boiled wort and lowered 1.060 to 1.052

Do you think I made a mistake? Is this going to affect the final product?

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Old 01-18-2010, 08:25 AM   #6
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could be thinner gravity wort from the sparge sitting on higher gravity wort from the initial run off and you measured the lower gravity stuff then the action of the boil mixed it all together.
just a thought

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Old 01-18-2010, 09:25 AM   #7
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Quote:
Originally Posted by martinworswick View Post
could be thinner gravity wort from the sparge sitting on higher gravity wort from the initial run off and you measured the lower gravity stuff then the action of the boil mixed it all together.
just a thought
I suspect this is the most likely culprit, you must mix your preboil wolume well before grabbing your sample, and you should chill your sample to the temp your hydrometer is calibrated to get an accurate reading.
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Old 01-18-2010, 10:04 AM   #8
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I routinely get a 10 or so point increase from pre to post boil but I also have about a gallon of boil off on a three gallon batch and close to two gallons on a five gallon batch.

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Old 01-18-2010, 10:44 AM   #9
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do you think I made a mistake by adding some boiled water to wort after boiling to lower the efficiency from 1.060 to 1.052?

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Old 01-18-2010, 11:04 AM   #10
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I always take more than one pre boil reading on the wort. No matter how well I think I mixed it the first time, it's almost always higher on the second reading. No big deal if you're using a refractometer. It's something I would never have done with a hydrometer.

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