weirdboy

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If I start my boil and am off by a lot, like 10 points or more, then I obviously missed something important during the mash and I will take steps to correct it during the boil, either by adding some DME or sugar to bump the gravity up, or adding water to dilute. And I will spend time figuring out what went wrong so that it doesn't happen again.

If I'm only off by a few points I just don't care.

ajf

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You're right that the numbers don't add up, but your math is correct, so there has to be something else going on.

Boiling 7.75g of 1.075 down to 6.5g should result in 1.089 (which I think you already know). Either your pre-boil or post-boil volumes or gravity readings must be incorrect assuming you took both readings from the kettle. I know the only way I can accurately measure the volume in the kettle is by weighing it with a scale. Did you mix up the wort sufficiently before taking the pre-boil reading? If not, and you took the sample from the bottom of the kettle, that could easily explain the shortage.

After adding 1.43# DME, I agree your gravity should have been 1.095. The only thing I can think of here is that either the DME was not completely dissolved, or that it was not sufficiently mixed with the wort.

Inadequate mixing would explain everyting, so that's what I am going to guess is most probable.

-a.

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JKoravos

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Did you account for wort contraction during chilling?

What was your final chilled wort volume?

Xiren

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Well, I do not know EXACTLY how much was left in my kettle, but I needed 5.5 gallons in my fermentor and that is what I got.

I checked volume after it was cool, 65*. However, my pre boil volume was checked at about 175*.

Looks like there are a lot of places I could of had my problem.

After adding the DME, I stirred the wort until it was all dissolved. Unless some was on the bottom of the kettle, but nothing was stuck to the bottom during clean up.

Guess, I need to make it again and REALLY take good notes of what I do and when.

Thank you everyone for helping.

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sudbuster

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All I can say is RAHAHB. Dude 1.090-1.095? The theoretical to the practical is a bridge. Really, how do you know that everything you have is in PERFECT calibration? How do you know the content of the DME? From some table somewhere? I think you did a GREAT job of what you were doing. Congradulate yourself and don't fret over split hairs.

JKoravos

Recipes 

Yup, it takes a little while to get a feel for what exactly the numbers mean depending on when you take them. You'll get it eventually.